1
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Ruggieri S, Mizzoni S, Nardon C, Cavalli E, Sissa C, Anselmi M, Cozzi PG, Gualandi A, Sanadar M, Melchior A, Zinna F, Willis OG, Di Bari L, Piccinelli F. Circularly Polarized Luminescence from New Heteroleptic Eu(III) and Tb(III) Complexes. Inorg Chem 2023. [PMID: 37262334 DOI: 10.1021/acs.inorgchem.3c00196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The complexes [Eu(bpcd)(tta)], [Eu(bpcd)(Coum)], and [Tb(bpcd)(Coum)] [tta = 2-thenoyltrifluoroacetyl-acetonate, Coum = 3-acetyl-4-hydroxy-coumarin, and bpcd = N,N'-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane-N,N'-diacetate] have been synthesized and characterized from photophysical and thermodynamic points of view. The optical and chiroptical properties of these complexes, such as the total luminescence, decay curves of the Ln(III) luminescence, electronic circular dichroism, and circularly polarized luminescence, have been investigated. Interestingly, the number of coordinated solvent (methanol) molecules is sensitive to the nature of the metal ion. This number, estimated by spectroscopy, is >1 for Eu(III)-based complexes and <1 for Tb(III)-based complexes. A possible explanation for this behavior is provided via the study of the minimum energy structure obtained by density functional theory (DFT) calculations on the model complexes of the diamagnetic Y(III) and La(III) counterparts [Y(bpcd)(tta)], [Y(bpcd)(Coum)], and [La(bpcd)(Coum)]. By time-dependent DFT calculations, estimation of donor-acceptor (D-A) distances and of the energy position of the S1 and T1 ligand excited states involved in the antenna effect was possible. These data are useful for rationalizing the different sensitization efficiencies (ηsens) of the antennae toward Eu(III) and Tb(III). The tta ligand is an optimal antenna for sensitizing Eu(III) luminescence, while the Coum ligand sensitizes better Tb(III) luminescence {ϕovl = 55%; ηsens ≥ 55% for the [Tb(bpcd)(Coum)] complex}. Finally, for the [Eu(bpcd)(tta)] complex, a sizable value of glum (0.26) and a good quantum yield (26%) were measured.
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Affiliation(s)
- Silvia Ruggieri
- Luminescent Materials Laboratory, DB, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Silvia Mizzoni
- Luminescent Materials Laboratory, DB, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Chiara Nardon
- Luminescent Materials Laboratory, DB, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Enrico Cavalli
- Department of Chemistry, Life Sciences and Environmental Sustainability, Parma University, Parco Area delle Scienze, 17/a, 43124 Parma, Italy
| | - Cristina Sissa
- Department of Chemistry, Life Sciences and Environmental Sustainability, Parma University, Parco Area delle Scienze, 17/a, 43124 Parma, Italy
| | - Michele Anselmi
- Department of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Pier Giorgio Cozzi
- Department of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Andrea Gualandi
- Department of Chemistry "G. Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy
- Center for Chemical Catalysis - C3, Alma Mater Studiorum - Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Martina Sanadar
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, Università di Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, Università di Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Francesco Zinna
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Oliver G Willis
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Lorenzo Di Bari
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, DB, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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2
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Carneiro Neto AN, Moura RT, Carlos LD, Malta OL, Sanadar M, Melchior A, Kraka E, Ruggieri S, Bettinelli M, Piccinelli F. Dynamics of the Energy Transfer Process in Eu(III) Complexes Containing Polydentate Ligands Based on Pyridine, Quinoline, and Isoquinoline as Chromophoric Antennae. Inorg Chem 2022; 61:16333-16346. [PMID: 36201622 PMCID: PMC9580001 DOI: 10.1021/acs.inorgchem.2c02330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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In this work, we investigated from a theoretical point
of view
the dynamics of the energy transfer process from the ligand to Eu(III)
ion for 12 isomeric species originating from six different complexes
differing by nature of the ligand and the total charge. The cationic
complexes present the general formula [Eu(L)(H2O)2]+ (where L = bpcd2– = N,N′-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane N,N′-diacetate;
bQcd2– = N,N′-bis(2-quinolinmethyl)-trans-1,2-diaminocyclohexane N,N′-diacetate; and bisoQcd2– = N,N′-bis(2-isoquinolinmethyl)-trans-1,2-diaminocyclohexane N,N′-diacetate), while the neutral complexes present
the Eu(L)(H2O)2 formula (where L = PyC3A3– = N-picolyl-N,N′,N′-trans-1,2-cyclohexylenediaminetriacetate; QC3A3– = N-quinolyl-N,N′,N′-trans-1,2-cyclohexylenediaminetriacetate;
and isoQC3A3– = N-isoquinolyl-N,N′,N′-trans-1,2-cyclohexylenediaminetriacetate).
Time-dependent density functional theory (TD-DFT) calculations provided
the energy of the ligand excited donor states, distances between donor
and acceptor orbitals involved in the energy transfer mechanism (RL), spin-orbit coupling matrix elements, and
excited-state reorganization energies. The intramolecular energy transfer
(IET) rates for both singlet-triplet intersystem crossing and ligand-to-metal
(and vice versa) involving a multitude of ligand and Eu(III) levels
and the theoretical overall quantum yields (ϕovl)
were calculated (the latter for the first time without the introduction
of experimental parameters). This was achieved using a blend of DFT,
Judd–Ofelt theory, IET theory, and rate equation modeling.
Thanks to this study, for each isomeric species, the most efficient
IET process feeding the Eu(III) excited state, its related physical
mechanism (exchange interaction), and the reasons for a better or
worse overall energy transfer efficiency (ηsens)
in the different complexes were determined. The spectroscopically
measured ϕovl values are in good agreement with the
ones obtained theoretically in this work. Photophysical properties of 12 Eu(III)
complexes with pyridine,
quinoline, and isoquinoline ligands in aqueous solutions were elucidated
and predicted through a theoretical protocol using a blend of DFT,
Judd−Ofelt theory, intramolecular energy transfer theory, and
coupled rate equation modeling calculations. The theoretical procedure
is general and can be extended to any lanthanide-based complexes.
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Affiliation(s)
- Albano N Carneiro Neto
- Physics Department and CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193Aveiro, Portugal
| | - Renaldo T Moura
- Department of Chemistry and Physics, Federal University of Paraíba, 58397-000Areia, Brazil.,Department of Chemistry, Southern Methodist University, Dallas, Texas75275-0314, United States
| | - Luís D Carlos
- Physics Department and CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193Aveiro, Portugal
| | - Oscar L Malta
- Department of Fundamental Chemistry, Federal University of Pernambuco, 50740-560Recife, Brazil
| | - Martina Sanadar
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, University of Udine, 33100Udine, Italy
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, University of Udine, 33100Udine, Italy
| | - Elfi Kraka
- Department of Chemistry, Southern Methodist University, Dallas, Texas75275-0314, United States
| | - Silvia Ruggieri
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, 37134Verona, Italy
| | - Marco Bettinelli
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, 37134Verona, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, 37134Verona, Italy
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Piccinelli F, Sega D, Melchior A, Ruggieri S, Sanadar M, Varanini Z, Zamboni A. Regreening properties of the soil slow-mobile H 2bpcd/Fe 3+ complex: Steps forward to the development of a new environmentally friendly Fe fertilizer. Front Plant Sci 2022; 13:964088. [PMID: 35991452 PMCID: PMC9386293 DOI: 10.3389/fpls.2022.964088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 07/14/2022] [Indexed: 06/01/2023]
Abstract
The application of synthetic Fe-chelates stands for the most established agronomical practice to alleviate lime-induced chlorosis, which still constitutes a major agronomic problem. However, the percolation through the soil profile due to the negative charge of the most deployed molecules results in agronomical and environmental problems. H2bpcd/Fe3+ complex features distinctive chemical characteristics, including moderate stability of the Fe(bpcd)+ species (logβ ML = 20.86) and a total positive charge, and we studied its behavior in soil and regreening effects on cucumber plants. Soil column experiments have underlined that H2bpcd/Fe3+ is retained in more amounts than EDDHA/Fe3+. The new ligand was not proven to be toxic for the cucumber and maize seedlings. A concentration of 20 μM H2bpcd/Fe3+ attained regreening of Fe-deficient cucumber plants grown in the hydroponic solution supplied with CaCO3, similar to that shown by EDDHA/Fe3+. Experiments with a 2 μM concentration of 57Fe showed that cucumber roots absorbed H2bpcd/57Fe3+ at a slower rate than EDTA/57Fe3+. The high kinetic inertness of H2bpcd/Fe3+ may explain such behavior.
