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El-Khatib F, Cahier B, López-Jordà M, Guillot R, Rivière E, Hafez H, Saad Z, Girerd JJ, Guihéry N, Mallah T. Design of a Binuclear Ni(II) Complex with Large Ising-type Anisotropy and Weak Anti-Ferromagnetic Coupling. Inorg Chem 2017; 56:10655-10663. [PMID: 28832136 DOI: 10.1021/acs.inorgchem.7b01609] [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: 11/29/2022]
Abstract
The preparation of a binuclear Ni(II) complex with a pentacoordinate environment using a cryptand organic ligand and the imidazolate bridge is reported. The coordination sphere is close to trigonal bipyramidal (tbp) for one Ni(II) and to square pyramidal (spy) for the other. The use of the imidazolate bridge that undergoes π-π stacking with two benzene rings of the chelating ligand induces steric hindrance that stabilizes the pentacoordinate environment. Magnetic measurements together with theoretical studies of the spin states energy levels allow fitting the data and reveal a large Ising-type anisotropy and a weak anti-ferromagnetic exchange coupling between the metal ions. The magnitude and the nature of the magnetic anisotropy and the difference in anisotropy between the two metal ions are rationalized using wave-function-based calculations. We show that a slight distortion of the coordination sphere of Ni(II) from spy to tbp leads to an Ising-type anisotropy. Broken-symmetry density functional calculations rationalize the weak anti-ferromagnetic exchange coupling through the imidazolate bridge.
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Affiliation(s)
- Fatima El-Khatib
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France.,Lebanese University, Inorganic & Environmental Chemistry Laboratory, Faculty of Sciences I, Hadath, Lebanese University , Beirut, Lebanon
| | - Benjamin Cahier
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
| | - Maurici López-Jordà
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
| | - Hala Hafez
- Lebanese University, Inorganic & Environmental Chemistry Laboratory, Faculty of Sciences I, Hadath, Lebanese University , Beirut, Lebanon
| | - Zeinab Saad
- Lebanese University, Inorganic & Environmental Chemistry Laboratory, Faculty of Sciences I, Hadath, Lebanese University , Beirut, Lebanon
| | - Jean-Jacques Girerd
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique Quantiques, Université Toulouse III , 118 route de Narbonne, 31062 Toulouse, France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, CNRS , Université Paris Saclay, 91405 Orsay Cedex, France
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El-Khatib F, Cahier B, Shao F, López-Jordà M, Guillot R, Rivière E, Hafez H, Saad Z, Girerd JJ, Guihéry N, Mallah T. Design and Magnetic Properties of a Mononuclear Co(II) Single Molecule Magnet and Its Antiferromagnetically Coupled Binuclear Derivative. Inorg Chem 2017; 56:4602-4609. [DOI: 10.1021/acs.inorgchem.7b00205] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [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)
- Fatima El-Khatib
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
- Lebanese University, Inorganic & Environmental Chemistry Laboratory (IECL), Faculty of Sciences I, Hadath, Lebanese University, Beirut, Lebanon
| | - Benjamin Cahier
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Feng Shao
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Maurici López-Jordà
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Régis Guillot
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Eric Rivière
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Hala Hafez
- Lebanese University, Inorganic & Environmental Chemistry Laboratory (IECL), Faculty of Sciences I, Hadath, Lebanese University, Beirut, Lebanon
| | - Zeinab Saad
- Lebanese University, Inorganic & Environmental Chemistry Laboratory (IECL), Faculty of Sciences I, Hadath, Lebanese University, Beirut, Lebanon
| | - Jean-Jacques Girerd
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique Quantiques, Université Toulouse III, 118 route de Narbonne, 31062 Toulouse, France
| | - Talal Mallah
- Institut de Chimie
Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
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Bonvoisin J, Blondin G, Girerd JJ, Zimmermann JL. Theoretical study of the multiline EPR signal from the S(2) state of the oxygen evolving complex of photosystem II: Evidence for a magnetic tetramer. Biophys J 2010; 61:1076-86. [PMID: 19431827 DOI: 10.1016/s0006-3495(92)81917-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The Oxygen evolving complex of plant photosystem II is made of a manganese cluster that gives rise to a low temperature EPR multiline signal in the S(2) oxidation state. The origin of this EPR signal has been addressed with respect to the question of the magnetic couplings between the electron and nuclear spins of the four possible Mn ions that make up this complex. Considering Mn(III) and Mn(IV) as the only possible oxidation states present in the S(2) state, and no large anisotropy of the magnetic tensors, the breadths of the EPR spectra calculated for dimers and trimers with S = (1/2) have been compared with that of the biological site. It is concluded that neither a dinuclear nor a trinuclear complex made of Mn(III) and Mn(IV) can be responsible for the multiline signal; but that, by contrast, a tetranuclear Mn complex can be the origin of this signal. The general shape of the experimental spectrum, its particular hyperfine pattern, the positions of most of the hyperfine lines and their relative intensities can be fit by a tetramer model described by the following six fitting parameters: g approximately 1.987, A(1) approximately 122.4 10(-4) cm(-1), A(2) approximately 87.2 10(-4) cm(-1), A(3) approximately 81.6 10(-4) cm(-1), A(4) approximately 19.1 10(-4) cm(-1) and deltaH = 24.5 G. A second model described by parameters very close to those given above except for A(4) approximately 77.5 10(-4) cm(-1) gives an equally good fit. However, no other set of parameters gives an EPR spectrum that reproduces the hyperfine pattern of the S(2) multiline signal. This demonstrates that in the S(2) state of the oxygen evolving complex, the four manganese ions are organized in a magnetic tetramer.
