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Banerjee A, Gómez García CJ, Benmansour S, Gomlia RM, Frontera A, Chattopadhyay S. Field-induced single-molecule magnet behaviour in a series of dinuclear cobalt(III,II) complexes. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Hamdi I, Mhadhbi N, Issaoui N, Roodt A, Turnbull MM, Naϊli H. Design, synthesis and physico-chemical studies of a Co(II)/Co(III) mixed-valence complex: An experimental and DFT approach. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130384] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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3
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Haiduc I. Inverse coordination chemistry: oxocarbons, other polyoxo carbocyclic molecules and oxygen heterocycles as coordination centers. Topology and systematization. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1825697] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ionel Haiduc
- Facultatea de Chimie, Universitatea Babeş-Bolyai, Cluj-Napoca, Romania
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4
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Chandra S, Weisser F, Klenk S, Beerhues J, Schweinfurth D, Sarkar B. Dinuclear Ru II complexes with quinonoid bridges: tuning the electrochemical and spectroscopic properties of redox-switchable NIR dyes through judicious bridge design. Dalton Trans 2020; 49:8354-8366. [PMID: 32519683 DOI: 10.1039/d0dt01351j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Bridging quinonoid ligands are important platforms for generating metal-based switchable optoelectronic and magnetic materials. A possible sound way of influencing the properties of the aforementioned materials is to modify the direct metal-ligand interface. We present herein a series of dinuclear RuII complexes where the set of donor atoms at the bridging quinonoid ligands range from [O,O,O,O], [O,O,O,N], [O,N,O,N] and [O,N,O,N']. Additionally, the substituents on the N-donors were varied as well (a total of eight different quinonoid bridges are compared). We also present a mononuclear RuII complex for comparison purposes. The dinuclear complexes act as switchable NIR dyes, absorbing in the NIR region in their mixed-valent RuII/RuIII form but not in the neighboring RuII/RuII and RuIII/RuIII states. The switching potentials (the potentials at which NIR absorptions appear) and the λmax of the NIR band can be fine-tuned by varying the donor atoms as well as the electron-donating ability of the substituents on the nitrogen atoms (tuning E by ca. 0.4 V and λmax by ca. 450 nm). Introducing more electron-rich substituents at the nitrogen atoms of the bridge results in higher band energies and more cathodic redox potentials. Unsymmetrical bridging ligands increase the thermodynamic stability of the mixed-valent state. Whereas almost all of the mixed-valent species presented here belong to the delocalised type III of the Robin-Day classification, the most unsymmetrical complex 2O,N(Mes) shows characteristic signs of a borderline Class-II-III compounds. This comprehensive study thus establishes the lesser used unsymmetrically substituted quinones as excellent bridges for generating and tuning a series of properties in their corresponding metal complexes.
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Affiliation(s)
- Shubhadeep Chandra
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany.
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5
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Synthesis and characterization of mixed valence cobalt(III)/cobalt(II) complexes with N,O-donor Schiff base ligands. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.10.059] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Jeon IR, Sun L, Negru B, Van Duyne RP, Dincă M, Harris TD. Solid-State Redox Switching of Magnetic Exchange and Electronic Conductivity in a Benzoquinoid-Bridged MnII Chain Compound. J Am Chem Soc 2016; 138:6583-90. [DOI: 10.1021/jacs.6b02485] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ie-Rang Jeon
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Lei Sun
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
| | - Bogdan Negru
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Richard P. Van Duyne
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Mircea Dincă
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States
| | - T. David Harris
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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Deibel N, Hohloch S, Schweinfurth D, Weisser F, Grupp A, Sarkar B. Three-way cooperativity in d8 metal complexes with ligands displaying chemical and redox non-innocence. Chemistry 2014; 20:15178-87. [PMID: 25251147 DOI: 10.1002/chem.201403276] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Indexed: 01/19/2023]
Abstract
Reversible proton- and electron-transfer steps are crucial for various chemical transformations. The electron-reservoir behavior of redox non-innocent ligands and the proton-reservoir behavior of chemically non-innocent ligands can be cooperatively utilized for substrate bond activation. Although site-decoupled proton- and electron-transfer steps are often found in enzymatic systems, generating model metal complexes with these properties remains challenging. To tackle this issue, we present herein complexes [(cod-H)M(μ-L(2-)) M(cod-H)] (M = Pt(II), [1] or Pd(II), [2], cod = 1,5-cyclooctadiene, H2L = 2,5-di-[2,6-(diisopropyl)anilino]-1,4-benzoquinone), in which cod acts as a proton reservoir, and L(2-) as an electron reservoir. Protonation of [2] leads to an unusual tetranuclear complex. However, [1] can be stepwise reversibly protonated with up to two protons on the cod-H ligands, and the protonated forms can be stepwise reversibly reduced with up to two electrons on the L(2-) ligand. The doubly protonated form of [1] is also shown to react with OMe(-) leading to an activation of the cod ligands. The site-decoupled proton and electron reservoir sources work in tandem in a three-way cooperative process that results in the transfer of two electrons and two protons to a substrate leading to its double reduction and protonation. These results will possibly provide new insights into developing catalysts for multiple proton- and electron-transfer reactions by using metal complexes of non-innocent ligands.