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Affiliation(s)
- Fabio Piccinelli
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Davide Sega
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura, University of Udine, Udine, Italy
| | - Silvia Ruggieri
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Martina Sanadar
- Dipartimento Politecnico di Ingegneria e Architettura, University of Udine, Udine, Italy
| | - Zeno Varanini
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Anita Zamboni
- Department of Biotechnology, University of Verona, Verona, Italy
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Cazzola E, Ruggeri S, Malachini M, Nardon C, Gorgoni G, Piccinelli F. Exploring bpcd ligand for theranostic radiopharmaceutical application. Nucl Med Biol 2022. [DOI: 10.1016/s0969-8051(22)00142-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Cavalli E, Nardon C, Willis OG, Zinna F, Di Bari L, Mizzoni S, Ruggieri S, Gaglio SC, Perduca M, Zaccone C, Romeo A, Piccinelli F. Near Infared Circularly Polarized Luminescence From Water Stable Organic Nanoparticles Containing a Chiral Yb(III) Complex. Chemistry 2022; 28:e202200574. [PMID: 35481882 PMCID: PMC9322261 DOI: 10.1002/chem.202200574] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Indexed: 01/05/2023]
Abstract
We report the first example of very efficient NIR Circularly Polarized Luminescence (CPL) (around 970 nm) in water, obtained thanks to the combined use of a chiral Yb complex and of poly lactic‐co‐glycolic acid (PLGA) nanoparticles. [YbL(tta)2]CH3COO (L=N, N’‐bis(2‐pyridylmethylidene)‐1,2‐(R,R+S,S) cyclohexanediamine and tta=2‐thenoyltrifluoroacetonate) shows good CPL in organic solvents, because the tta ligands efficiently sensitize Yb NIR luminescence and the readily prepared chiral ligand L endows the complex with the necessary dissymmetry. PLGA nanoparticles incorporate the complex and protect the metal ion from the intrusion of solvent molecules, while ensuring biocompatibility, water solubility and stability to the complex. Hydrophilic NIR‐CPL optical probes can find applications in the field of NIR‐CPL bio‐assays.
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Affiliation(s)
- Enrico Cavalli
- Department of Chemical Sciences, Life and Environmental Sustainability, Parma University, Parco Area delle Scienze, 11/a, 43124, Parma, Italy
| | - Chiara Nardon
- Luminescent Materials Laboratory, DB, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Oliver G Willis
- Department of Chemistry and Industrial Chemistry, Pisa University, via Moruzzi 13, 56124, Pisa, Italy
| | - Francesco Zinna
- Department of Chemistry and Industrial Chemistry, Pisa University, via Moruzzi 13, 56124, Pisa, Italy
| | - Lorenzo Di Bari
- Department of Chemistry and Industrial Chemistry, Pisa University, via Moruzzi 13, 56124, Pisa, Italy
| | - Silvia Mizzoni
- Luminescent Materials Laboratory, DB, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Silvia Ruggieri
- Luminescent Materials Laboratory, DB, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Salvatore C Gaglio
- Biocrystallography Lab, Department of Biotechnology, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Massimiliano Perduca
- Biocrystallography Lab, Department of Biotechnology, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Claudio Zaccone
- Department of Biotechnology, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Alessandro Romeo
- Department of Computer Science, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, DB, Verona University, Strada Le Grazie 15, 37134, Verona, Italy
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Piccinelli F, Nardon C, Bettinelli M, Melchior A, Tolazzi M, Zinna F, Di Bari L. Lanthanide‐Based Complexes Containing a Chiral
trans
‐1,2‐Diaminocyclohexane (DACH) Backbone: Spectroscopic Properties and Potential Applications. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202100143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Fabio Piccinelli
- Luminescent Materials Laboratory DB, University of Verona, and INSTM, UdR Verona Strada Le Grazie 15 37134 Verona Italy
| | - Chiara Nardon
- Luminescent Materials Laboratory DB, University of Verona, and INSTM, UdR Verona Strada Le Grazie 15 37134 Verona Italy
| | - Marco Bettinelli
- Luminescent Materials Laboratory DB, University of Verona, and INSTM, UdR Verona Strada Le Grazie 15 37134 Verona Italy
| | - Andrea Melchior
- Dipartimento Politecnico di ingegneria e architettura Laboratorio di Tecnologie Chimiche University of Udine Via Cotonificio 108 33100 Udine Italy
| | - Marilena Tolazzi
- Dipartimento Politecnico di ingegneria e architettura Laboratorio di Tecnologie Chimiche University of Udine Via Cotonificio 108 33100 Udine Italy
| | - Francesco Zinna
- Department of Chemistry and Industrial Chemistry Via Moruzzi 13 56124 Pisa Italy
| | - Lorenzo Di Bari
- Department of Chemistry and Industrial Chemistry Via Moruzzi 13 56124 Pisa Italy
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Piccinelli F, Carrasco I, Ma CG, Bettinelli M. Systematic Analysis of the Crystal Chemistry and Eu 3+ Spectroscopy along the Series of Double Perovskites Ca 2LnSbO 6 (Ln = La, Eu, Gd, Lu, and Y). Inorg Chem 2021; 60:8259-8266. [PMID: 34019423 PMCID: PMC8277163 DOI: 10.1021/acs.inorgchem.1c00932] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Eu3+ (1
mol %)-doped Ca2LnSbO6 (replacing Ln3+; Ln = Lu, Y, Gd, and La) and Ca2EuSbO6 were
synthesized and structurally characterized
by means of X-ray powder diffraction. The Eu3+ luminescence
spectroscopy of the doped samples and of Ca2EuSbO6 has been carefully investigated upon collection of the excitation/emission
spectra and luminescence decay curves of the main excited states.
Surprisingly, apart from the dominant red emission from 5D0, all the doped samples show an uncommon blue and green
emission contribution from 5DJ (J = 1, 2, and 3). This is made possible thanks
to both multiphonon and cross-relaxation mechanism inefficiencies.
However, the emission from 5D3 is more efficient
and the decay kinetics of the 5DJ (J = 0, 1, and 2) levels is slower in the case
of Y- and Lu-based doped samples. This evidence can find a possible
explanation in the crystal chemistry of this family of double perovskites:
our structural investigation suggests an uneven distribution of the
Eu3+ dopant ions in Ca2YSbO6 and
Ca2LuSbO6 hosts of the general A2BB′O6 formula. The luminescent center is mainly
located in the A crystal site, and on average, the Eu–Eu distances
are longer than in the case of the Gd- and La-based matrix. These
longer distances can further reduce the efficiency of the cross-relaxation
mechanism and, consequently, the radiative transitions are more efficient.
The slower depopulation of Eu3+ 5D2 and 5D1 levels in Ca2YSbO6 and
Ca2LuSbO6 hosts is reflected in the longer rise
observed in the 5D1 and 5D0 decay curves, respectively. Finally, in Ca2EuSbO6, the high Eu3+ concentration gives rise to an
efficient cross-relaxation within the subset of the lanthanide ions
so that no emission from 5DJ (J = 1, 2, and 3) is possible and the 5D0 decay kinetics is faster than for the doped samples. Eu3+ as a dopant ion in the
series of double
perovskite Ca2LnSbO6 (Ln = La, Gd, Y, and Lu)
hosts shows a different occupation of the available A and B crystal
sites; this strongly affects the luminescence behavior in the visible
spectral region.
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Affiliation(s)
- Fabio Piccinelli
- Luminescent Materials Laboratory, Department of Biotechnology, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, Verona 37134, Italy
| | - Irene Carrasco
- Département Microélectronique & Microcapteurs, Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, IETR-UMR 6164, Rennes F-35000, France
| | - Chong-Geng Ma
- CQUPT-BUL Innovation Institute, Chongqing University of Posts and Telecommunications, Chongqing 400065, P.R. China
| | - Marco Bettinelli
- Luminescent Materials Laboratory, Department of Biotechnology, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, Verona 37134, Italy
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8
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De Rosa C, Melchior A, Sanadar M, Tolazzi M, Duerkop A, Piccinelli F. Isoquinoline-based Eu(iii) luminescent probes for citrate sensing in complex matrix. Dalton Trans 2021; 50:4700-4712. [PMID: 33729252 DOI: 10.1039/d1dt00511a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A neutral Eu(iii) complex containing the S,S enantiomer of isoQC3A3- ligand (isoQC3A3- = N-isoquinolyl-N,N',N'-trans-l,2-cyclohexylenediaminetriacetate) was synthesized and characterized. The complex was spectroscopically investigated and the results compared with those obtained for the similar bis-anionic ligand bisoQcd2- (bisoQcd2- = N,N'-bis(2-isoquinolinmethyl)-trans-1,2-diaminocyclohexane N,N'-diacetate). Both Eu(iii)-complexes show similar binding constants upon titration with the main analytes contained in interstitial extracellular fluid (i.e. hydrogen carbonate, serum albumin and citrate). However, the analyte affinity is accompanied by different enhancements of the Eu(iii) intrinsic quantum yield (QY). Structures and hydration numbers of the complexes are determined by luminescence decay measurements and DFT calculations. The QYs as well as the binding constants of the individual adducts of the complexes with hydrogen carbonate, bovine serum albumin (BSA) and citrate are determined. The study of the Eu(iii) emission upon the systematic variation of one analyte in a complex mixture has been carried out to predict the performance of the luminescent sensor in conditions close to the real extracellular environment. Both Eu(iii) complexes can detect citrate at extracellular concentrations up to 500 μM, even at millimolar concentrations of the other interfering species. In the case of the Eu(bisoQcd)OTf complex, an increase of 23% of the Eu(iii) luminescence intensity at 615 nm upon addition of 0.3 mM of citrate was recorded. This feature makes the latter complex a viable probe for luminescence analysis of citrate in a complex matrix.
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Affiliation(s)
- Chiara De Rosa
- Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy.