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Affiliation(s)
- J Bonvoisin
- Centre d'Elaboration de Matériaux et d'Etudes Structurales, Laboratoire d'Optique Electronique, CNRS UPR A 8011, B.P. 4347, 29 rue Jeanne Marvig, 31055 Toulouse
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Thibon A, England J, Martinho M, Young VG, Frisch JR, Guillot R, Girerd JJ, Münck E, Que L, Banse F. Proton- and reductant-assisted dioxygen activation by a nonheme iron(II) complex to form an oxoiron(IV) intermediate. Angew Chem Int Ed Engl 2008; 47:7064-7. [PMID: 18677790 DOI: 10.1002/anie.200801832] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Aurore Thibon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR CNRS 8182, Laboratoire de Chimie Inorganique, Université Paris Sud 11, 91405 Orsay Cedex, France
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Thibon A, England J, Martinho M, Young V, Frisch J, Guillot R, Girerd JJ, Münck E, Que L, Banse F. Proton- and Reductant-Assisted Dioxygen Activation by a Nonheme Iron(II) Complex to Form an Oxoiron(IV) Intermediate. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801832] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Martinho M, Dorlet P, Rivière E, Thibon A, Ribal C, Banse F, Girerd JJ. Preparation and Characterization of a Microcrystalline Non-Heme FeIII(OOH) Complex Powder: EPR Reinvestigation of FeIII(OOH) Complexes—Improvement of the Perturbation Equations for theg Tensor of Low-Spin FeIII. Chemistry 2008; 14:3182-8. [DOI: 10.1002/chem.200701592] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Martinho M, Banse F, Sainton J, Philouze C, Guillot R, Blain G, Dorlet P, Lecomte S, Girerd JJ. Fe(II) Mononuclear Complexes with a New Aminopyridyl Ligand Bearing a Pivaloylamido Arm. Preparation and Spectroscopic Characterizations of a FeIII-Hydroperoxo Complex with Oxygen and Nitrogen Donors. Inorg Chem 2007; 46:1709-17. [PMID: 17286400 DOI: 10.1021/ic0623415] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two new mononuclear FeII complexes, [(L52aH)FeII](PF6)2 (1-(PF6)2) and [(L52a)FeII]BPh4 (2-(BPh4)) have been synthesized with the new aminopyridyl ligand bearing a pivaloylamido arm L52aH (2,2-dimethyl-N-[6-({[2-(methyl-pyridin-2-ylmethyl-amino)-ethyl]-pyridin-2-ylmethyl-amino}-methyl)-pyridin-2-yl]-propionamide), or its deprotonated form L52a-. The structures of the ferrous complexes have been determined by X-ray analysis. The mononuclear FeII is in a pseudo-octahedral environment in both complexes, the six positions around the metal center being occupied by five nitrogen atoms and one oxygen atom from the ligand. Whatever the protonation state of the amide function, the structures are very similar, the FeII being 6-fold coordinated by the two amines, three pyridines, and the oxygen atom from the ligand. These two complexes exhibit an acid/base equilibrium in solution that has been studied by UV-vis spectroscopy and cyclic voltammetry in acetonitrile. The reactivity of 1-(PF6)2 with H2O2 in methanol affords the formation of a new low-spin FeIII(OOH) intermediate in which the oxygen atom is retained in the coordination sphere of the metal.
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Affiliation(s)
- Marlène Martinho
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR 8182, Laboratoire de Chimie Inorganique, Université Paris-XI, 91405 Orsay Cedex, France
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Anderlund MF, Zheng J, Ghiladi M, Kritikos M, Rivière E, Sun L, Girerd JJ, Åkermark B. A new, dinuclear high spin manganese(III) complex with bridging phenoxy and methoxy groups. Structure and magnetic properties. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.07.025] [Citation(s) in RCA: 11] [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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Affiliation(s)
- Jean-Jacques Girerd
- a Laboratoire de Spectrochimie des Elements de Transition , Université de Paris-Sud , 91405 , Orsay , France
| | - Marie-France Charlot
- a Laboratoire de Spectrochimie des Elements de Transition , Université de Paris-Sud , 91405 , Orsay , France
| | - Olivier Kahn
- a Laboratoire de Spectrochimie des Elements de Transition , Université de Paris-Sud , 91405 , Orsay , France
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Hureau C, Charlet L, Dorlet P, Gonnet F, Spadini L, Anxolabéhère-Mallart E, Girerd JJ. A spectroscopic and voltammetric study of the pH-dependent Cu(II) coordination to the peptide GGGTH: relevance to the fifth Cu(II) site in the prion protein. J Biol Inorg Chem 2006; 11:735-44. [PMID: 16758168 DOI: 10.1007/s00775-006-0118-5] [Citation(s) in RCA: 50] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Accepted: 05/05/2006] [Indexed: 11/24/2022]
Abstract
The GGGTH sequence has been proposed to be the minimal sequence involved in the binding of a fifth Cu(II) ion in addition to the octarepeat region of the prion protein (PrP) which binds four Cu(II) ions. Coordination of Cu(II) by the N- and C-protected Ac-GGGTH-NH(2) pentapeptide (P(5)) was investigated by using potentiometric titration, electrospray ionization mass spectrometry, UV-vis spectroscopy, electron paramagnetic resonance (EPR) spectroscopy and cyclic voltammetry experiments. Four different Cu(II) complexes were identified and characterized as a function of pH. The Cu(II) binding mode switches from NO(3) to N(4) for pH values ranging from 6.0 to 10.0. Quasi-reversible reduction of the [Cu(II)(P(5))H(-2)] complex formed at pH 6.7 occurs at E (1/2)=0.04 V versus Ag/AgCl, whereas reversible oxidation of the [Cu(II)(P(5))H(-3)](-) complex formed at pH 10.0 occurs at E (1/2)=0.66 V versus Ag/AgCl. Comparison of our EPR data with those of the rSHaPrP(90-231) (Burns et al. in Biochemistry 42:6794-6803, 2003) strongly suggests an N(3)O binding mode at physiological pH for the fifth Cu(II) site in the protein.
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Affiliation(s)
- Christelle Hureau
- Laboratoire de Géophysique Interne et Tectonophysique, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France.
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Enachescu C, Hauser A, Girerd JJ, Boillot ML. Photoexcitation and Relaxation Dynamics of Catecholato–Iron(III) Spin-Crossover Complexes. Chemphyschem 2006; 7:1127-35. [PMID: 16586423 DOI: 10.1002/cphc.200500671] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The photophysical properties of the ferric catecholate spin-crossover compounds [(TPA)Fe(R-Cat)]X (TPA=tris(2-pyridylmethyl)amine; X=PF(6) (-), BPh(4) (-); R-Cat=catecholate dianion substituted by R=NO(2), Cl, or H) are investigated in the solid state. The catecholate-to-iron(III) charge-transfer bands are sensitive both to the spin state of the metal ion and the charge-transfer interactions associated with the different catecholate substituents. Vibronic progressions are identified in the near-infrared (NIR) absorption of the low-spin species. Evidence for a low-temperature photoexcitation process is provided. The relaxation dynamics between 10 and 100 K indicate a pure tunneling process below approximately 40 K, and a thermally activated region at higher temperatures. The relaxation rate constants in the tunneling regime at low temperature, k(HL)(T-->0), vary in the range from 0.58 to 8.84 s(-1). These values are in qualitative agreement with the inverse energy-gap law and with structural parameters. A comparison with ferrous spin-crossover complexes shows that the high-spin to low-spin relaxation is generally faster for ferric complexes, owing to the smaller bond length changes for the latter. However, in the present case the corresponding rate constants are smaller than expected based on the single configurational coordinate model. This is attributed to the combined influence of the electronic configuration and the molecular geometry.
