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Bardají M, Font-Bardia M, Gallen A, Garcia-Cirera B, Ferrer M, Martínez M. Iron complexes of bridging azo ligands in aqueous solution: changes in the thermal switching mechanism on coordination and oxidation state of metal centres. Dalton Trans 2023; 52:1720-1730. [PMID: 36655477 DOI: 10.1039/d2dt03790d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Three azobenzenes CN(C6H4)-NN-(C5H4N) (py-iso), CN(C6H4)-NN-(C6H4)CN (cyano-iso) and CN(C6H4)-NN-(C6H4)NC (iso-iso) with good coordinating groups (pyridine, phenylcyano or phenylisocyano) at the ends of the diazenyl unit have been synthesized and fully characterised. These compounds have been used as ligands in the synthesis of water-soluble metallic species by coordination to {FeII(CN)53-} units, either in one or two of the anchoring groups of the derivatives. Both the azo derivatives and their complexes are photochemically active with respect to their trans-to-cis isomerisation process. Their cis-to-trans reverse thermal reaction has been thoroughly studied as a function of the donor groups, solvent, temperature and pressure, in order to gain insight into the rotation or inversion mechanisms involved in the process. A comparison of the isomerisation mechanism between the iron complexes and the corresponding free ligands revealed an interesting fine tuning of the process on coordination of the {FeII(CN)53-} moieties, which may even produce, in some cases, non-photoswitchable species containing typically photoactive units.
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Affiliation(s)
- Manuel Bardají
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
| | - Mercè Font-Bardia
- Unitat de Difracció de RX, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB). Universitat de Barcelona, Solé i Sabarís 1-3, 08028 Barcelona, Spain
| | - Albert Gallen
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
| | - Beltzane Garcia-Cirera
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
| | - Montserrat Ferrer
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain. .,Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Manuel Martínez
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain. .,Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
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Gallen A, Jover J, Ferrer M, Martínez M. Building a molecular PrussianBlueAnalogue FeII/CoIII cube around a Cs+ ion; a preferred, tight, robust, water soluble, and kinetically inert encapsulator. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ros E, Bellido M, Matarin JA, Gallen A, Martínez M, Rodríguez L, Verdaguer X, Ribas de Pouplana L, Riera A. Amino acids with fluorescent tetrazine ethers as bioorthogonal handles for peptide modification. RSC Adv 2022; 12:14321-14327. [PMID: 35702248 PMCID: PMC9096626 DOI: 10.1039/d2ra02531k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/05/2022] [Indexed: 11/21/2022] Open
Abstract
A set of 3-bromo-1,2,4,5-tetrazines with three distinct substitutions have been used as reagents for late-stage functionalization of small molecules through nucleophilic aromatic substitution. Spectroscopic studies of the products obtained proved that tetrazine ethers are intrinsically fluorescent. This fluorescence is lost upon inverse Electron-Demand Diels–Alder (iEDDA) cycloaddition with strained alkenes. Tetrazine-phenol ethers are rather interesting because they can undergo rapid iEDDA reactions with a second order rate constant (k2) compatible with bioorthogonal ligations. As a showcase, l-tyrosine was derivatized with 3-bromo-6-methyl-1,2,4,5-tetrazine and coupled to the peptide drug octreotide. This peptide was detected in cellular flow cytometry, and its fluorescence turned off through a bioorthogonal iEDDA cycloaddition with a strained alkene, showing for the first time the detection and reactivity of intrinsically fluorescent tetrazines in a biologically relevant context. The synthesis and characterization of fluorescent tetrazine ethers with bioorthogonal applicability pave the way for the generation of useful compounds for both detection and bioconjugation in vivo. Octreotide derivatized with the fluorogenic amino acid 6-methyltetratrazinyl tryosine. Emission spectra before and after the iEDDA cycloaddition.![]()
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Affiliation(s)
- Enric Ros
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain
| | - Marina Bellido
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain
| | - Joan A Matarin
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain .,BCN Peptides S.A., Pol. Ind. Els Vinyets-Els Fogars Sector II, Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona Barcelona Spain
| | - Albert Gallen
- Departament de Química Inorgànica i Orgànica, Secció Química Inorgànica. Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain
| | - Manuel Martínez
- Departament de Química Inorgànica i Orgànica, Secció Química Inorgànica. Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain.,Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona 08028. Barcelona Spain
| | - Laura Rodríguez
- Departament de Química Inorgànica i Orgànica, Secció Química Inorgànica. Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain.,Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona 08028. Barcelona Spain
| | - Xavier Verdaguer
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain .,Departament de Química Inorgànica i Orgànica, Secció Química Orgànica. Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain
| | - Lluís Ribas de Pouplana
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain .,Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23 08010 Barcelona Spain
| | - Antoni Riera
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology Baldiri Reixac 10 08028 Barcelona Spain .,Departament de Química Inorgànica i Orgànica, Secció Química Orgànica. Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain