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Gao C, Han Y, Zhang K, Wei T, Jiang Z, Wei Y, Yin L, Piccinelli F, Yao C, Xie X, Bettinelli M, Huang L. Templated-Construction of Hollow MoS 2 Architectures with Improved Photoresponses. Adv Sci (Weinh) 2020; 7:2002444. [PMID: 33240779 PMCID: PMC7675057 DOI: 10.1002/advs.202002444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/02/2020] [Indexed: 05/25/2023]
Abstract
Despite the outstanding optoelectronic properties of MoS2 and its analogues, synthesis of such materials with desired features including fewer layers, arbitrary hollow structures, and particularly specifically customized morphologies, via inorganic reactions has always been challenging. Herein, using predesigned lanthanide-doped upconversion luminescent materials (e.g., NaYF4:Ln) as templates, arbitrary MoS2 hollow structures with precisely defined morphologies, widely variable dimensions, and very small shell thickness (≈2.5 nm) are readily constructed. Most importantly, integration of the near-infrared-responsive template significantly improves the photoresponse of up to 600 fold in device made of NaYF4:Yb/Er@MoS2 compared with that of MoS2 nanosheets under 980 nm laser illumination. Multichannel optoelectronic device is further fabricated by simply changing luminescent ions in the template, e.g., NaYF4:Er@MoS2, operating at 1532 nm light excitation with a 276-fold photoresponse enhancement. The simple chemistry, easy operation, high reliability, variable morphologies, and wide universality represent the most important advantages of this novel strategy that has not been accessed before.
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Affiliation(s)
- Chao Gao
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
- School of Inspection and Testing CertificationChangzhou Vocational Institute of EngineeringChangzhou213164China
| | - Yingdong Han
- School of Precision Instruments and Optoelectronics EngineeringTianjin UniversityTianjin300072China
| | - Kun Zhang
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Tian Wei
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Zhang Jiang
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Yang Wei
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Lisha Yin
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Fabio Piccinelli
- Luminescent Materials LaboratoryDepartment of BiotechnologyUniversity of VeronaVerona37134Italy
| | - Cheng Yao
- School of Chemistry and Molecular EngineeringNanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Xiaoji Xie
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
| | - Marco Bettinelli
- Luminescent Materials LaboratoryDepartment of BiotechnologyUniversity of VeronaVerona37134Italy
| | - Ling Huang
- Institute of Advanced Materials (IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University30 South Puzhu RoadNanjing211816China
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De Rosa C, Melchior A, Sanadar M, Tolazzi M, Giorgetti A, Ribeiro RP, Nardon C, Piccinelli F. Effect of the Heteroaromatic Antenna on the Binding of Chiral Eu(III) Complexes to Bovine Serum Albumin. Inorg Chem 2020; 59:12564-12577. [PMID: 32806003 PMCID: PMC8009522 DOI: 10.1021/acs.inorgchem.0c01663] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The cationic enantiopure
(R,R) and luminescent Eu(III) complex [Eu(bisoQcd)(H2O)2] OTf (with bisoQcd = N,N′-bis(2-isoquinolinmethyl)-trans-1,2-diaminocyclohexane N,N′-diacetate and OTf = triflate) was synthesized
and characterized. At physiological pH, the 1:1 [Eu(bisoQcd)(H2O)2]+ species, possessing
two water molecules in the inner coordination sphere, is largely dominant.
The interaction with bovine serum albumin (BSA) was studied by means
of several experimental techniques, such as luminescence spectroscopy,
isothermal titration calorimetry (ITC), molecular docking (MD), and
molecular dynamics simulations (MDS). In this direction, a ligand
competition study was also performed by using three clinically established
drugs (i.e., ibuprofen, warfarin, and digitoxin). The nature of this
interaction is strongly affected by the type of the involved heteroaromatic
antenna in the Eu(III) complexes. In fact, the presence of isoquinoline rings drives the corresponding complex toward
the protein superficial area containing the tryptophan residue 134
(Trp134). As the main consequence, the metal center undergoes the
loss of one water molecule upon interaction with the side chain of
a glutamic acid residue. On the other hand, the similar complex containing
pyridine rings ([Eu(bpcd)(H2O)2]Cl with bpcd
= N,N′-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane N,N′-diacetate) interacts more weakly with the protein
in a different superficial cavity, without losing the coordinated
water molecules. The effect
of the antenna moiety on the interaction of two new luminescent Eu(III)
complexes with BSA was studied. Results show that the complexes can
be conveniently exploited as optical probes for albumin serum proteins
by means of opposite mechanisms (switch-on−off of the luminescent
signal).
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Affiliation(s)
- Chiara De Rosa
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM - UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Andrea Melchior
- Laboratory of Chemical Technologies, Polytechnic Department of Engineering and Architecture, University of Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Martina Sanadar
- Laboratory of Chemical Technologies, Polytechnic Department of Engineering and Architecture, University of Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Marilena Tolazzi
- Laboratory of Chemical Technologies, Polytechnic Department of Engineering and Architecture, University of Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Alejandro Giorgetti
- Applied Bioinformatics Laboratory, Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Rui P Ribeiro
- Applied Bioinformatics Laboratory, Department of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Chiara Nardon
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM - UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM - UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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11
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Cagini C, Riccitelli F, Messina M, Piccinelli F, Torroni G, Said D, Al Maazmi A, Dua HS. Epi-off-lenticule-on corneal collagen cross-linking in thin keratoconic corneas. Int Ophthalmol 2020; 40:3403-3412. [PMID: 32794082 PMCID: PMC7669785 DOI: 10.1007/s10792-020-01526-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 07/20/2020] [Indexed: 11/26/2022]
Abstract
Purpose To evaluate the safety and efficacy of corneal collagen cross-linking (CXL) performed on overlaying a corneal lenticule to thin recipient corneas of progressive keratoconus (KC) patients. Methods In this study were enrolled eyes of patients affected by progressive KC with a minimum corneal thickness less than 400 µm, after overlaying a lenticule of human corneal stroma prepared with the femtosecond laser. The lenticules used were 100 µm thick and of 8.5 mm diameter in all the cases. Both the host cornea and the lenticules were subjected to epithelial debridement. CXL was carried out according to the standard protocol. Visual acuity, refraction, slit-lamp examination, endothelial cell density, pachymetry and keratometry, anterior segment tomography (AS-OCT) and confocal microscopy were evaluated preoperatively and at 1, 3, 6 and 12 months postoperatively. Results CXL was performed in 10 eyes of 8 patients (main age 23), corneal thickness range 379–414 µm, mean 387.6 µm. One patient was lost at follow-up. In all other cases, visual acuity and the endothelial cell density remained stable over a 12-month follow-up. Preoperative mean K1 and mean K2 were 46.91 ± 1.9 and 50.75 ± 2.93, respectively, and at 12 months mean K1 was 47.36 ± 2.66 and mean K2 50.53 ± 3.35. The AS-OCT clearly showed a demarcation line in all patients at 1, 3 (mean depth 283 µm and 267 µm, respectively) and in some cases at 6 months. Reduced keratocyte density and stromal oedema were observed immediately up to 1 month after treatment, while a slight subepithelial haze was present at 1-month and completely disappeared by 6 months. Conclusion This new technique seems to offer a therapeutic opportunity for young patients suffering from progressive KC with very thin corneas, in which the standard treatment is not indicate, and delay or avoid the need for a corneal transplant.
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Affiliation(s)
- Carlo Cagini
- Department of Biomedical and Surgical Sciences, Ophthalmology Section, University of Perugia, Perugia, Italy.