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Affiliation(s)
- Naina Deibel
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart (Germany)
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Deibel N, Sommer MG, Hohloch S, Schwann J, Schweinfurth D, Ehret F, Sarkar B. Dinuclear Quinonoid-Bridged d8 Metal Complexes with Redox-Active Azobenzene Stoppers: Electrochemical Properties and Electrochromic Behavior. Organometallics 2014. [DOI: 10.1021/om500035c] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Naina Deibel
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Michael G. Sommer
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Stephan Hohloch
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Johannes Schwann
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - David Schweinfurth
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Fabian Ehret
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70569 Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
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11
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Schweinfurth D, Klein J, Hohloch S, Dechert S, Demeshko S, Meyer F, Sarkar B. Influencing the coordination mode of tbta (tbta = tris[(1-benzyl-1H-1,2,3-triazol-4-yl)methyl]amine) in dicobalt complexes through changes in metal oxidation states. Dalton Trans 2013; 42:6944-52. [DOI: 10.1039/c3dt00102d] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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12
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Nawn G, Waldie KM, Oakley SR, Peters BD, Mandel D, Patrick BO, McDonald R, Hicks RG. Redox-active bridging ligands based on indigo diimine ("Nindigo") derivatives. Inorg Chem 2011; 50:9826-37. [PMID: 21688798 DOI: 10.1021/ic200388y] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Reactions of indigo with a variety of substituted anilines produce the corresponding indigo diimines ("Nindigos") in good yields. Nindigo coordination complexes are subsequently prepared by reactions of the Nindigo ligands with Pd(hfac)(2). In most cases, binuclear complexes are obtained in which the deprotonated Nindigo bridges two Pd(hfac) moieties in the expected bis-bidentate binding mode. When the Nindigo possesses bulky substituents on the imine (mesityl, 2,6-dimethylphenyl, 2,6-diisopropylphenyl, etc.), mononuclear Pf(hfac) complexes are obtained in which the Nindigo core has isomerized from a trans- to a cis-alkene; in these structures, the palladium is bound to the cis-Nindigo ligand at the two indole nitrogen atoms; the remaining proton is bound between the imine nitrogen atoms. The palladium complexes possess intense electronic absorption bands [near 920 nm for the binuclear complexes and 820 nm for the mononuclear cis-Nindigo complexes; extinction coefficients are (1.0-2.0) × 10(4) M(-1) cm(-1)] that are ligand-centered (π-π*) transitions. Cyclic voltammetry investigations reveal multiple redox events that are also ligand-centered in origin. All of the palladium complexes can be reversibly oxidized in two sequential one-electron steps; the binuclear complexes are reduced in a two-electron process whose reversibility depends on the Nindigo ligand substituent; the mononuclear palladium species show two one-electron reductions, only the first of which is quasi-reversible.