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Affiliation(s)
- Cristian Enachescu
- Faculty of Physics, Department of Solid State and Theoretical Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
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Martinho M, Banse F, Bartoli JF, Mattioli TA, Battioni P, Horner O, Bourcier S, Girerd JJ. New Example of a Non-Heme Mononuclear Iron(IV) Oxo Complex. Spectroscopic Data and Oxidation Activity. Inorg Chem 2005; 44:9592-6. [PMID: 16323949 DOI: 10.1021/ic051213y] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The green complex S=1 [(TPEN)FeO]2+ [TPEN=N,N,N',N'-tetrakis(2-pyridylmethyl)ethane-1,2-diamine] has been obtained by treating the [(TPEN)Fe]2+ precursor with meta-chloroperoxybenzoic acid (m-CPBA). This high-valent complex belongs to the emerging family of synthetic models of Fe(IV)=O intermediates invoked during the catalytic cycle of biological systems. This complex exhibits spectroscopic characteristics that are similar to those of other models reported recently with a similar amine/pyridine environment. Thanks to its relative stability, vibrational data in solution have been obtained by Fourier transform infrared. A comparison of the Fe=O and Fe=(18)O wavenumbers reveals that the Fe-oxo vibration is not a pure one. The ability of the green complex to oxidize small organic molecules has been studied. Mixtures of oxygenated products derived from two- or four-electron oxidations are obtained. The reactivity of this [FeO]2+ complex is then not straightforward, and different mechanisms may be involved.
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Affiliation(s)
- Marlène Martinho
- Laboratoire de Chimie Inorganique, UMR 8613, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, 91405 Orsay Cedex, France
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Albela B, Carina R, Policar C, Poussereau S, Cano J, Guilhem J, Tchertanov L, Blondin G, Delroisse M, Girerd JJ. Synthesis and X-ray Structure of the MnIICl2 and MnIIIF2 Complexes of N,N‘-Dimethyl-2,11-diaza[3,3](2,6)pyridinophane. High-Field Electron Paramagnetic Resonance and Density Funtional Theory Studies of the Mn(III) Complex. Evidence for a Low-Lying Spin Triplet State. Inorg Chem 2005; 44:6959-66. [PMID: 16180857 DOI: 10.1021/ic048302f] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Two manganese complexes, (py2(NMe)2)MnIICl2 (1) and [(py2(NMe)2)MnIIIF2]+ (2), are here described with the macrocyclic ligand py2(NMe)2 (py2(NMe)2 = N,N'-dimethyl-2,11-diaza[3,3](2,6)pyridinophane). For both, the crystal structure is reported. The UV-visible spectrum of 2 exhibits a very broad near-infrared (NIR) band corresponding to the transition between the two e(g)-type orbitals split by the Jahn-Teller effect. A negative D value of ca. -4 cm(-1) was estimated by high-field and high-frequency electron paramagnetic resonance (HF-EPR) spectroscopy, which was consistent with symmetry considerations. Density functional theory (DFT) calculations on 2 support the 5B1 electronic ground state predicted from the X-ray structure. Moreover, to explain the large value of the D parameter, a spin triplet first excited spin state was postulated to occur at low energy. This was confirmed by the DFT calculations.
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Affiliation(s)
- Belén Albela
- Laboratoire de Chimie Inorganique, UMR 8613, UMR 8124, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, France
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Simaan AJ, Boillot ML, Carrasco R, Cano J, Girerd JJ, Mattioli TA, Ensling J, Spiering H, Gütlich P. Electronic, Vibrational, and Structural Properties of a Spin-Crossover Catecholato-Iron System in the Solid State: Theoretical Study of the Electronic Nature of the Doublet and Sextet States. Chemistry 2005; 11:1779-93. [PMID: 15669047 DOI: 10.1002/chem.200400484] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
As a functional model of the catechol dioxygenases, [(TPA)Fe(Cat)]BPh4 (TPA = tris(2-pyridylmethyl)amine and Cat = catecholate dianion) exhibits the purple-blue coloration indicative of some charge transfer within the ground state. In contrast to a number of high-spin bioinspired systems, it was previously shown that, in the solid state, [(TPA)Fe(Cat)]BPh4 undergoes a two-step S = 1/2 = S = 5/2 spin-crossover. Therefore, the electronic and vibrational characteristics of this compound were investigated in the solid state by UV/Vis absorption and resonance Raman spectroscopies over the temperature range of the transition. This allowed the charge-transfer transitions of the low-spin (LS) form to be identified. In addition, the vibrational progression observed in the NIR absorption of the LS form was assigned to a five-membered chelate ring mode. The X-ray crystal structure solved at two different temperatures, shows the presence of highly distorted pseudo-octahedral ferric complexes that occupy two nonequivalent crystalline sites. The variation of the molecular parameters as a function of temperature strongly suggests that the two-step transition proceeds by a successive transition of the species in the two nonequivalent sites. The thermal dependence of the high-spin fraction of metal ions determined by Mössbauer experiments is consistent with the magnetic data, except for slight deviations in the high temperature range. The optimized geometries, the electronic transitions, vibrational frequencies, and thermodynamic functions were calculated with the B3LYP density functional method for the doublet and the sextet states. The finding of a ground state that possesses a significant mixture of Fe(III)-catecholate and FeII-semiquinonate configurations is discussed with regard to the set of experimental and theoretical data.
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Affiliation(s)
- A Jalila Simaan
- Laboratoire de Chimie Inorganique, UMR 8613, ICMMO, Bât 420, Université Paris-Sud, 91405 Orsay, France
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Yano J, Sauer K, Girerd JJ, Yachandra VK. Single crystal X- and Q-band EPR spectroscopy of a binuclear Mn(2)(III,IV) complex relevant to the oxygen-evolving complex of photosystem II. J Am Chem Soc 2004; 126:7486-95. [PMID: 15198595 PMCID: PMC3960403 DOI: 10.1021/ja038218j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The anisotropic g and hyperfine tensors of the Mn di-micro-oxo complex, [Mn(2)(III,IV)O(2)(phen)(4)](PF(6))(3).CH(3)CN, were derived by single-crystal EPR measurements at X- and Q-band frequencies. This is the first simulation of EPR parameters from single-crystal EPR spectra for multinuclear Mn complexes, which are of importance in several metalloenzymes; one of them is the oxygen-evolving complex in photosystem II (PS II). Single-crystal [Mn(2)(III,IV)O(2)(phen)(4)](PF(6))(3).CH(3)CN EPR spectra showed distinct resolved (55)Mn hyperfine lines in all crystal orientations, unlike single-crystal EPR spectra of other Mn(2)(III,IV) di-micro-oxo bridged complexes. We measured the EPR spectra in the crystal ab- and bc-planes, and from these spectra we obtained the EPR spectra of the complex along the unique a-, b-, and c-axes of the crystal. The crystal orientation was determined by X-ray diffraction and single-crystal EXAFS (Extended X-ray Absorption Fine Structure) measurements. In this complex, the three crystallographic axes, a, b, and c, are parallel or nearly parallel to the principal molecular axes of Mn(2)(III,IV)O(2)(phen)(4) as shown in the crystallographic data by Stebler et al. (Inorg. Chem. 1986, 25, 4743). This direct relation together with the resolved hyperfine lines significantly simplified the simulation of single-crystal spectra in the three principal directions due to the reduction of free parameters and, thus, allowed us to define the magnetic g and A tensors of the molecule with a high degree of reliability. These parameters were subsequently used to generate the solution EPR spectra at both X- and Q-bands with excellent agreement. The anisotropic g and hyperfine tensors determined by the simulation of the X- and Q-band single-crystal and solution EPR spectra are as follows: g(x) = 1.9887, g(y) = 1.9957, g(z) = 1.9775, and hyperfine coupling constants are A(III)(x) = |171| G, A(III)(y) = |176| G, A(III)(z) = |129| G, A(IV)(x) = |77| G, A(IV)(y) = |74| G, A(IV)(z) = |80| G.