| | - F Riccitelli
- Department of Biomedical and Surgical Sciences, Ophthalmology Section, University of Perugia, Perugia, Italy
| | - M Messina
- Department of Biomedical and Surgical Sciences, Ophthalmology Section, University of Perugia, Perugia, Italy
| | - F Piccinelli
- Department of Biomedical and Surgical Sciences, Ophthalmology Section, University of Perugia, Perugia, Italy
| | - G Torroni
- Department of Biomedical and Surgical Sciences, Ophthalmology Section, University of Perugia, Perugia, Italy
| | - D Said
- Larry A Donoso Laboratory for Eye Research, Division of Clinical Neuroscience, Academic Section of Ophthalmology, University of Nottingham, Nottingham, UK
| | - A Al Maazmi
- Larry A Donoso Laboratory for Eye Research, Division of Clinical Neuroscience, Academic Section of Ophthalmology, University of Nottingham, Nottingham, UK
| | - H S Dua
- Larry A Donoso Laboratory for Eye Research, Division of Clinical Neuroscience, Academic Section of Ophthalmology, University of Nottingham, Nottingham, UK
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Piccinelli F, Bettinelli M, Cano J, Lloret F, Julve M, Dolmella A. Magnetic Properties of a New Hexahalorhenate(IV) Compound and Structural Comparison with Its Hexahaloplatinate(IV) Analog. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fabio Piccinelli
- Luminescent Materials Laboratory, DB Università di Verona, and INSTM, UdR Verona Strada Le Grazie 15 37134 Verona Italy
| | - Marco Bettinelli
- Luminescent Materials Laboratory, DB Università di Verona, and INSTM, UdR Verona Strada Le Grazie 15 37134 Verona Italy
| | - Joan Cano
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica Universitat de València C/ Catedrátco José Beltrán 2 46980 Paterna València Spain
| | - Francesc Lloret
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica Universitat de València C/ Catedrátco José Beltrán 2 46980 Paterna València Spain
| | - Miguel Julve
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica Universitat de València C/ Catedrátco José Beltrán 2 46980 Paterna València Spain
| | - Alessandro Dolmella
- Department of Pharmaceutical and Pharmacological Sciences University of Padova via F. Marzolo 5 35131 Padova Italy
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Piccinelli F, Paterlini V, Monari M, Bettinelli M. Sensitivity of a solid Eu(III) complex towards acetonitrile vapor: Structural and spectroscopic characterization. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2020.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Arrico L, De Rosa C, Di Bari L, Melchior A, Piccinelli F. Effect of the Counterion on Circularly Polarized Luminescence of Europium(III) and Samarium(III) Complexes. Inorg Chem 2020; 59:5050-5062. [PMID: 32186182 PMCID: PMC7997384 DOI: 10.1021/acs.inorgchem.0c00280] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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Each enantiopure
europium(III) and samarium(III) nitrate and triflate
complex of the ligand L, with L = N,N′-bis(2-pyridylmethylidene)-1,2-(R,R + S,S)-cyclohexanediamine ([LnL(tta)2]·NO3 and [LnL(tta)2(H2O)]·CF3SO3, where tta = 2-thenoyltrifluoroacetylacetonate)
has been synthesized and characterized from a spectroscopic point
of view, using a chiroptical technique such as electronic circular
dichroism (ECD) and circularly polarized luminescence (CPL). In all
cases, both ligands are capable of sensitizing the luminescence of
both metal ions upon absorption of light around 280 and 350 nm. Despite
small differences in the total luminescence (TL) and ECD spectra,
the CPL activity of the complexes is strongly influenced by a concurrent
effect of the solvent and counterion. This particularly applies to
europium(III) complexes where the CPL spectra in acetonitrile can
be described as a weighed linear combination of the CPL spectra in
dichloromethane and methanol, which show nearly opposite signatures
when their ligand stereochemistries are the same. This phenomenon
could be related to the presence of equilibria interconverting solvated,
anion-coordinated complexes and isomers differing by the relative
orientation of the tta ligands. The difference between some bond lengths
(M–N bonds, in particular) in the different species could be
at the basis of such an unusual CPL activity. Triflate ([EuL(tta)2(H2O)]·CF3SO3) and nitrate ([EuL(tta)2]·NO3) complexes, with L = N,N′-bis(2-pyridylmethylidene)-1,2-(R,R or S,S)-cyclohexanediamine, where tta = 2-thenoyltrifluoroacetylacetonate,
show nearly opposite circularly polarized luminescence (CPL) signatures
when dissolved in dichloromethane (DCM) or methanol (MeOH), even though
their ligand stereochemistries remain unchanged. The presence (in
DCM) and absence (in MeOH) of the counterion in the inner coordination
sphere determine a strong change of the CPL activity of the relative
europium(III) complex.
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Affiliation(s)
- Lorenzo Arrico
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Chiara De Rosa
- Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, University of Verona Research Unit, Strada Le Grazie 15, 37134 Verona, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Andrea Melchior
- Laboratorio di Tecnologie Chimiche, Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine, via Cotonificio 108, 33100 Udine, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, University of Verona Research Unit, Strada Le Grazie 15, 37134 Verona, Italy
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Piccinelli F, Rosa CD, Lazarowska A, Mahlik S, Grinberg M, Nakanishi T, Omagari S, Bettinelli M. Optical properties of Eu(III) and Tb(III) complexes with pyridine- and quinoline- based ligands under high hydrostatic pressure. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Piccinelli F, De Rosa C, Melchior A, Faura G, Tolazzi M, Bettinelli M. Eu(iii) and Tb(iii) complexes of 6-fold coordinating ligands showing high affinity for the hydrogen carbonate ion: a spectroscopic and thermodynamic study. Dalton Trans 2019; 48:1202-1216. [PMID: 30460363 DOI: 10.1039/c8dt03621g] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In the present contribution, four classes of Ln(iii) complexes (Ln = Eu and Tb) have been synthesized and characterized in aqueous solution. They differ by charge, Ln(bpcd)+ [bpcd2- = N,N'-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane N,N'-diacetate] and Ln(bQcd)+ (bQcd2- = N,N'-bis(2-quinolinmethyl)-trans-1,2-diaminocyclohexane N,N'-diacetate) being positively charged and Ln(PyC3A) (PyC3A3- = N-picolyl-N,N',N'-trans-l,2-cyclohexylenediaminetriacetate) and Ln(QC3A) (QC3A3- = N-quinolyl-N,N',N'-trans-l,2-cyclohexylenediaminetriacetate) being neutral. Combined DFT, spectrophotometric and potentiometric studies reveal the presence, under physiological conditions (pH 7.4), of a couple of equally and highly stable isomers differing by the stereochemistry of the ligands (trans-N,N and trans-O,O for bpcd2- and bQcd2-; trans-O,O and trans-N,O for PyC3A3- and QC3A3-). Their high log β values (9.97 < log β < 15.68), the presence of an efficient antenna effect and the strong increase of the Ln(iii) luminescence intensity as a function of the hydrogen carbonate concentration in physiological solution, render these complexes as very promising optical probes for a selective detection of HCO3-in cellulo or in extracellular fluid. This particularly applies to the cationic Eu(bpcd)+, Tb(bpcd)+ and Eu(bQcd)+ complexes, which are capable of guesting up to two hydrogen carbonate anions in the inner coordination sphere of the metal ion, so that they show an unprecedented affinity towards HCO3- (log K for the formation of the adduct in the 4.6-5.9 range).
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Affiliation(s)
- Fabio Piccinelli
- Laboratorio Materiali Luminescenti, DB, Università di Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy.
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Amabili P, Amici A, Campisi G, Guerra G, Monari M, Orena M, Piccinelli F, Rinaldi S, Tolomelli A. Synthesis of Enantiopure Isosteres of Amino Acids Containing a Quaternary Stereocenter: Experimental and Computational Evaluation of a Novel Class of Atropisomers. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801213] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Paolo Amabili
- Department Di.S.V.A.; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Adolfo Amici
- Department of Odontostomatologic and Specialized Clinical Sciences; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Giovanni Campisi
- Department Di.S.V.A.; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Giulia Guerra
- Department Di.S.V.A.; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Magda Monari
- Department of Chemistry “G.Ciamician”; Alma Mater Studiorum University of Bologna; Via Selmi 2 40126 Bologna Italy
| | - Mario Orena
- Department Di.S.V.A.; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory; Department of Biotechnology; University of Verona; Strada Le Grazie 15 37134 Verona Italy
| | - Samuele Rinaldi
- Department Di.S.V.A.; Polytechnic University of Marche; Via Brecce Bianche 60131 Ancona Italy
| | - Alessandra Tolomelli
- Department of Chemistry “G.Ciamician”; Alma Mater Studiorum University of Bologna; Via Selmi 2 40126 Bologna Italy
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18
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Leonzio M, Bettinelli M, Arrico L, Monari M, Di Bari L, Piccinelli F. Circularly Polarized Luminescence from an Eu(III) Complex Based on 2-Thenoyltrifluoroacetyl-acetonate and a Tetradentate Chiral Ligand. Inorg Chem 2018; 57:10257-10264. [DOI: 10.1021/acs.inorgchem.8b01480] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Marco Leonzio
- Laboratorio Materiali Luminescenti, DB, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Marco Bettinelli
- Laboratorio Materiali Luminescenti, DB, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Lorenzo Arrico
- Dipartimento di Chimica e Chimica Industriale, via Moruzzi 13, 56124 Pisa, Italy
| | - Magda Monari
- Dipartimento di Chimica ‘‘G. Ciamician’’, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, via Moruzzi 13, 56124 Pisa, Italy
| | - Fabio Piccinelli
- Laboratorio Materiali Luminescenti, DB, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Piccinelli F, Carrasco I, Ma CG, Srivastava AM, Bettinelli M. Disorder-Induced Breaking of the Local Inversion Symmetry in Rhombohedral Pyrochlores M2La3Sb3O14 (M = Mg or Ca): A Structural and Spectroscopic Investigation. Inorg Chem 2018; 57:9241-9250. [DOI: 10.1021/acs.inorgchem.8b01261] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabio Piccinelli
- Luminescent Materials Laboratory, DB and INSTM, UdR Verona, Università di Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Irene Carrasco
- Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - Chong-Geng Ma
- Luminescent Materials Laboratory, DB and INSTM, UdR Verona, Università di Verona, Strada Le Grazie 15, 37134 Verona, Italy
- College of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China
| | - Alok M. Srivastava
- GE Global Research, One Research Circle, Niskayuna, New York 12309, United States
| | - Marco Bettinelli
- Luminescent Materials Laboratory, DB and INSTM, UdR Verona, Università di Verona, Strada Le Grazie 15, 37134 Verona, Italy
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Leonzio M, Melchior A, Faura G, Tolazzi M, Bettinelli M, Zinna F, Arrico L, Di Bari L, Piccinelli F. A chiral lactate reporter based on total and circularly polarized Tb(iii) luminescence. NEW J CHEM 2018. [DOI: 10.1039/c7nj04640e] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Lactate anion signaling by a chiral Tb(iii) complex based on total and circularly polarized luminescence.
