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Nodaraki LE, Liu J, Ariciu AM, Ortu F, Oakley MS, Birnoschi L, Gransbury GK, Cobb PJ, Emerson-King J, Chilton NF, Mills DP, McInnes EJL, Tuna F. Metal-carbon bonding in early lanthanide substituted cyclopentadienyl complexes probed by pulsed EPR spectroscopy. Chem Sci 2024; 15:3003-3010. [PMID: 38404384 PMCID: PMC10882510 DOI: 10.1039/d3sc06175b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 01/12/2024] [Indexed: 02/27/2024] Open
Abstract
We examine lanthanide (Ln)-ligand bonding in a family of early Ln3+ complexes [Ln(Cptt)3] (1-Ln, Ln = La, Ce, Nd, Sm; Cptt = C5H3tBu2-1,3) by pulsed electron paramagnetic resonance (EPR) methods, and provide the first characterization of 1-La and 1-Nd by single crystal XRD, multinuclear NMR, IR and UV/Vis/NIR spectroscopy. We measure electron spin T1 and Tm relaxation times of 12 and 0.2 μs (1-Nd), 89 and 1 μs (1-Ce) and 150 and 1.7 μs (1-Sm), respectively, at 5 K: the T1 relaxation of 1-Nd is more than 102 times faster than its valence isoelectronic uranium analogue. 13C and 1H hyperfine sublevel correlation (HYSCORE) spectroscopy reveals that the extent of covalency is negligible in these Ln compounds, with much smaller hyperfine interactions than observed for equivalent actinide (Th and U) complexes. This is corroborated by ab initio calculations, confirming the predominant electrostatic nature of the metal-ligand bonding in these complexes.
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Affiliation(s)
- Lydia E Nodaraki
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
- Photon Science Institute, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Jingjing Liu
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Ana-Maria Ariciu
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
- Photon Science Institute, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Fabrizio Ortu
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Meagan S Oakley
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Letitia Birnoschi
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Gemma K Gransbury
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Philip J Cobb
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Jack Emerson-King
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Nicholas F Chilton
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - David P Mills
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Eric J L McInnes
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
- Photon Science Institute, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Floriana Tuna
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
- Photon Science Institute, The University of Manchester Oxford Road Manchester M13 9PL UK
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2
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Gil Y, de Santana RC, Vega A, Aravena D, Spodine E. Influence of symmetry on the magneto-optical properties of a bifunctional macrocyclic Dy III complex. Dalton Trans 2023. [PMID: 38014706 DOI: 10.1039/d3dt03042c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
In this work, a novel complex, [Dy(LPr)(NO3)2]·(H2O)·(NO3) (1), containing a highly distorted macrocyclic ligand (LPr) and weak axial anions (NO3-), was synthesized and characterized. Even though this coordination environment is not ideal for maximizing the magnetic anisotropy of a DyIII ion, a magneto-structural analysis reveals that the high distortion of the macrocycle promotes a disposition of the hard plane and easy axis opposite to the expected one. This results in a quite symmetrical environment which allows obtaining a field induced SMM behaviour. The magnetic relaxation properties of this complex were rationalized with the aid of ab initio multireference calculations. Moreover, 1 showed the characteristic emission bands of DyIII ion, indicating that the macrocyclic ligand acts as an efficient sensitizer in the energy transfer process to the emissive state of the DyIII ion. Due to the symmetric environment of 1, the Y/B intensity ratio (0.61) results in CIE coordinates (0.278; 0.314), close to those of the white light region. To gain further insight into the mechanism leading to the luminescence properties, ab initio calculations were performed to elucidate the key factors controlling the Y/B intensity ratio in this bifunctional complex.
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Affiliation(s)
- Yolimar Gil
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
| | - Ricardo Costa de Santana
- Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, 74690-900, Goiânia (GO), Brazil
| | - Andrés Vega
- Departamento de Ciencias Químicas, Universidad Andrés Bello, Santiago, Chile
| | - Daniel Aravena
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile.