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Hureau C, Blanchard S, Nierlich M, Blain G, Rivière E, Girerd JJ, Anxolabéhère-Mallart E, Blondin G. Controlled Redox Conversion of New X-ray-Characterized Mono- and Dinuclear Heptacoordinated Mn(II) Complexes into Di-μ-oxo-dimanganese Core Complexes. Inorg Chem 2004; 43:4415-26. [PMID: 15236555 DOI: 10.1021/ic035332u] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two heptacoordinated Mn(II) complexes are isolated and X-ray characterized using the well-known tpen ligand (tpen = N,N,N',N'-tetrakis(2-pyridylmethyl)-1,2-ethanediamine): [(tpen)Mn(OH(2))](ClO(4))(2) (1(ClO(4))(2)) and [(tpen)Mn(micro-OAc)Mn(tpen)](ClO(4))(3).2H(2)O (2(ClO(4))(3).2H(2)O). Crystallographic data for 1(ClO(4))(2) at 110(2) K (respectively at 293(2) K): monoclinic, space group C2/c, a = 15.049(3) A (15.096(3) A), b = 9.932(2) A (10.105(2) A), c = 19.246(4) A (19.443(4) A), beta = 94.21(3) degrees (94.50(3) degrees ), Z = 4. Crystallographic data for 2(ClO(4))(3).0.5(C(2)H(5))(2)O at 123(2) K: triclinic, space group P, a = 12.707(3) A, b = 12.824(3) A, c = 19.052(4) A, alpha = 102.71(3) degrees, beta = 97.83(3) degrees, gamma = 98.15(3) degrees, Z = 2. Investigation of the variation upon temperature of the molar magnetic susceptibility of compound 2(ClO(4))(3).2H(2)O reveals a weak antiferromagnetic exchange interaction between the two high-spin Mn(II) ions (J = -0.65 +/- 0.05 cm(-)(1), H = -JS(1).S(2)). EPR spectra are recorded on powder samples and on frozen acetonitrile solutions, demonstrating the maintenance upon dissolution of the heptacoordination of Mn in complex 1 while complex 2 partially dissociates. Electrochemical responses of complexes 1 and 2 are investigated in acetonitrile, and bulk electrolyses are performed at oxidative potential in the presence of various amounts of 2,6-lutidine (0-2.65 equiv per Mn ion). The formation from either 1 or 2 of the mixed-valent complex [(tpen)Mn(III)(micro-O)(2)Mn(IV)(tpen)](3+) (3) is established from mass spectrometry and EPR and IR spectroscopy measurements. When reaction is started from 2, formation of [(tpen)Mn(IV)(micro-O)(2)(micro-OAc)Mn(IV)](3+) (4) is evidenced from cyclic voltammetry, EPR, and UV-vis data. The Mn vs tpen ratio in the electrogenerated complexes is accurately controlled by the quantity of additional 2,6-lutidine. The role of tpen as a base is discussed.
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Affiliation(s)
- Christelle Hureau
- Laboratoire de Chimie Inorganique, UMR 8613, LCR-CEA n degrees 33V, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, 91405 Orsay Cedex, France
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Balland V, Anxolabéhère-Mallart E, Banse F, Rivière E, Bourcier S, Nierlich M, Girerd JJ. Synthesis, Structure and Characterizations in Solid State and Solution of Dinuclear Pentacoordinated FeII and MnII Complexes and of a Linear Tetranuclear FeIII Complex Obtained with the LigandN,N,N′,N′-Tetrakis[(6-methyl-2-pyridyl)methyl]propane-1,3-diamine. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300374] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Balland V, Charlot MF, Banse F, Girerd JJ, Mattioli T, Bill E, Bartoli JF, Battioni P, Mansuy D. Spectroscopic Characterization of an FeIV Intermediate Generated by Reaction of XO− (X = Cl, Br) with an FeII Complex Bearing a Pentadentate Non-Porphyrinic Ligand− Hydroxylation and Epoxidation Activity. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300287] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chibotaru LF, Girerd JJ, Blondin G, Glaser T, Wieghardt K. Electronic Structure of Linear Thiophenolate-Bridged Heteronuclear Complexes [LFeMFeL]n+ (M = Cr, Co, Fe; n = 1−3): A Combination of Kinetic Exchange Interaction and Electron Delocalization. J Am Chem Soc 2003; 125:12615-30. [PMID: 14531706 DOI: 10.1021/ja030027t] [Citation(s) in RCA: 16] [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: 11/30/2022]
Abstract
The electronic properties of the isostructural series of heterotrinuclear thiophenolate-bridged complexes of the general formula [LFeMFeL](n)(+) with M = Cr, Co and Fe where L represents the trianionic form of the ligand 1,4,7-tris(4-tertbutyl-2-mercaptobenzyl)-1,4,7-triazacyclononane, synthesized and investigated by a number of experimental techniques in the previous work(1), are subjected now to a theoretical analysis. The low-lying electronic excitations in these compounds are described within a minimal model supported by experiment and quantum chemistry calculations. It was found indeed that various experimental data concerning the magnetism and electron delocalization in the lowest states of all seven compounds are completely reproduced within a model which includes the electron transfer between magnetic orbitals at different metal centers and the electron repulsion in these orbitals (the Hubbard model). Moreover, due to the trigonal symmetry of the complexes, only the electron transfer between nondegenerate orbital, a(1), originating from the t(2g) shell of each metal ion in a pseudo-octahedral coordination, is relevant for the lowest states. An essential feature resulting from quantum chemistry calculations, allowing to explain the unusual magnetic properties of these compounds, is the surprisingly large value and, especially, the negative sign of the electron transfer between terminal iron ions, beta'. According to their electronic properties the series of complexes can be divided as follows: (1). The complexes [LFeFeFeL](3+) and [LFeCrFeL](3+) show localized valences in the ground electronic configuration. The strong antiferromagnetic exchange interaction and the resulting spin 1/2 of the ground-state arise from large values of the transfer parameters. (2). In the complex [LFeCrFeL](+), due to a higher energy of the magnetic orbital on the central Cr ion than on the terminal Fe ones, the spin 3/2 and the single unpaired a(1) electron are almost localized at the chromium center in the ground state. (3). The complex [LFeCoFeL](3+) has one ground electronic configuration in which two unpaired electrons are localized at terminal iron ions. The ground-state spin S = 1 arises from a kinetic mechanism involving the electron transfer between terminal iron ions as one of the steps. Such a mechanism, leading to a strong ferromagnetic interaction between distant spins, apparently has not been discussed before. (4). The complex [LFeFeFeL](2+) is characterized by both spin and charge degrees of freedom in the ground manifold. The stabilization of the total spin zero or one of the itinerant electrons depends on beta', i.e., corresponds to the observed S = 1 for its negative sign. This behavior does not fit into the double exchange model. (5). In [LFeCrFeL](2+) the delocalization of two itinerant holes in a(1) orbitals takes place over the magnetic core of chromium ion. Although the origin of the ground-state spin S = 2 is the spin dependent delocalization, the spectrum of the low-lying electronic states is again not of a double exchange type. (6). Finally, the complex [LFeCoFeL](2+) has the ground configuration corresponding to the electron delocalization between terminal iron atoms. The estimated magnitude of the corresponding electron transfer is smaller than the relaxation energy of the nuclear distortions induced by the electron localization at one of the centers, leading to vibronic valence trapping observed in this compound.