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Affiliation(s)
- Marco Leonzio
- Luminescent Materials Laboratory
- DB
- Università di Verona, and INSTM
- UdR Verona
- 37134 Verona
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura
- Laboratorio di Tecnologie Chimiche
- Università di Udine
- 33100 Udine
- Italy
| | - Georgina Faura
- Dipartimento Politecnico di Ingegneria e Architettura
- Laboratorio di Tecnologie Chimiche
- Università di Udine
- 33100 Udine
- Italy
| | - Marilena Tolazzi
- Dipartimento Politecnico di Ingegneria e Architettura
- Laboratorio di Tecnologie Chimiche
- Università di Udine
- 33100 Udine
- Italy
| | - Marco Bettinelli
- Luminescent Materials Laboratory
- DB
- Università di Verona, and INSTM
- UdR Verona
- 37134 Verona
| | - Francesco Zinna
- Dipartimento di Chimica e Chimica Industriale
- 56124 Pisa
- Italy
| | - Lorenzo Arrico
- Dipartimento di Chimica e Chimica Industriale
- 56124 Pisa
- Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale
- 56124 Pisa
- Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory
- DB
- Università di Verona, and INSTM
- UdR Verona
- 37134 Verona
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Biancalana L, Tuci G, Piccinelli F, Marchetti F, Bortoluzzi M, Pampaloni G. Vanadium(v) oxoanions in basic water solution: a simple oxidative system for the one pot selective conversion of l-proline to pyrroline-2-carboxylate. Dalton Trans 2017; 46:15059-15069. [PMID: 29063086 DOI: 10.1039/c7dt02702h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unprecedented, direct chemical oxidation of l-proline to pyrroline-2-carboxylate was achieved in water (pH 9-10) by means of NH4VO3/NH3 or V2O5/MOH (K = Na, K), and the anion was fully characterized as ammonium or alkaline metal salts. Quantitative yield and higher atom economy performance were achieved with the latter system, the alkaline salts being more stable than the ammonium one. Different mixed valence V(iv)/V(v) compounds precipitated from the reaction mixtures depending on the nature of the employed base. A possible reaction mechanism is proposed according to DFT calculations. The analogous reaction of trans-4-hydroxy-l-proline with NH4VO3/NH3 afforded pyrrole-2-carboxylic acid in 81% yield, while sarcosine underwent prevalent decomposition under similar experimental conditions. Instead, no reaction was observed with primary (glycine, l-alanine, l-phenylalanine) and tertiary α-amino acids (N,N-dimethyl-l-phenylalanine, N,N-dimethylglycine).
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Affiliation(s)
- Lorenzo Biancalana
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
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Leonzio M, Melchior A, Faura G, Tolazzi M, Zinna F, Di Bari L, Piccinelli F. Strongly Circularly Polarized Emission from Water-Soluble Eu(III)- and Tb(III)-Based Complexes: A Structural and Spectroscopic Study. Inorg Chem 2017; 56:4413-4422. [PMID: 28388073 DOI: 10.1021/acs.inorgchem.7b00430] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Water-soluble Eu(III) and Tb(III) complexes with N,N'-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane-N,N'-diacetic acid (H2bpcd) have been synthesized and characterized in their racemic and enantiopure forms. The ligand has been designed to bind Ln(III) ions, providing a dissymmetric environment able to solicit strong chiroptical features while at the same time leaving a few coordination sites available for engaging further ancillary ligands. Potentiometric studies show that Ln(III) complexes have a relatively good stability and that at pH 7 the [Ln(bpcd)]+ species is largely dominant. DFT calculations carried out on the (S,S)-[Y(bpcd)(H2O)5]+ complexes (the closed-shell equivalents of [Eu(bpcd)(H2O)5]+ and [Tb(bpcd)(H2O)5]+) indicate that the two trans-O,O and trans-Npy,Npy configurations are equally stable in solution and present two coordinated water molecules. This is in agreement with the hydration number ∼2.6 determined by luminescence lifetime measurements on Tb(III) and Eu(III) complexes. A detailed optical and chiroptical spectroscopic characterization has been carried out and reveals that the complexes display an efficient luminescence in the visible spectral range accompanied by a strong CPL activity. A value for glum (around 0.1 on the top of the 546 nm band) for the Tb-based complex has been found. This is one of the highest glum values measured up to now for chiral Tb complexes. These results suggest that in principle Tb(bpcd)Cl is suitable to be employed as a CPL bioprobe for relevant analytes in aqueous media.
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Affiliation(s)
- Marco Leonzio
- Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona , Strada Le Grazie 15, 37134 Verona, Italy
| | - Andrea Melchior
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, Università di Udine , via Cotonificio 108, 33100 Udine, Italy
| | - Georgina Faura
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, Università di Udine , via Cotonificio 108, 33100 Udine, Italy
| | - Marilena Tolazzi
- Dipartimento Politecnico di Ingegneria e Architettura, Laboratorio di Tecnologie Chimiche, Università di Udine , via Cotonificio 108, 33100 Udine, Italy
| | - Francesco Zinna
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Moruzzi 13, 56124 Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa , via Moruzzi 13, 56124 Pisa, Italy
| | - Fabio Piccinelli
- Luminescent Materials Laboratory, DB, Università di Verona, and INSTM, UdR Verona , Strada Le Grazie 15, 37134 Verona, Italy
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Piccinelli F, Leonzio M, Bettinelli M, Melchior A, Faura G, Tolazzi M. Luminescent Eu3+ complexes in acetonitrile solution: Anion sensing and effect of water on the speciation. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.09.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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24
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Mihorianu M, Leonzio M, Monari M, Ravotto L, Ceroni P, Bettinelli M, Piccinelli F. Structural and Spectroscopic Properties of New Chiral Quinoline-based Ln(III) Complexes. ChemistrySelect 2016. [DOI: 10.1002/slct.201600641] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Monica Mihorianu
- Department of Biotechnology,Luminescent Materials Laboratory; University of Verona and INSTM, UdR Verona; Strada Le Grazie 15 37134 Verona Italy
| | - Marco Leonzio
- Department of Biotechnology,Luminescent Materials Laboratory; University of Verona and INSTM, UdR Verona; Strada Le Grazie 15 37134 Verona Italy
| | - Magda Monari
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi 2 40126 Bologna Italy
| | - Luca Ravotto
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi 2 40126 Bologna Italy
| | - Paola Ceroni
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi 2 40126 Bologna Italy
| | - Marco Bettinelli
- Department of Biotechnology,Luminescent Materials Laboratory; University of Verona and INSTM, UdR Verona; Strada Le Grazie 15 37134 Verona Italy
- INSTM; UdR Verona; Strada Le Grazie 15 37134 Verona Italy
| | - Fabio Piccinelli
- Department of Biotechnology,Luminescent Materials Laboratory; University of Verona and INSTM, UdR Verona; Strada Le Grazie 15 37134 Verona Italy
- INSTM; UdR Verona; Strada Le Grazie 15 37134 Verona Italy
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25
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Evangelisti C, Hayatifar M, Marchetti F, Marelli M, Pampaloni G, Piccinelli F. Synthesis of Nanocrystalline TiOF2 Embedded in a Carbonaceous Matrix from TiF4 and d-Fructose. Inorg Chem 2016; 55:1816-20. [DOI: 10.1021/acs.inorgchem.5b02715] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Claudio Evangelisti
- Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR), Via G. Fantoli 16/15, I-20138 Milano, Italy
| | - Mohammad Hayatifar
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi
13, I-56124 Pisa, Italy
| | - Fabio Marchetti
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi
13, I-56124 Pisa, Italy
| | - Marcello Marelli
- Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR), Via G. Fantoli 16/15, I-20138 Milano, Italy
| | - Guido Pampaloni
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi
13, I-56124 Pisa, Italy
| | - Fabio Piccinelli
- Laboratorio
di Chimica dello Stato Solido, Dipartimento di Biotecnologie, Università di Verona, Strada Le Grazie 15, I-37134 Verona, Italy
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26
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Bortoluzzi M, Evangelisti C, Marchetti F, Pampaloni G, Piccinelli F, Zacchini S. Synthesis of a highly reactive form of WO2Cl2, its conversion into nanocrystalline mono-hydrated WO3 and coordination compounds with tetramethylurea. Dalton Trans 2016; 45:15342-15349. [DOI: 10.1039/c6dt02997c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A new form of WO2Cl2 was prepared from WCl6. Conversion of WO2Cl2 into nanocrystalline WO3·H2O occurred upon air exposure at room temperature. The first coordination complexes of WO2Cl2 with an alkylurea are reported.
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Affiliation(s)
- Marco Bortoluzzi
- Università di Venezia Ca’ Foscari
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30170 Mestre
- Italy
| | | | - Fabio Marchetti
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Guido Pampaloni
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Fabio Piccinelli
- Università di Verona
- Dipartimento di Biotecnologie
- Laboratorio di Chimica dello Stato Solido
- I-37134 Verona
- Italy
| | - Stefano Zacchini
- Università di Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
- I-40136 Bologna
- Italy
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27
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Piccinelli F, Leonzio M, Bettinelli M, Monari M, Grazioli C, Melchior A, Tolazzi M. Tuning of the sensing properties of luminescent Eu3+ complexes towards the nitrate anion. Dalton Trans 2016; 45:3310-8. [DOI: 10.1039/c5dt04665c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The dependence of the luminescence sensing towards nitrate on the ligand donor ability, ligand stereochemistry, complex stoichiometry and concentration is shown.