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Affiliation(s)
- Graeme Nawn
- Department of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, British Columbia V8W 3V6, Canada
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Miller J, Min K. Oxidation Leading to Reduction: Redox-Induced Electron Transfer (RIET). Angew Chem Int Ed Engl 2009; 48:262-72. [DOI: 10.1002/anie.200705138] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Miller J, Min K. Oxidation führt zu Reduktion - redoxinduzierter Elektronentransfer (RIET). Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200705138] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Han YF, Lin YJ, Jia WG, Jin GX. Synthesis, Characterization, and Electrochemical Properties of Molecular Rectangles of Half-Sandwich Iridium Complexes Containing Bridging Chloranilate Ligands. Organometallics 2008. [DOI: 10.1021/om800426e] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ying-Feng Han
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai, 200433, People's Republic of China
| | - Yue-Jian Lin
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai, 200433, People's Republic of China
| | - Wei-Guo Jia
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai, 200433, People's Republic of China
| | - Guo-Xin Jin
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai, 200433, People's Republic of China
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Min KS, DiPasquale AG, Golen JA, Rheingold AL, Arif AM, Miller JS. Synthesis, structure, and magnetic properties of valence ambiguous dinuclear antiferromagnetically coupled cobalt and ferromagnetically coupled iron complexes containing the chloranilate(2-) and the significantly stronger coupling chloranilate(*3-) radical trianion. J Am Chem Soc 2007; 129:2360-8. [PMID: 17269771 DOI: 10.1021/ja067208q] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dinuclear [(TPyA)MII(CA2-)MII(TPyA)]2+ [TPyA=tris(2-pyridylmethyl)amine; CA2-=chloranilate dianion; M=Co (1(2+)), Fe (2(2+))] complexes have been prepared by the reaction of M(BF4)(2).6H2O, TPyA, H2CA, and triethylamine in MeOH solution. Their reduced forms [(TPyA)MII(CA*3-)MII(TPyA)]+ [M=Co(1+), Fe (2+)] have been synthesized by using cobaltocene, and oxidized forms of 1, [(TPyA)CoIII(CAn)CoIII(TPyA)]z+ [z=3, n=3- (1(3+)); z=4, n=2- (1(4+))], have been obtained by using FcBF4 and ThianBF4 (Fc=ferrocenium; Thian=thianthrinium), respectively. The dinuclear compound bridged chloranilates (CA2- or CA*3-) were isolated and characterized by X-ray crystallography, electrochemistry, magnetism, and EPR spectroscopy. Unlike the other redox products, valence ambiguous 13+ forms via a complex redox-induced valence electron rearrangement whereby the one-electron oxidation of the [CoIICA2-CoII]2+ core forms [CoIIICA*3-CoIII]3+, not the expected simple 1-e- transfer mixed-valent [CoIICA2-CoIII]3+ core. The M ions in 1 and 2 have a distorted octahedral geometry by coordination with four nitrogens of a TPyA, two oxygens of a chloranilate. Due to the interdimer offset face-to-face pi-pi and/or herringbone interactions, all complexes show extended 1-D and/or 2-D supramolecular structures. The existence of CA*3- in 1(3+) is confirmed from both solid-state magnetic and solution EPR data. Co-based 1n+ exhibit antiferromagnetic interactions [1(2+): g=2.24, J/kB=-0.65 K (-0.45 cm-1); 1+: g=2.36, J/kB=-75 K (52 cm-1)], while Fe-based 2n+ exhibit ferromagnetic interactions [2(2+): g=2.08, J/kB=1.0 K (0.70 cm-1); 2+: g=2.03, J/kB=28 K (19 cm-1)] [H=-2JS1.S2 for 12+ and 2(2+); H=-2J(S1.S2+S2.S3) for 1+ and 2+]. Thus, due to direct spin exchange CA*3- is a much strong spin coupling linkage than the superexchange spin-coupling pathway provided by CA2-.