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Affiliation(s)
- Liviu F Chibotaru
- Laboratory of Quantum Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Belgium.
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Blanchard S, Blondin G, Rivière E, Nierlich M, Girerd JJ. X- and Q-band EPR studies of the dinuclear Mn(II) complex [(Bpmp)Mn2(mu-OAc)2]+. Determination of the spin parameters for the S = 1 and S = 2 spin states. Inorg Chem 2003; 42:4568-78. [PMID: 12870946 DOI: 10.1021/ic0301066] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new mu-phenoxo-bis-mu-acetato di-Mn(II) complex using the BpmpH ligand was isolated as a perchlorate salt (BpmpH = 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methyl-phenol). The X-ray structure has been solved showing that the two Mn(II) ions are in a distorted octahedral environment. Investigation of the variation of the molar magnetic susceptibility upon temperature reveals an antiferromagnetic exchange interaction between the two high-spin Mn(II) ions. Fitting of the experimental data led to g = 1.99 and J = 9.6 cm(-1) (H(HDvV) = JS(A).S(B)). EPR spectra recorded on a powder sample of [(Bpmp)Mn(2)(mu-OAc)(2)](ClO(4)).0.5H(2)O at X-band between 4.3 K and room temperature and at Q-band between 5 and 298 K are presented. A new method based on a scrupulous examination of the variation upon temperature of these experimental spectra is developed here to first assign the transitions to the relevant spin states and second to determine the associated spin parameters. This approach is compared to the deconvolution process that has been previously applied to dinuclear Mn(II) complexes or metalloenzyme active sites. Crystallographic data is as follows: triclinic, space group P one macro, a = 10.154(2) A, b = 12.0454(2) A, c = 17.743(4) A, alpha = 101.69(3) degrees, beta = 93.62(3) degrees, gamma = 94.67(3) degrees, Z = 2.
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Affiliation(s)
- Sébastien Blanchard
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, LRC-CEA n 33V, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud, 91405 Orsay Cedex, France.
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Balland V, Banse F, Anxolabéhère-Mallart E, Nierlich M, Girerd JJ. Iron Complexes Containing the Ligand N,N-Bis(6-methyl-2-pyridylmethyl)-N,N-bis(2-pyridylmethyl)ethane-1,2-diamine: Structural, Spectroscopic, and Electrochemical Studies, Reactivity with Hydrogen Peroxide and the Formation of a Low-Spin Fe−OOH Complex. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200200694] [Citation(s) in RCA: 30] [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: 11/08/2022]
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Balland V, Charlot MF, Banse F, Girerd JJ, Bill E, Bartoli JF, Battioni P, Mansuy D. Spectroscopic characterization of a Fe(IV) intermediate with a non-porphyrin ligand. Hydroxylation and epoxidation activity. J Inorg Biochem 2003. [DOI: 10.1016/s0162-0134(03)80559-7] [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: 10/26/2022]
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Balland V, Banse F, Anxolabéhère-Mallart E, Ghiladi M, Mattioli TA, Philouze C, Blondin G, Girerd JJ. Fe(II) and Fe(III) mononuclear complexes with a pentadentate ligand built on the 1,3-diaminopropane unit. Structures and spectroscopic and electrochemical properties. Reaction with H2O2. Inorg Chem 2003; 42:2470-7. [PMID: 12665386 DOI: 10.1021/ic025905n] [Citation(s) in RCA: 55] [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: 11/28/2022]
Abstract
Two new iron complexes, [L(5)(3)Fe(II)Cl]PF(6) (1.PF(6)) and [(L(5)(3)H(+))Fe(III)Cl(3)]PF(6) (2.PF(6)), were synthesized (L(5)(3) = N-methyl-N,N',N'-tris(2-pyridylmethyl)propane-1,3-diamine), and their molecular structures were determined by X-ray crystallography. Their behavior in solution was studied by UV-vis spectroscopy and electrochemistry. Upon addition of a base to an acetonitrile solution of 2, the new unsymmetrical dinuclear complex [L(5)(3)Fe(III)OFe(III)Cl(3)](+) was detected. Treating 1 with hydrogen peroxide has allowed us to detect the low spin [L(5)(3)Fe(III)OOH](2+). Its spectroscopic properties (UV-vis, EPR and resonance Raman) are similar to those reported for related FeOOH complexes obtained with amine/pyridine ligands. Using stopped-flow absorption spectroscopy, the formation and degradation of [L(5)(3)Fe(III)OOH](2+) has been monitored, and a mechanism is proposed to reproduce the kinetic data.
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Affiliation(s)
- Véronique Balland
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, Université Paris-Sud, 91405 Orsay, France
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Salmon L, Thuéry P, Rivière E, Girerd JJ, Ephritikhine M. Structure and magnetism of the first strictly dinuclear compound containing paramagnetic 3d and 5f metal ions. Major influence of the Cu(II) ion coordination on the exchange Cu(II)-U(IV) interaction. Chem Commun (Camb) 2003:762-3. [PMID: 12703811 DOI: 10.1039/b212635d] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [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 dinuclear compound [CuL2(py)U(acac)2] has been synthesized by treating [Cu(H2L2)] with U(acac)4 (L2 = N,N'-bis(3-hydroxysalicylidene)-2-methyl-1,2-propanediamine) and shows the antiferromagnetic Cu-U interaction; the distinct magnetic behaviour of the trinuclear complexes [(CuL2)2U] (antiferromagnetic) and [[CuL1(py)]U[CuL1]] (ferromagnetic) revealed the major influence of the Cu(II) ion coordination on the exchange interaction (L1 = N,N'-bis(3-hydroxysalicylidene)-2,2-dimethyl-1,3-propanediamine).