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Affiliation(s)
- Fabio Piccinelli
- Luminescent Materials Laboratory
- DB
- Università di Verona
- and INSTM
- UdR Verona
| | - Marco Leonzio
- Luminescent Materials Laboratory
- DB
- Università di Verona
- and INSTM
- UdR Verona
| | - Marco Bettinelli
- Luminescent Materials Laboratory
- DB
- Università di Verona
- and INSTM
- UdR Verona
| | - Magda Monari
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- 40126 Bologna
- Italy
| | - Cristian Grazioli
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
| | - Andrea Melchior
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
| | - Marilena Tolazzi
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
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28
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Arpaia P, Girone M, Liccardo A, Pezzetti M, Piccinelli F. Metrological analysis of a virtual flowmeter-based transducer for cryogenic helium. Rev Sci Instrum 2015; 86:125001. [PMID: 26724060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The metrological performance of a virtual flowmeter-based transducer for monitoring helium under cryogenic conditions is assessed. At this aim, an uncertainty model of the transducer, mainly based on a valve model, exploiting finite-element approach, and a virtual flowmeter model, based on the Sereg-Schlumberger method, are presented. The models are validated experimentally on a case study for helium monitoring in cryogenic systems at the European Organization for Nuclear Research (CERN). The impact of uncertainty sources on the transducer metrological performance is assessed by a sensitivity analysis, based on statistical experiment design and analysis of variance. In this way, the uncertainty sources most influencing metrological performance of the transducer are singled out over the input range as a whole, at varying operating and setting conditions. This analysis turns out to be important for CERN cryogenics operation because the metrological design of the transducer is validated, and its components and working conditions with critical specifications for future improvements are identified.
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Affiliation(s)
- P Arpaia
- Department of Electrical Engineering and Information Technology, University of Napoli Federico II, Naples, Italy
| | - M Girone
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - A Liccardo
- Department of Electrical Engineering and Information Technology, University of Napoli Federico II, Naples, Italy
| | - M Pezzetti
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - F Piccinelli
- Department of Mechanical Engineering, University of Brescia, Brescia, Italy
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29
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Mihorianu M, Leonzio M, Bettinelli M, Piccinelli F. The paramagnetic metal effect on the luminescence of rare-earth-metal complexes with pyridine-based nitrogen ligands. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.08.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Arpaia P, Blanco E, Girone M, Inglese V, Pezzetti M, Piccinelli F, Serio L. Proof-of-principle demonstration of a virtual flow meter-based transducer for gaseous helium monitoring in particle accelerator cryogenics. Rev Sci Instrum 2015; 86:075004. [PMID: 26233405 DOI: 10.1063/1.4923466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A transducer based on a virtual flow meter is proposed for monitoring helium distribution and consumption in cryogenic systems for particle accelerators. The virtual flow meter allows technical and economical constraints, preventing installation of physical instruments in all the needed measurement points, to be overcome. Virtual flow meter performance for the alternative models of Samson [ http://www.samson.de (2015)] and Sereg-Schlumberger [ http://www.slb.com/ (2015)] is compared with the standard IEC 60534-2-1 [Industrial-process control valves-Part 2-1: Flow capacity-sizing equations for fluid flow under installed conditions (2011), https://webstore.iec.ch/publication/2461], for a large temperature range, for both gaseous and liquid helium phases, and for different pressure drops. Then, the calibration function of the transducer is derived. Finally, the experimental validation for the helium gaseous state on the test station for superconducting magnets in the laboratory SM18 [Pirotte et al., AIP Conf. Proc. 1573, 187 (2014)] at CERN is reported.
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Affiliation(s)
- P Arpaia
- Department of Electrical Engineering and Information Technologies, University of Napoli Federico II, Napoli, Italy
| | - E Blanco
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - M Girone
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - V Inglese
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - M Pezzetti
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - F Piccinelli
- Department of Industrial and Mechanical Engineering, University of Brescia, Brescia, Italy
| | - L Serio
- Technology Department, European Organization for Nuclear Research (CERN), Geneva, Switzerland
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31
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Piccinelli F, Bettinelli M, Melchior A, Grazioli C, Tolazzi M. Structural, optical and sensing properties of novel Eu(iii) complexes with furan- and pyridine-based ligands. Dalton Trans 2015; 44:182-92. [DOI: 10.1039/c4dt02326a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Effect of the ligand's donor ability on the luminescence sensing of nitrate anions.
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Affiliation(s)
- Fabio Piccinelli
- Laboratorio Materiali Luminescenti
- DB
- Università di Verona
- and INSTM
- UdR Verona
| | - Marco Bettinelli
- Laboratorio Materiali Luminescenti
- DB
- Università di Verona
- and INSTM
- UdR Verona
| | - Andrea Melchior
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
| | - Cristian Grazioli
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
| | - Marilena Tolazzi
- Dipartimento di Chimica
- Fisica e Ambiente
- Università di Udine
- 33100 Udine
- Italy
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32
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Astegno A, Maresi E, Marino V, Dominici P, Pedroni M, Piccinelli F, Dell'Orco D. Structural plasticity of calmodulin on the surface of CaF2 nanoparticles preserves its biological function. Nanoscale 2014; 6:15037-47. [PMID: 25367003 DOI: 10.1039/c4nr04368e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Nanoparticles are increasingly used in biomedical applications and are especially attractive as biocompatible and biodegradable protein delivery systems. Herein, the interaction between biocompatible 25 nm CaF2 nanoparticles and the ubiquitous calcium sensor calmodulin has been investigated in order to assess the potential of these particles to serve as suitable surface protein carriers. Calmodulin is a multifunctional messenger protein that activates a wide variety of signaling pathways in eukaryotic cells by changing its conformation in a calcium-dependent manner. Isothermal titration calorimetry and circular dichroism studies have shown that the interaction between calmodulin and CaF2 nanoparticles occurs with physiologically relevant affinity and that the binding process is fully reversible, occurring without significant alterations in protein secondary and tertiary structures. Experiments performed with a mutant form of calmodulin having an impaired Ca(2+)-binding ability in the C-terminal lobe suggest that the EF-hand Ca(2+)-binding motifs are directly involved in the binding of calmodulin to the CaF2 matrix. The residual capability of nanoparticle-bound calmodulin to function as a calcium sensor protein, binding to and altering the activity of a target protein, was successfully probed by biochemical assays. Even if efficiently carried by CaF2 nanoparticles, calmodulin may dissociate, thus retaining the ability to bind the peptide encompassing the putative C-terminal calmodulin-binding domain of glutamate decarboxylase and activate the enzyme. We conclude that the high flexibility and structural plasticity of calmodulin are responsible for the preservation of its function when bound in high amounts to a nanoparticle surface.
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33
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Marin-Dobrincic M, García-Sevillano J, Bettinelli M, Piccinelli F, Cantelar E, Cussó F. Quantification of energy transfer processes in LiLa₉(SiO₄)₆O₂:Er³⁺/Yb³⁺ under selective Er³⁺ excitation. Opt Express 2014; 22:14646-14656. [PMID: 24977560 DOI: 10.1364/oe.22.014646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The energy transfer mechanisms between Er3+ and Yb3+ ions have been investigated in LiLa9(SiO4)6O2 under selective Er3+ excitation. IR emission spectra, measured in the CW excitation regime, were used to establish a relationship between the macroscopic transfer and back transfer parameters. These measurements were combined with the results obtained under pulsed excitation to quantify the absolute values of transfer (Yb3+ → Er3+) and back transfer coefficients (Er3+ → Yb3+), C25 = 9.5 × 10−17 cm3s−1 and C52 = 1.4 × 10−17 cm3s−1, respectively. Additionally, it has been observed an energy transfer that reduces the quantum efficiency of the green emitting Er3+ levels. The corresponding macroscopic coefficient has been also determined (CGQ = 6.1 × 10−17 cm3s−1).
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34
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Trevisani M, Ivanovskikh K, Piccinelli F, Bettinelli M. Synchrotron Radiation Study of Interconfigurational 5d-4f Luminescence of Pr3+ in KLuP2O7. Zeitschrift für Naturforschung B 2014. [DOI: 10.5560/znb.2014-3260] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The double phosphate KLuP2O7 doped with Pr3+ ions was prepared by solid-state reaction. The material obtained was characterized by powder X-ray diffraction. The luminescence spectroscopy and the excited state dynamics of this material were studied upon excitation with VUV synchrotron radiation. The 5d-4 f emission of Pr3+ upon both direct and band gap excitation was detected and assigned. The decay kinetics of the Pr3+ 5d-4 f emission is characterized by a decay time of about 20 ns and is nearly temperature independent within the range 8 - 300 K. Both dynamics and energy transfer peculiarities revealed in the study suggested good potentials for application of KLuP2O7:Pr3+ as a fast scintillator material.