| | - Evgenia Spodine
- Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
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Adimule V, Dv S, Sharma K, Manhas N, Bathula C. Development of Highest Value of the Measured Efficiency of Mesoporous Petal Shaped Europium (III) Doped Cobalt Tetroxide@Cupric Oxide Hybrid Nanomaterials for Enhanced Room Temperature Photoluminescence and Fluorescence Decay Properties. J Fluoresc 2023:10.1007/s10895-023-03471-1. [PMID: 37897516 DOI: 10.1007/s10895-023-03471-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 10/12/2023] [Indexed: 10/30/2023]
Abstract
In our work, a novel series of europium (III) (Eu3+) (5, 10 and 15 wt %) doped cobalt tetroxide@cupric oxide (Co3O4@CuO) nanomaterials (NMs) were synthesized by facile coprecipitation method. The synthesized NMs were characterized by XRD (X-ray diffraction), FT-IR (Fourier transform infrared), UV (ultraviolet)-visible absorption spectra, XPS (X-ray photoelectron), BET (Brunauer-Emmett-Teller) analytical methods. Crystal structure studies revealed the formation of polycrystalline nature with monoclinic and cubic phase. The morphology studies of Eu3+x:Co3O4@CuO (x = 5, 10 and 15 wt %) showed petal shape nanoparticles (NPs) with agglomeration. Redshift in optical absorption spectra appeared with a significant impact on the optical band gap as Eu3+ concentration increases on Co3O4@CuO bimetallic oxide NMs. The chemical composition and valence state of the elements confirmed from XPS studies detected the presence of Eu, Cu, Co, O and C elements. An increase in the pore size and surface area resulted as the Eu3+ concentration increased on Co3O4@CuO NMs. However, room temperature photoluminescence (RTPL) spectra of Co3O4@CuO bimetallic oxide NMs at two different excitations (λ excitation = 280 nm, 320 nm) showed sharp, strong emission intensities located at near ultraviolet (NUV) region and weak emissions detected at far ultraviolet (FUV) regions of the RTPL spectrum. Further, visible range emission intensities were displayed by Eu3+:Co3O4@CuO (5, 10 and 15 wt %) NMs when exited at 280 nm. The characteristic white light emission peaks in the visible range of the RTPL spectra showed intense blue, green and orange colours. Emission intensity increases with an increase in Eu3+ concentration on Co3O4@CuO bimetallic oxide NMs. The fluorescence (FL) decay spectra of Eu3+ 10wt% and 15 wt%: Co3O4@CuO NMs showed a decay lifetime of 2.54 and 2.31 ns (ns) attributed to the dynamic, ultrafast excitation energy transfer between Eu3+ (dopant) and Co3O4@CuO (host) NMs. It is proposed that enhanced RTPL emission intensity and FL decay behavior of Eu3+x:Co3O4@CuO NMs closely related to the change in the optical band gap, variation in the crystallite size, formation of more number of oxygen vacancies in the crystal structure of hybrid nanomaterials.
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Affiliation(s)
- Vinayak Adimule
- Department of Chemistry, Angadi Institute of Technology and Management (AITM), Savagaon Road, Belagavi, 590009, Karnataka, India.
| | - Sunitha Dv
- Department of Physics, School of Applied Sciences, REVA University, Bangalore, 560064, Karnataka, India
| | - Kalpana Sharma
- Department of Physics, M S Ramaiah Institute of Technology, MSR Nagar, Bangalore, 560054, Karnataka, India
| | - Nidhi Manhas
- Chemistry Discipline, School of Sciences, Indira Gandhi National Open University (IGNOU), Maidan Garhi, 110068, New Delhi, India
| | - Chinna Bathula
- Division of Electronics and Electrical Engineering, Dongguk University, Seoul, 04620, Republic of Korea
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Filer CN. Luminescence enhancement by deuterium. J Labelled Comp Radiopharm 2023; 66:372-383. [PMID: 37587721 DOI: 10.1002/jlcr.4056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 07/13/2023] [Indexed: 08/18/2023]
Abstract
Created literally at the dawn of time, deuterium has been extremely valuable in so many chemistry roles. The subject of this review focuses on one deuterium application in particular: its enhancement of luminescence in many substances. After providing general overviews of both deuterium and luminescence, the early exploration of deuterium's effect on luminescence is described, followed by a number of specific topics. These sections include a discussion of deuterium-influenced luminescence for dyes, proteins, singlet oxygen, and the lanthanide elements, as well as anomalous inverse deuterium luminescence effects. Future directions for this important research topic are also proposed, as well as a summary conclusion.
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Culeac IP, Verlan VI, Bordian OT, Zubareva VE, Iovu MS, Bulhac II, Siminel NA, Siminel AV, Mihai G, Enachescu M. Synthesis and Characterization of Coordination Compound [Eu(µ 2-OC 2H 5)(btfa)(NO 3)(phen)] 2phen with High Luminescence Efficiency. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2788. [PMID: 36014653 PMCID: PMC9415948 DOI: 10.3390/nano12162788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 08/10/2022] [Accepted: 08/10/2022] [Indexed: 06/15/2023]
Abstract
A high-luminescent, blue-light excitable europium(III) coordination complex, [Eu(µ2-OC2H5)(btfa)(NO3)(phen)]2phen (1) {btfa = benzoyl trifluoroacetone, phen = 1,10-phenantroline}, has been synthesized and investigated. The complex was characterized by infrared (IR) and photoluminescence (PL) spectroscopy. The PL emission spectra of powder samples registered in a range of 10.7-300 K exhibit characteristic metal-centered luminescence bands, assigned to internal radiative transitions of the Eu3+ ion, 5D1→7Fj and 5D0→7Fj (j = 0-4). The high-resolution spectrum of the transition 5D0→7F0 shows that it consists of two narrow components, separated by 0.96 meV, which indicates the presence in the matrix of two different sites of the Eu3+ ion. The splitting pattern of 5D0→7Fj (j = 0-4) transitions indicates that europium ions are located in a low-symmetry environment. The absolute quantum yield and the sensitization efficiency were determined to be 49.2% and 89.3%, respectively. The complex can be excited with low-cost lasers at around 405 nm and is attractive for potential applications in optoelectronics and biochemistry.
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Affiliation(s)
- Ion P. Culeac
- Institute of Applied Physics, MD-2028 Chisinau, Moldova
| | | | | | | | | | | | | | | | - Geanina Mihai
- Center for Surface Science and Nanotechnology, University Politehnica of Bucharest, 060042 Bucharest, Romania
- S.C. NanoPRO START MC S.R.L., 110310 Pitesti, Romania
| | - Marius Enachescu
- Center for Surface Science and Nanotechnology, University Politehnica of Bucharest, 060042 Bucharest, Romania
- Academy of Romanian Scientists, 550044 Bucharest, Romania
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