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Gonzálvez MA, Bernhardt PV, Font-Bardia M, Gallen A, Jover J, Ferrer M, Martínez M. Molecular Approach to Alkali-Metal Encapsulation by a Prussian Blue Analogue Fe II/Co III Cube in Aqueous Solution: A Kineticomechanistic Exchange Study. Inorg Chem 2021; 60:18407-18422. [PMID: 34766767 PMCID: PMC8715505 DOI: 10.1021/acs.inorgchem.1c03001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The preparation of a series of alkali-metal inclusion complexes of the molecular cube [{CoIII(Me3-tacn)}4{FeII(CN)6}4]4- (Me3-tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane), a mixed-valent Prussian Blue analogue bearing bridging cyanido ligands, has been achieved by following a redox-triggered self-assembly process. The molecular cubes are extremely robust and soluble in aqueous media ranging from 5 M [H+] to 2 M [OH-]. All the complexes have been characterized by the standard mass spectometry, UV-vis, inductively coupled plasma, multinuclear NMR spectroscopy, and electrochemistry. Furthermore, X-ray diffraction analysis of the sodium and lithium salts has also been achieved, and the inclusion of moieties of the form {M-OH2}+ (M = Li, Na) is confirmed. These inclusion complexes in aqueous solution are rather inert to cation exchange and are characterized by a significant decrease in acidity of the confined water molecule due to hydrogen bonding inside the cubic cage. Exchange of the encapsulated cationic {M-OH2}+ or M+ units by other alkali metals has also been studied from a kineticomechanistic perspective at different concentrations, temperatures, ionic strengths, and pressures. In all cases, the thermal and pressure activation parameters obtained agree with a process that is dominated by differences in hydration of the cations entering and exiting the cage, although the size of the portal enabling the exchange also plays a determinant role, thus not allowing the large Cs+ cation to enter. All the exchange substitutions studied follow a thermodynamic sequence that relates with the size and polarizing capability of the different alkali cations; even so, the process can be reversed, allowing the entry of {Li-OH2}+ units upon adsorption of the cube on an anion exchange resin and subsequent washing with a Li+ solution.
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Affiliation(s)
- Miguel A Gonzálvez
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia.,Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Mercè Font-Bardia
- Unitat de Difracció de Raigs, X. Centre Científic i Tecnològic,Departament de Cristal·lografia, and Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
| | - Albert Gallen
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Jesús Jover
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institut de Química Teòrica i Computacional, Universitat de Barcelona, 08028 Barcelona, Spain
| | - Montserrat Ferrer
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institute of Nanoscience and Nanotechnology, Universitat de Barcelona, 08028 Barcelona, Spain
| | - Manuel Martínez
- Secció de Química Inorgànica, Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.,Institute of Nanoscience and Nanotechnology, Universitat de Barcelona, 08028 Barcelona, Spain
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Zimara J, Stevens H, Oswald R, Demeshko S, Dechert S, Mata RA, Meyer F, Schwarzer D. Time-Resolved Spectroscopy of Photoinduced Electron Transfer in Dinuclear and Tetranuclear Fe/Co Prussian Blue Analogues. Inorg Chem 2020; 60:449-459. [PMID: 33332100 DOI: 10.1021/acs.inorgchem.0c03249] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamics of the photodriven charge transfer-induced spin transition (CTIST) in two Fe/Co Prussian Blue Analogues (PBAs) are revealed by femtosecond IR and UV/vis pump-probe spectroscopy. Depending on temperature, the known tetranuclear square-type complex [Co2Fe2(CN)6(tp*)2(4,4'-dtbbpy)4](PF6)2 (1) exists in two electronic states. In acetonitrile solution, at <240 K, the low temperature (LT) phase is prevalent consisting of low-spin Fe(II) and low-spin Co(III), [FeIILSCoIIILS]2. Temperature rise is the reason behind thermally-induced CTIST toward the high temperature (HT) phase consisting of low-spin Fe(III) and high-spin Co(II), [FeIIILSCoIIHS]2, being prevalent at >300 K. Photoexcitation into the intervalence charge transfer (IVCT) band of the LT phase at 800 nm induces electron transfer in one Fe-Co edge of PBA 1 and produces a [FeIIILSCoIILS] intermediate which by spin-crossover (SCO) is stabilized within 400 fs to a long-lived (>1 ns) [FeIIILSCoIIHS] species. In contrast, IVCT excitation of the HT phase at 400 nm generates a [FeIILSCoIIIHS] species with a lifetime of 3.6 ps. Subsequent back-electron transfer populates the vibrationally hot ground state, which thermalizes within 8 ps. The newly synthesized dinuclear PBA, [CoFe(CN)3(tp*)(pz*4Lut)]ClO4 (2), provides a benchmark of the HT phase of 1, i.e., [FeIIILSCoIIHS], as verified by variable temperature magnetic susceptibility measurements and 57Fe Mössbauer spectroscopy. The photoinduced charge transfer dynamics of PBA 2 indeed are almost identical to that of the HT phase of PBA 1 with a lifetime of the excited [FeIILSCoIIIHS] species of 3.8 ps.
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Affiliation(s)
- Jennifer Zimara
- Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Hendrik Stevens
- University of Göttingen, Institute for Inorganic Chemistry, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Rainer Oswald
- University of Göttingen, Institute for Physical Chemistry, Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Serhiy Demeshko
- University of Göttingen, Institute for Inorganic Chemistry, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- University of Göttingen, Institute for Inorganic Chemistry, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Ricardo A Mata
- University of Göttingen, Institute for Physical Chemistry, Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Franc Meyer
- University of Göttingen, Institute for Inorganic Chemistry, Tammannstrasse 4, D-37077 Göttingen, Germany.,International Center for Advanced Studies of Energy Conversion (ICASEC), Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Dirk Schwarzer
- Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
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