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Affiliation(s)
- Kil Sik Min
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA
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Min KS, Rheingold AL, Dipasquale A, Miller JS. Characterization of the Chloranilate(•3−) π Radical as a Strong Spin-Coupling Bridging Ligand. Inorg Chem 2006; 45:6135-7. [PMID: 16878921 DOI: 10.1021/ic061076k] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dinuclear [(TPA)Co(II)(CA2-)Co(II)(TPA)](BF4)2.2MeOH (1) [TPA = tris(2-pyridylmethyl)amine] and [(TPA)CoII(CA*3-)CoII(TPA)](BF4).2Et2O (2) with a bridging chloranilate radical ligand formed by reduction of 1 are crystallographically and magnetically characterized. 1 has shown a weak antiferromagnetic coupling within the Co(II) dimer [J/kB = -0.65 K (-0.45 cm(-1))], while 2 has a 2 orders of magnitude stronger antiferromagnetic interaction between the Co(II) ion and a radical [J/kB = -75 K (52 cm(-1))].
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Affiliation(s)
- Kil Sik Min
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2124, Salt Lake City, UT 84112-0850, USA
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Cotton FA, Murillo CA, Villagrán D, Yu R. Uniquely Strong Electronic Communication between [Mo2] Units Linked by Dioxolene Dianions. J Am Chem Soc 2006; 128:3281-90. [PMID: 16522110 DOI: 10.1021/ja0582962] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Unprecedented strong electronic communication has been found in dimolybdenum pairs containing quadruply bonded Mo2(DAniF)3(+) (DAniF = N,N'-di-p-anisylformamidinate) units linked by dioxolene (C6X2O4(2-)) anions. The neutral compounds [Mo2(DAniF)3]2(C6X2O4) (1, X = H; 2, X = Cl; 3, X = NO2) and the singly oxidized products {[Mo2(DAniF)3]2(C6X2O4)Mo2}PF6 (4, X = H; 5, X = Cl) have been synthesized and characterized by X-ray crystallography and spectroscopic methods. Unusually short Mo-O distances (approximately 2.05 A for 1 and 2, and approximately 2.01 A for 4 and 5) are implicated in the remarkably strong interaction between [Mo2] units via the linkers. This leads to an extensive charge delocalization in the mixed-valence species, which is mediated by the dioxolene linker, as revealed by the large deltaE(1/2) values (763, 795, and 816 mV for 1, 2, and 3, respectively). Additional evidence for the strong electronic coupling is provided by UV-vis, NIR, and EPR spectroscopies and DFT calculations.
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Affiliation(s)
- F Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
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Min KS, Rheingold AL, Rhinegold AL, Miller JS. Tris(chloranilato)ferrate(III) Anionic Building Block Containing the (Dihydroxo)oxodiiron(III) Dimer Cation: Synthesis and Characterization of [(TPA)(OH)FeIIIOFeIII(OH)(TPA)][Fe(CA)3]0.5(BF4)0.5·1.5MeOH·H2O [TPA = tris(2-pyridylmethyl)amine; CA = chloranilate]. J Am Chem Soc 2005; 128:40-1. [PMID: 16390111 DOI: 10.1021/ja0566984] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
[(TPA)(OH)FeIIIOFeIII(OH)(TPA)][Fe(CA)3]0.5(BF4)0.5.1.5MeOH.H2O (1) which possesses both the [FeIII(CA)3]3- (CA= chloranilate) and hydroxooxoiron(III) ions has had its structure determined by single-crystal X-ray diffraction. The 2-300 K magnetic susceptibility of 1 provides the magnetic parameters, g = 2.07, J/kB = -165 K (115 cm-1), theta = -1 K, and the spin impurity, rho = 0.05, which indicates a strong antiferromagnetic interaction between iron(III) ions via the oxo anion.
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Affiliation(s)
- Kil Sik Min
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2124, Salt Lake City, UT 84112-0850, USA
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Kitagawa S. Coordination compounds of 1,4-dihydroxybenzoquinone and its homologues. Structures and properties. Coord Chem Rev 2002. [DOI: 10.1016/s0010-8545(01)00369-1] [Citation(s) in RCA: 251] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bis(alkynyl) transition metal complexes, R1CC[M]CCR2, as organometallic chelating ligands; formation of μ,η1(2)-alkynyl-bridged binuclear and oligonuclear complexes. Coord Chem Rev 2000. [DOI: 10.1016/s0010-8545(00)00270-8] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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An easy entry to novel early–late oligonuclear transition metal complexes containing π-conjugated systems. INORG CHEM COMMUN 1999. [DOI: 10.1016/s1387-7003(99)00158-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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