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Affiliation(s)
- Lionel Salmon
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA Saclay, 91191 Gif-sur-Yvette, France
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Salmon L, Thuéry P, Rivière E, Girerd JJ, Ephritikhine M. Versatility of the nature of the magnetic Cu(ii)–U(iv) interaction. Syntheses, crystal structures and magnetic properties of Cu2U and CuU compounds. Dalton Trans 2003. [DOI: 10.1039/b304414a] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [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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Raffard-Pons Y Moll N, Banse F, Miki K, Nierlich M, Girerd JJ. Hydroxylation of Hexane Using Dioxygen and Trimethylhydroquinone: Biomimetic Catalysis by an Unsymmetrical Diiron-μ-Oxo Complex. Eur J Inorg Chem 2002. [DOI: 10.1002/1099-0682(200208)2002:8<1941::aid-ejic1941>3.0.co;2-b] [Citation(s) in RCA: 21] [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: 11/09/2022]
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Bominaar EL, Borshch. Serguei A., Girerd JJ. Double-Exchange and Vibronic Coupling in Mixed-Valence Systems. Electronic Structure of [Fe4S4]3+ Clusters in High-Potential Iron Protein and Related Models. J Am Chem Soc 2002. [DOI: 10.1021/ja00091a047] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [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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Bominaar EL, Borshch SA, Girerd JJ. Double-Exchange and Vibronic Coupling in Mixed-Valence Systems. Electronic Structure of [Fe4S4]3+ Clusters in High-Potential Iron Protein and Related Models. [Erratum to document cited in CA121:3500]. J Am Chem Soc 2002. [DOI: 10.1021/ja00096a089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Philouze C, Blondin G, Girerd JJ, Guilhem J, Pascard C, Lexa D. Aqueous Chemistry of High-Valent Manganese. Structure, Magnetic, and Redox Properties of a New Type of Mn-Oxo Cluster, [Mn4IVO4(bpy)6]4+: Relevance to the Oxygen Evolving Center in Plants. J Am Chem Soc 2002. [DOI: 10.1021/ja00098a016] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [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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Bominaar EL, Hu Z, Muenck E, Girerd JJ, Borshch SA. Double Exchange and Vibronic Coupling in Mixed-Valence Systems. Electronic Structure of Exchange-Coupled Siroheme-[Fe4S4]2+ Chromophore in Oxidized E. Coli Sulfite Reductase. J Am Chem Soc 2002. [DOI: 10.1021/ja00131a021] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Le Borgne T, Rivière E, Marrot J, Thuéry P, Girerd JJ, Ephritikhine M. Syntheses, X-ray crystal structures, and magnetic properties of novel linear M2[II]U[IV] complexes (M=Co, Ni, Cu, Zn). Chemistry 2002; 8:773-83. [PMID: 11857691 DOI: 10.1002/1521-3765(20020215)8:4<773::aid-chem773>3.0.co;2-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Attempts to prepare heterobimetallic complexes in which 3d and uranium magnetic ions are associated by means of the Schiff bases H(2)L(i) derived from 2-hydroxybenzaldehyde or 2-hydroxy-3-methoxybenzaldehyde were unsuccessful because of ligand transfer reactions between [ML(i)] (M=Co, Ni, Cu) and UCl(4) that led to the mononuclear Schiff base complexes of uranium [UL(i)Cl(2)]. The crystal structure of [UL(3)Cl(2)(py)(2)] [L(3)=N,N'-bis(3-methoxysalicylidene)-ethylenediamine; py=pyridine] was determined. The hexadentate Schiff base ligand N,N'-bis(3-hydroxysalicylidene)-2,2-dimethyl-1,3-propanediamine (L) was useful for the synthesis of novel trinuclear complexes of the general formula [[ML(py)](2)U] (M=Co, Ni, Zn) or [[CuL(py)]M'[CuL]] (M'=U, Th, Zr) by reaction of [M(H(2)L)] with [M'(acac)(4)] (acac=MeCOCHCOMe). The crystal structures of the Co(2)U, Ni(2)U, Zn(2)U, Cu(2)U, and Cu(2)Th complexes show that the two ML fragments are orthogonal, being linked to the central actinide ion by the two pairs of oxygen atoms of the Schiff base ligand. In each compound, the UO(8) core exhibits the same dodecahedral geometry, and the three metals are linear. The magnetic study indicated that the two Cu(2+) ions are not coupled in the Cu(2)Zr and Cu(2)Th compounds. The magnetic behavior of the Co(2)U, Ni(2)U, and Cu(2)U complexes was compared with that of the Zn(2)U derivative, in which the paramagnetic 3d ion was replaced with the diamagnetic Zn(2+) ion. A weak antiferromagnetic coupling was observed between the Ni(2+) and the U(4+) ions, while a ferromagnetic interaction was revealed between the Cu(2+) and U(4+) ions.