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Affiliation(s)
- Mattia Trevisani
- Laboratory of Luminescent Materials, Department of Biotechnology, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Konstantin Ivanovskikh
- Institute of Physics and Technology, Ural Federal University, Ekaterinburg 62002, Russia
| | - Fabio Piccinelli
- Laboratory of Luminescent Materials, Department of Biotechnology, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
| | - Marco Bettinelli
- Laboratory of Luminescent Materials, Department of Biotechnology, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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35
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Marino V, Astegno A, Pedroni M, Piccinelli F, Dell'Orco D. Nanodevice-induced conformational and functional changes in a prototypical calcium sensor protein. Nanoscale 2014; 6:412-423. [PMID: 24213152 DOI: 10.1039/c3nr04978g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Calcium (Ca(2+)) plays a major role in a variety of cellular processes. Fine changes in its concentration are detected by calcium sensor proteins, which adopt specific conformations to regulate their molecular targets. Here, two distinct nanodevices were probed as biocompatible carriers of Ca(2+)-sensors and the structural and functional effects of protein-nanodevice interactions were investigated. The prototypical Ca(2+)-sensor recoverin (Rec) was incubated with 20-25 nm CaF2 nanoparticles (NPs) and 70-80 nm liposomes with lipid composition similar to that found in photoreceptor cells. Circular dichroism and fluorescence spectroscopy were used to characterize changes in the protein secondary and tertiary structure and in thermal stability upon interaction with the nanodevice, both in the presence and in the absence of free Ca(2+). Variations in the hydrodynamic diameter of the complex were measured by dynamic light scattering and the residual capability of the protein to act as a Ca(2+)-sensor in the presence of NPs was estimated spectroscopically. The conformation, thermal stability and Ca(2+)-sensing capability of Rec were all significantly affected by the presence of NPs, while liposomes did not significantly perturb Rec conformation and function, allowing reversible binding. NP-bound Rec maintained an all-helical fold but showed lower thermal stability and high cooperativity of unfolding. Our analysis can be proficiently used to validate the biocompatibility of other nanodevices intended for biomedical applications involving Ca(2+)-sensors.
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Affiliation(s)
- Valerio Marino
- Department of Life Sciences and Reproduction, Section of Biological Chemistry, University of Verona, Verona, Italy.
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36
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Cantarelli IX, Pedroni M, Piccinelli F, Marzola P, Boschi F, Conti G, Sbarbati A, Bernardi P, Mosconi E, Perbellini L, Marongiu L, Donini M, Dusi S, Sorace L, Innocenti C, Fantechi E, Sangregorio C, Speghini A. Multifunctional nanoprobes based on upconverting lanthanide doped CaF2: towards biocompatible materials for biomedical imaging. Biomater Sci 2014; 2:1158-1171. [DOI: 10.1039/c4bm00119b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Lanthanide doped CaF2 nanoparticles are useful for in vivo optical and MR imaging and as nanothermometer probes, which do not induce pro-inflammatory cytokine secretion.
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Affiliation(s)
| | - Marco Pedroni
- Dipartimento di Biotecnologie
- Università di Verona and INSTM
- UdR Verona
- Verona, Italy
| | - Fabio Piccinelli
- Dipartimento di Biotecnologie
- Università di Verona and INSTM
- UdR Verona
- Verona, Italy
| | - Pasquina Marzola
- Dipartimento di Informatica
- Università di Verona and INSTM
- UdR Verona
- Verona, Italy
| | - Federico Boschi
- Dipartimento di Informatica
- Università di Verona and INSTM
- UdR Verona
- Verona, Italy
| | - Giamaica Conti
- Dipartimento di Scienze Neurologiche e del Movimento
- Università di Verona
- Verona, Italy
| | - Andrea Sbarbati
- Dipartimento di Scienze Neurologiche e del Movimento
- Università di Verona
- Verona, Italy
| | - Paolo Bernardi
- Dipartimento di Scienze Neurologiche e del Movimento
- Università di Verona
- Verona, Italy
| | - Elisa Mosconi
- Dipartimento di Scienze Neurologiche e del Movimento
- Università di Verona
- Verona, Italy
| | - Luigi Perbellini
- Dipartimento di Sanità Pubblica e Medicina di Comunità
- Università di Verona
- Verona, Italy
| | - Laura Marongiu
- Dipartimento di Patologia e Diagnostica
- Sezione di Patologia Generale
- Università di Verona
- Verona, Italy
| | - Marta Donini
- Dipartimento di Patologia e Diagnostica
- Sezione di Patologia Generale
- Università di Verona
- Verona, Italy
| | - Stefano Dusi
- Dipartimento di Patologia e Diagnostica
- Sezione di Patologia Generale
- Università di Verona
- Verona, Italy
| | - Lorenzo Sorace
- INSTM and Dipartimento di Chimica “U. Schiff”
- Università degli Studi di Firenze
- Firenze, Italy
| | - Claudia Innocenti
- INSTM and Dipartimento di Chimica “U. Schiff”
- Università degli Studi di Firenze
- Firenze, Italy
| | - Elvira Fantechi
- INSTM and Dipartimento di Chimica “U. Schiff”
- Università degli Studi di Firenze
- Firenze, Italy
| | | | - Adolfo Speghini
- Dipartimento di Biotecnologie
- Università di Verona and INSTM
- UdR Verona
- Verona, Italy
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37
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Piccinelli F, Lausi A, Bettinelli M. Structural investigation of the new Ca3Ln2Ge3O12 (Ln=Pr, Nd, Sm, Gd and Dy) compounds and luminescence spectroscopy of Ca3Gd2Ge3O12 doped with the Eu3+ ion. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.07.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Ma CG, Trevisani M, Piccinelli F, Ivanovskikh KV, Bettinelli M, Brik MG. Analysis of vacuum ultraviolet electronic spectra of Ce3+ and Pr3+ ions in Ca9Lu(PO4)7: crystal-field calculations and simulation of optical spectra. J Phys Condens Matter 2013; 25:165503. [PMID: 23553529 DOI: 10.1088/0953-8984/25/16/165503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The 4f-5d excitation and emission spectra of Ce(3+) and Pr(3+) ions in Ca9Lu(PO4)7 as recently reported (2012 J. Phys.: Condens. Matter 24 385502) were further analyzed and simulated by employing the effective Hamiltonian model for the 4f(N) and 4f(N-1)5d electronic configurations of impurity lanthanide ions and the exchange charge model of crystal-field theory. The multi-site effect on the 4f-5d transition spectra was explicitly discussed from the points of view of the local structure and site occupation ratios of lanthanide ions in Ca9Lu(PO4)7. An excellent agreement between the predicted and measured spectra confirms the validity of the performed calculations. Based on these energy level and intensity calculation results, the radiative lifetimes of the 5d-4f emissions of Ce(3+) and Pr(3+) ions have been modeled to show nearly independent temperature trends. Comparison with the measured lifetimes suggests the nonradiative relaxation process in this host is probably related to the intrinsic defect states. In addition to the studies of the 4f-5d transitions, a general theoretical scheme to calculate the lowest 4f-6s transition energy of the Ce(3+) ion was proposed for the first time on the basis of the ligand polarization model. The predicted 6s energy position of the Ce(3+) ion in Ca9Lu(PO4)7 is solid evidence corroborating our previous spectroscopic assignment.
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Affiliation(s)
- C-G Ma
- Institute of Physics, University of Tartu, Tartu 51014, Estonia.
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39
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Passuello T, Pedroni M, Piccinelli F, Polizzi S, Marzola P, Tambalo S, Conti G, Benati D, Vetrone F, Bettinelli M, Speghini A. PEG-capped, lanthanide doped GdF3 nanoparticles: luminescent and T2 contrast agents for optical and MRI multimodal imaging. Nanoscale 2012; 4:7682-7689. [PMID: 23117700 DOI: 10.1039/c2nr31796f] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A facile method for the synthesis of water dispersible Er(3+)/Yb(3+) and Tm(3+)/Yb(3+) doped upconverting GdF(3) nanoparticles is reported. Strong upconversion emissions are observed in the red (for Er/Yb doped) and near-infrared (for Tm/Yb doped) regions upon laser excitation at 980 nm. The PEG coating ensures a good dispersion of the system in water and reduces the radiationless de-excitation of the excited states of the Er(3+) and Tm(3+) ions by water molecules. The r(2) relaxivity values are quite high with respect to the common T(2)-relaxing agents (22.6 ± 3.4 mM(-1) s(-1) and 15.8 ± 3.4 mM(-1) s(-1) for the Tm/Yb and Er/Yb doped samples, respectively), suggesting that the present NPs can be interesting as T(2) weighted contrast agents for proton MRI purpose. Preliminary experiments conducted in vitro, in stem cell cultures, and in vivo, after subcutaneous injection of the lanthanide-doped GdF(3) NPs, indicate scarce toxic effects. After an intravenous injection in mice, the GdF(3) NPs localize mainly in the liver. The present results indicate that the present Er(3+)/Yb(3+) and Tm(3+)/Yb(3+) doped GdF(3) NPs are suitable candidates to be efficiently used as bimodal probes for both in vitro and in vivo optical and magnetic resonance imaging.