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Affiliation(s)
- Thierry Le Borgne
- Service de Chimie Moléculaire Bât. 125, DSM, DRECAM, CNRS URA 331, CEA Saclay 91191 Gif-sur-Yvette, France
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Raffard N, Balland V, Simaan J, Létard S, Nierlich M, Miki K, Banse F, Anxolabéhère-Mallart E, Girerd JJ. Bio-inspired iron catalysts for degradation of aromatic pollutants and alkane hydroxylation. CR CHIM 2002. [DOI: 10.1016/s1631-0748(02)01359-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Simaan AJ, Banse F, Girerd JJ, Wieghardt K, Bill E. The electronic structure of non-heme iron(III)-hydroperoxo and iron(III)-peroxo model complexes studied by Mössbauer and electron paramagnetic resonance spectroscopies. Inorg Chem 2001; 40:6538-40. [PMID: 11735458 DOI: 10.1021/ic010635e] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A J Simaan
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, Université Paris-Sud, F-91405 Orsay, France
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Raffard N, Carina R, Simaan A, Sainton J, Rivière E, Tchertanov L, Bourcier S, Bouchoux G, Delroisse M, Banse F, Girerd JJ. Biomimetic Catalysis of Catechol Cleavage by O2 in Organic Solvents − Role of Accessibility of O2 to FeIII in 2,11-Diaza[3,3](2,6)pyridinophane-Type Catalysts. Eur J Inorg Chem 2001. [DOI: 10.1002/1099-0682(200109)2001:9<2249::aid-ejic2249>3.0.co;2-3] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Visser H, Anxolabéhère-Mallart E, Bergmann U, Glatzel P, Robblee JH, Cramer SP, Girerd JJ, Sauer K, Klein MP, Yachandra VK. Mn K-edge XANES and Kbeta XES studies of two Mn-oxo binuclear complexes: investigation of three different oxidation states relevant to the oxygen-evolving complex of photosystem II. J Am Chem Soc 2001; 123:7031-9. [PMID: 11459481 PMCID: PMC3959873 DOI: 10.1021/ja004306h] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two structurally homologous Mn compounds in different oxidation states were studied to investigate the relative influence of oxidation state and ligand environment on Mn K-edge X-ray absorption near-edge structure (XANES) and Mn Kbeta X-ray emission spectroscopy (Kbeta XES). The two manganese compounds are the di-mu-oxo compound [L'2Mn(III)O2Mn(IV)L'2](ClO4)3, where L' is 1,10-phenanthroline (Cooper, S. R.; Calvin, M. J. Am. Chem. Soc. 1977, 99, 6623-6630) and the linear mono-mu-oxo compound [LMn(III)OMn(III)L](ClO4)2, where L- is the monoanionic N,N-bis(2-pyridylmethyl)-N'-salicylidene-1,2-diaminoethane ligand (Horner, O.; Anxolabéhère-Mallart, E.; Charlot, M. F.; Tchertanov, L.; Guilhem, J.; Mattioli, T. A.; Boussac, A.; Girerd, J.-J. Inorg. Chem. 1999, 38, 1222-1232). Preparative bulk electrolysis in acetonitrile was used to obtain higher oxidation states of the compounds: the Mn(IV)Mn(IV) species for the di-mu-oxo compound and the Mn(III)Mn(IV) and Mn(IV)Mn(IV) species for the mono-mu-oxo compound. IR, UV/vis, EPR, and EXAFS spectra were used to determine the purity and integrity of the various sample solutions. The Mn K-edge XANES spectra shift to higher energy upon oxidation when the ligand environment remains similar. However, shifts in energy are also observed when only the ligand environment is altered. This is achieved by comparing the di-mu-oxo and linear mono-mu-oxo Mn-Mn moieties in equivalent oxidation states, which represent major structural changes. The magnitude of an energy shift due to major changes in ligand environment can be as large as that of an oxidation-state change. Therefore, care must be exercised when correlating the Mn K-edge energies to manganese oxidation states without taking into account the nature of the ligand environment and the overall structure of the compound. In contrast to Mn K-edge XANES, Kbeta XES spectra show less dependence on ligand environment. The Kbeta1,3 peak energies are comparable for the di-mu-oxo and mono-mu-oxo compounds in equivalent oxidation states. The energy shifts observed due to oxidation are also similar for the two different compounds. The study of the different behavior of the XANES pre-edge and main-edge features in conjunction with Kbeta XES provides significant information about the oxidation state and character of the ligand environment of manganese atoms.
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Affiliation(s)
- Hendrik Visser
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Chemistry, University of California, Berkeley, California 94720-5230
| | - Elodie Anxolabéhère-Mallart
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, Université de Paris-Sud, 91405 Orsay, France
| | - Uwe Bergmann
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Applied Science, University of California, Davis, California 95616
| | - Pieter Glatzel
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Applied Science, University of California, Davis, California 95616
| | - John H. Robblee
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Chemistry, University of California, Berkeley, California 94720-5230
| | - Stephen P. Cramer
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Applied Science, University of California, Davis, California 95616
| | - Jean-Jacques Girerd
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, Université de Paris-Sud, 91405 Orsay, France
| | - Kenneth Sauer
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Department of Chemistry, University of California, Berkeley, California 94720-5230
| | - Melvin P. Klein
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Vittal K. Yachandra
- Melvin Calvin Laboratory, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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Albela B, Chottard G, Girerd JJ. Biomimetic approach to the oxygen evolving center: resonance Raman investigation of a manganese mu-oxo dimer in three oxidation states. J Biol Inorg Chem 2001; 6:430-4. [PMID: 11372201 DOI: 10.1007/s007750100220] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A biologically relevant dinuclear manganese mono-mu-oxo complex with a bound phenolate ligand in three oxidation states, (III,III), (III,IV) and (IV,IV), was studied using resonance Raman spectroscopy. Depending upon the excitation frequency, phenolate vibrations or mu-oxo vibrations were enhanced, which allowed us to assign the UV-visible absorption spectra. In the case of the mixed valence species (III,IV), the mu-oxo vibration at 854 cm-1 has been assigned by isotopic substitution (H2(18)O) to nu as(Mn-O-Mn). This preferential enhancement of the asymmetric vibration stresses the asymmetric character of the bridge.
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Affiliation(s)
- B Albela
- Laboratoire de Chimie Inorganique et Matériaux Moléculaires, ESA CNRS 7071, Université Pierre et Marie Curie, 75252 Paris cedex 05, France
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Poussereau S, Blondin G, Chottard G, Guilhem J, Tchertanov L, Rivière E, Girerd JJ. Synthesis, Structure and Characterization of the New Complex [L1(H2O)Fe(μ-O)Fe(OH2)L1]4+ [L1 =N,N′-Bis(1-methylimidazolyl-2-methyl)-N,N′-Bismethyl-1,2-ethanediamine] − Formation of the (μ-O)(μ-H3O2) Complex upon Deprotonation. Eur J Inorg Chem 2001. [DOI: 10.1002/1099-0682(200104)2001:4<1057::aid-ejic1057>3.0.co;2-a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Rogez G, Marvilliers A, Rivière E, Audière JP, Lloret F, Varret F, Goujon A, Mendenez N, Girerd JJ, Mallah T. A Mixed-Valence Mixed-Spin Prussian-Blue-Like Heptanuclear Complex. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3773(20000818)39:16<2885::aid-anie2885>3.0.co;2-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rogez G, Marvilliers A, Rivière E, Audière JP, Lloret F, Varret F, Goujon A, Mendenez N, Girerd JJ, Mallah T. A Mixed-Valence Mixed-Spin Prussian-Blue-Like Heptanuclear Complex. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000818)112:16<3007::aid-ange3007>3.0.co;2-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Simaan A, Döpner S, Banse F, Bourcier S, Bouchoux G, Boussac A, Hildebrandt P, Girerd JJ. FeIII-Hydroperoxo and Peroxo Complexes with Aminopyridyl Ligands and the Resonance Raman Spectroscopic Identification of the Fe−O and O−O Stretching Modes. Eur J Inorg Chem 2000. [DOI: 10.1002/1099-0682(200007)2000:7<1627::aid-ejic1627>3.0.co;2-9] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mialane P, Tchertanov L, Banse F, Sainton J, Girerd JJ. Aminopyridine iron catecholate complexes as models for intradiol catechol dioxygenases. Synthesis, structure, reactivity, and spectroscopic studies. Inorg Chem 2000; 39:2440-4. [PMID: 11196993 DOI: 10.1021/ic981236v] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four new Fe(III) catecholate complexes, [(bispicMe2en)FeIII(DBC)]+, [(bispicCl2Me2en)FeIII(DBC)]+, [(trispicMeen)FeIII(DBC)]+, and [(BQPA)FeIII(DBC)]+, which all contain aminopyridine ligands, were synthesized. The structure of [(bispicMe2en)FeIII(DBC)]+ was determined by X-ray diffraction. It crystallizes in the triclinic space group P1 with a = 10.666(3) A, b = 13.467(5) A, c = 17.685(2) A, alpha = 93.46(2) degrees, beta = 93.68(2) degrees, gamma = 109.0(3) degrees, V = 2387.4 A3, and Z = 2. All of these complexes were found to be active toward oxidation of catechol by O2 in DMF at 20 degrees C to afford intradiol cleavage products. The catechol was quantitatively oxidized, mainly (90%) into 3,5-di-tert-butyl-5-(carboxymethyl)-2-furanone. Reaction rates were measured, and for the first three (topologically similar) complexes, a correlation of the second-order kinetic constants k with the optical parameters of the two LMCT O(DBC)-->Fe(III) bands was found. In particular, k increases with the epsilon max of the charge-transfer bands. The k value of the complex [(BQPA)FeIII(DBC)]+, containing a tripodal ligand, is smaller than expected on the basis of these correlations. This discrepancy could be related to steric hindrance induced by the BQPA ligand. However, the much lower activity of the bispicen-Fe(III)-type complexes compared to that of the [(TPA)FeIII(DBC)]+ complex synthesized by Jang et al. (J. Am. Chem. Soc. 1991, 113, 9200-9204), despite similar epsilon max values, shows that a knowledge of optical and NMR parameters values is not sufficient to explain the dioxygenase activity rate. In their study of protocatechuate 3,4-dioxygenase, Orville et al. (Biochemistry 1997, 36, 10052-10066) suggested that asymmetric chelation of the catecholate to Fe(III) is of great importance in the efficiency of the intradiol dioxygenase reaction. Indeed, a comparison of the X-ray structures of [(TPA)FeIII(DBC)]+ and [(bispicMe2en)FeIII(DBC)]+ shows that the Fe(III)-O bonds differ by 0.019 A in the former and are identical in the latter. Asymmetry could also play a role in the model complexes. An alternative explanation is the possible existence of a low-spin state for [(TPA)FeIII(DBC)]+, as recently identified in [(TPA)FeIII(cat)]+ by Simaan et al.
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Affiliation(s)
- P Mialane
- Laboratoire de Chimie Inorganique, UMR CNRS 8613, Institut de Chimie Moléculaire d'Orsay, Université Paris-Sud, 91405 Orsay, France
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Simaan J, Poussereau S, Blondin G, Girerd JJ, Defaye D, Philouze C, Guilhem J, Tchertanov L. Mononuclear Fe(II) and Fe(III) complexes with the tetradentate ligand N,N′-bisbenzyl-N,N′-bis(2-pyridylmethyl)-ethane-1,2-diamine. Synthesis and characterisation. Inorganica Chim Acta 2000. [DOI: 10.1016/s0020-1693(99)00502-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Mialane P, Girerd JJ, Guilhem J, Tchertanov L. Synthesis and structure of a new iron(III) complex with a doubly positively charged ligand. Oxidative study of the related catecholato adduct. Inorganica Chim Acta 2000. [DOI: 10.1016/s0020-1693(99)00406-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Greenaway FT, Riviere E, Girerd JJ, Labouze X, Morgant G, Viossat B, Daran JC, Roch Arveiller M, Dung NH. Copper(II) complexes of a nonsteroidal anti-inflammatory drug niflumic acid. Synthesis, crystal structure of tetrakis-mu-(2-[3-(trifluoromethyl) phenyl]aminonicotinato)bis(dimethylsulfoxide)-dicopper(II) complex at 190 K. Anti-inflammatory properties. J Inorg Biochem 1999; 76:19-27. [PMID: 10530003 DOI: 10.1016/s0162-0134(99)00104-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The synthesis and characterization of three complexes with a potent nonsteroidal anti-inflammatory drug niflumic acid {2-[3-(trifluoromethyl)phenyl]aminonicotinic acid} with formula [Cu(niflumato)2L] (L = H2O, DMSO = dimethylsulfoxide, DMF = N,N-dimethylformamide) were investigated. The crystal and molecular structure of the {Cu(niflumato)2(DMSO)}2 was reported. Crystallographic data are as follows: monoclinic system, space group P2(1)/n, Z = 2, a = 11.1318(8), b = 17.513(2), c = 15.336(1) A, beta = 103.316(8) degrees, V = 2909.4(4) A3. The structure was refined to R = 0.030 and wR = 0.037 for 3702 reflections with I > sigma (I). It consists of centrosymmetric binuclear units with the Cu-Cui (symmetry code i: 1-x, -y, 1-z) distance between two centrosymmetrically related ions of 2.6272(5) A. Each Cu(II) ion in [Cu2(DMSO)2(mu-niflumato)4] is coordinated to an apical dimethylsulfoxide O atom on the one hand and to the equatorial carbonyl and carboxylic O atoms of two crystallographically independent niflumate moieties and their centrosymmetric counterparts on the other hand. In spite of the low-temperature (190 K) crystal measurements, one L-CF3 grouping exhibits some disorder. The biological activities of these complexes were compared to that of niflumic acid. Niflumic acid and its various copper complexes significantly inhibited polymorphonuclear leukocyte (PMNL) oxidative metabolism, as assessed by chemiluminescence and O2- generation measurement. This effect was dose-dependent. All copper complexes exerted a similar inhibiting effect which was always significantly higher than that exerted by the parent drug.
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Affiliation(s)
- F T Greenaway
- Gustaf H. Carlson School of Chemistry, Clark University, Worcester, MA 01610, USA
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Horner O, Girerd JJ, Philouze C, Tchertanov L. A seven-coordinate manganese(II) complex formed with the single heptadentate ligand N,N,N′-tris(2-pyridylmethyl)-N′-(2-salicylideneethyl)ethane-1,2-diamine. Inorganica Chim Acta 1999. [DOI: 10.1016/s0020-1693(99)00113-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Simaan AJ, Banse F, Mialane P, Boussac A, Un S, Kargar-Grisel T, Bouchoux G, Girerd JJ. Characterization of a Nonheme Mononuclear Peroxoiron(III) Intermediate by UV/Vis and EPR Spectroscopy and Mass Spectrometry. Eur J Inorg Chem 1999. [DOI: 10.1002/(sici)1099-0682(199906)1999:6<993::aid-ejic993>3.0.co;2-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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