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Affiliation(s)
- Tiziana Passuello
- Dipartimento di Biotecnologie, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, I-37134 Verona, Italy
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40
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Pin S, Piccinelli F, Upendra Kumar K, Enzo S, Ghigna P, Cannas C, Musinu A, Mariotto G, Bettinelli M, Speghini A. Structural investigation and luminescence of nanocrystalline lanthanide doped NaNbO3 and Na0.5K0.5NbO3. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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41
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Piccinelli F, Lausi A, Speghini A, Bettinelli M. Crystal structure study of new lanthanide silicates with silico-carnotite structure. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.05.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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42
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Trevisani M, Ivanovskikh KV, Piccinelli F, Speghini A, Bettinelli M. Interconfigurational 5d → 4f luminescence of Ce3+ and Pr3+ in Ca9Lu(PO4)7. J Phys Condens Matter 2012; 24:385502. [PMID: 22944734 DOI: 10.1088/0953-8984/24/38/385502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ca(9)Lu(PO(4))(7):Ce (3+) and Ca (9)Lu (PO (4))(7):Pr (3+) polycrystalline materials were synthesized by solid state reaction at high temperature. The materials were characterized by powder x-ray diffraction (XRPD). The luminescence spectroscopy and the excited state dynamics of these compounds were investigated upon excitation with UV/VUV synchrotron radiation. Both materials showed efficient and fast 5d-4f emission upon direct VUV excitation into the 5d levels but only Ca(9)Lu(PO(4))(7):Ce (3+) revealed luminescence upon excitation across the bandgap. The decay kinetics of the 5d-4f emission upon VUV intra-center excitation is characterized by a decay time of 29 ns for Ce (3+) and 17 ns for Pr (3+) with no significant build-up after the excitation pulse. For the both compounds, no significant temperature dependence of the 5d-4f emission lifetime was observed within the range 8-300 K.
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Affiliation(s)
- M Trevisani
- Laboratory of Solid State Chemistry, Department of Biotechnology, University of Verona, and INSTM, UdR Verona, Verona, Italy
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43
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Passuello T, Piccinelli F, Trevisani M, Giarola M, Mariotto G, Marciniak L, Hreniak D, Guzik M, Fasoli M, Vedda A, Jary V, Nikl M, Causin V, Bettinelli M, Speghini A. Structural and optical properties of Vernier phase lutetium oxyfluorides doped with lanthanide ions: interesting candidates as scintillators and X-ray phosphors. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31317k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Bos AJ, Dorenbos P, Bessière A, Lecointre A, Bedu M, Bettinelli M, Piccinelli F. Study of TL glow curves of YPO4 double doped with lanthanide ions. RADIAT MEAS 2011. [DOI: 10.1016/j.radmeas.2011.04.021] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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Dong NN, Pedroni M, Piccinelli F, Conti G, Sbarbati A, Ramírez-Hernández JE, Maestro LM, Iglesias-de la Cruz MC, Sanz-Rodriguez F, Juarranz A, Chen F, Vetrone F, Capobianco JA, Solé JG, Bettinelli M, Jaque D, Speghini A. NIR-to-NIR two-photon excited CaF2:Tm3+,Yb3+ nanoparticles: multifunctional nanoprobes for highly penetrating fluorescence bio-imaging. ACS Nano 2011; 5:8665-71. [PMID: 21957870 DOI: 10.1021/nn202490m] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In this study, we report on the remarkable two-photon excited fluorescence efficiency in the "biological window" of CaF(2):Tm(3+),Yb(3+) nanoparticles. On the basis of the strong Tm(3+) ion emission (at around 800 nm), tissue penetration depths as large as 2 mm have been demonstrated, which are more than 4 times those achievable based on the visible emissions in comparable CaF(2):Er(3+),Yb(3+) nanoparticles. The outstanding penetration depth, together with the fluorescence thermal sensitivity demonstrated here, makes CaF(2):Tm(3+),Yb(3+) nanoparticles ideal candidates as multifunctional nanoprobes for high contrast and highly penetrating in vivo fluorescence imaging applications.
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Affiliation(s)
- Ning-Ning Dong
- Fluorescence Imaging Group, Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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46
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Pedroni M, Piccinelli F, Passuello T, Giarola M, Mariotto G, Polizzi S, Bettinelli M, Speghini A. Lanthanide doped upconverting colloidal CaF2 nanoparticles prepared by a single-step hydrothermal method: toward efficient materials with near infrared-to-near infrared upconversion emission. Nanoscale 2011; 3:1456-60. [PMID: 21336370 DOI: 10.1039/c0nr00860e] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Colloidal Er(3+)/Yb(3+), Tm(3+)/Yb(3+) and Ho(3+)/Yb(3+) doped CaF(2) nanoparticles have been prepared by a one-pot hydrothermal procedure and their upconversion properties have been investigated.
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Affiliation(s)
- Marco Pedroni
- Laboratorio di Chimica dello Stato Solido, Dipartimento di Biotecnologie, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, I-37134, Verona, Italy
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Bianco A, Cacciotti I, Fragalá ME, Lamastra FR, Speghini A, Piccinelli F, Malandrino G, Gusmano G. Eu-doped titania nanofibers: processing, thermal behaviour and luminescent properties. J Nanosci Nanotechnol 2010; 10:5183-5190. [PMID: 21125868 DOI: 10.1166/jnn.2010.2215] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Undoped and Europium-doped titania nanofibers have been fabricated by electrospinning technique, using a single multielement Titanium/Europium source. In this communication we present the synthesis, structural and spectroscopic characterisation of Eu-doped TiO2 nanofibers starting from polyvinylpyrrolidone, titanium tetraisopropoxide (Ti(OiPr)4) and Eu(hfa)3 x diglyme (Hhfa = 1,1,1,5,5,5-hexafluoroacetyacetone, diglyme = CH3O(CH2CH2O)2CH3). The chosen system allowed to investigate a wide compositional range, i.e., from 3 to 10% mol of Eu3+. Microstructure was studied by means of scanning electron microscopy (SEM), thermal behaviour followed by thermogravimetric and differential thermal analysis (TG-DTA). Phase analysis was performed by means of X-ray diffraction (XRD) and high temperature X-ray diffraction analysis (HT-XRD) up to 1100 degrees C. Luminescence properties were investigated by means of luminescence spectroscopy, using a laser excitation source at 395 nm. All electrospun materials consisted of randomly oriented nanofibers of fairly uniform diameter. The average fiber size was 80-100 nm and 40 nm for, respectively, Eu-doped and undoped TiO2 calcinated at 500 degrees C. The presence of Europium shifted toward higher values either the crystallization temperature of anatase and the anatase to rutile phase transition, the latter being accompanied by the formation of the Eu2Ti2O7 phase. The doped samples showed a strong luminescence of Eu3+ ions. The emission spectra were dominated by the 5D0 --> 7F2 emission, suggesting a notable distortion around the Eu3+ ions. The broadening of the bands pointed to the presence of a relevant inhomogeneous disorder around the Eu3+ sites. The Eu3+ doped TiO2 nanofibers showed a higher emission intensity with respect to the PVP/TiO2 ones.
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Affiliation(s)
- Alessandra Bianco
- University of Rome "Tor Vergata", Dipartimento di Scienze e Tecnologie Chimiche, INSTM UdR, Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
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48
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Venkatramu V, Giarola M, Mariotto G, Enzo S, Polizzi S, Jayasankar CK, Piccinelli F, Bettinelli M, Speghini A. Nanocrystalline lanthanide-doped Lu3Ga5O12 garnets: interesting materials for light-emitting devices. Nanotechnology 2010; 21:175703. [PMID: 20368677 DOI: 10.1088/0957-4484/21/17/175703] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Nanocrystalline Lu(3)Ga(5)O(12), with average particle sizes of 40 nm, doped with a wide variety of luminescent trivalent lanthanide ions have been prepared using a sol-gel technique. The structural and morphological properties of the powders have been investigated by x-ray powder diffraction, high resolution transmission electron microscopy and Raman spectroscopy. Structural data have been refined and are presented for Pr(3+), Eu(3+), Gd(3+), Ho(3+), Er(3+) and Tm(3+) dopants, while room temperature excited luminescence spectra and emission decay curves of Eu(3+)-, Tm(3+)- and Ho(3+)-doped Lu(3)Ga(5)O(12) nanocrystals have been measured and are discussed. The Eu(3+) emission spectrum shows typical bands due to 5D(0)-->7F(J) (J = 0, 1, 2, 3, 4) transitions and the broadening of these emission bands with the non-exponential behaviour of the decay curves indicates the presence of structural disorder around the lanthanide ions. Lanthanide-doped nanocrystalline Lu(3)Ga(5)O(12) materials show better luminescence intensities compared to Y(2)O(3), Gd(3)Ga(5)O(12) and Y(3)Al(5)O(12) nanocrystalline hosts. Moreover, the upconversion emission intensity in the blue-green region for the Tm(3+)- and Ho(3+)-doped samples shows a significant increase upon 647.5 nm excitation with respect to other common oxide hosts doped with the same lanthanide ions.
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Affiliation(s)
- V Venkatramu
- Department of Physics, Yogi Vemana University, Kadapa, India
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Bandini M, Bianchi M, Valenti G, Piccinelli F, Paolucci F, Monari M, Umani-Ronchi A, Marcaccio M. Electrochemiluminescent Functionalizable Cyclometalated Thiophene-Based Iridium(III) Complexes. Inorg Chem 2010; 49:1439-48. [DOI: 10.1021/ic901660m] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Marco Bandini
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Michele Bianchi
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Giovanni Valenti
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Fabio Piccinelli
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Francesco Paolucci
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Magda Monari
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Achille Umani-Ronchi
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Massimo Marcaccio
- Dipartimento di Chimica “G. Ciamician”, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy
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50
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Balducci D, Lazzari I, Monari M, Piccinelli F, Porzi G. (S)-α-methyl,α-amino acids: a new stereocontrolled synthesis. Amino Acids 2009; 38:829-37. [DOI: 10.1007/s00726-009-0289-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Accepted: 03/31/2009] [Indexed: 11/29/2022]
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