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Mikhaylov MA, Sokolov MN. Molybdenum Iodides - from Obscurity to Bright Luminescence. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900630] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Maxim A. Mikhaylov
- Nikolaev Institute of Inorganic Chemistry SB RAS; Prospect Lavrentyeva 3 630090 Novosibirsk Russia
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS; Prospect Lavrentyeva 3 630090 Novosibirsk Russia
- Novosibirsk State University; ul. Pirogova 2 630090 Novosibirsk Russia
- Kazan Federal University; ul. Kremlyovskaya 18 420008 Kazan Russia
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Halogen bridged mixed-metal complexes based on a trimethylplatinum fragment. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Adonin SA, Udalova LI, Abramov PA, Sokolov MN, Fedin VP. Mononuclear Molybdenum Oxohalide Complexes (Bu4N)[MoOCl4(H2O)] and (Bu4N)[MoOBr4(H2O)]: Synthesis and Crystal Structures. RUSS J COORD CHEM+ 2018. [DOI: 10.1134/s1070328418110015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Obies M, Perkins NR, Arcisauskaite V, Heath GA, Edwards AJ, McGrady JE. Redox-Dependent Metal−Metal Bonding in Trinuclear Metal Chains: Probing the Transition from Covalent Bonding to Exchange Coupling. Chemistry 2017; 24:5309-5318. [DOI: 10.1002/chem.201704727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Mohammed Obies
- Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QZ UK
- College of Pharmacy; University of Babylon; Hilla Iraq
| | - Nicholas R. Perkins
- Research School of Chemistry; The Australian National University; Canberra ACT0200 Australia
| | - Vaida Arcisauskaite
- Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QZ UK
| | - Graham A. Heath
- Physical, Engineering and Mathematical Sciences; ADFA; Northcott Road Canberra ACT2600 Australia
| | - Alison J. Edwards
- Australian Centre for Neutron Scattering; Australian Nuclear Science and Technology OrganisationNew Illawarra Road; Lucas Heights NSW 2232 Australia
| | - John E. McGrady
- Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QZ UK
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Hewage JW, Cavigliasso G, Stranger R. Metal-Metal Bonding in Trinuclear, Mixed-Valence [Ti3X12](4-) (X = F, Cl, Br, I) Face-Shared Complexes. Inorg Chem 2015; 54:10632-41. [PMID: 26523831 DOI: 10.1021/acs.inorgchem.5b01435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-metal bonding in structurally characterized In4Ti3Br12, comprising linear, mixed-valence d(1)d(2)d(1) face-shared [Ti3Br12](4-) units with a Ti-Ti separation of 3.087 Å and strong antiferromagnetic coupling (Θ = -1216 K), has been investigated using density functional theory. The antiferromagnetic configuration, in which the single d electron on each terminal Ti(III) (d(1)) metal center is aligned antiparallel to the two electrons occupying the central Ti(II) (d(2)) metal site, is shown to best agree with the reported structural and magnetic data and is consistent with an S = 0 ground state in which two of the four metal-based electrons are involved in a two-electron, three-center σ bond between the Ti atoms (formal Ti-Ti bond order of ∼0.5). However, the unpaired spin densities on the Ti sites indicate that while the metal-metal σ interaction is strong, the electrons are not fully paired off and consequently dominate the ground state antiferromagnetic coupling. The same overall partially delocalized bonding regime is predicted for the other three halide [Ti3X12](4-) (X = F, Cl, I) systems with the metal-metal bonding becoming weaker as the halide group is descended. The possibility of bond-stretch isomerism was also examined where one isomer has a symmetric structure with identical Ti-Ti bonds while the other is unsymmetric with one short and one long Ti-Ti bond. Although calculations indicate that the latter form is more stable, the barrier to interconversion between equivalent unsymmetric forms, where the short Ti-Ti bond is on one side of the trinuclear unit or the other, is relatively small such that at room temperature only the averaged (symmetric) structure is likely to be observed.
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Affiliation(s)
| | - Germán Cavigliasso
- Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 0200, Australia
| | - Robert Stranger
- Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 0200, Australia
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Schroeder M, Hartwig S, Krämer KW, Decurtins S, Hillebrecht H. Synthesis, Structure, and Properties of the New Mixed-Valent Dodecahalogenotrimetallate In4Ti3Br12 and its Relation to Compounds A3Ti2X9 (A = K, In; X = Cl, Br). Inorg Chem 2012; 51:8385-93. [DOI: 10.1021/ic3009442] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Melanie Schroeder
- Institut für
Anorganische
und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
| | - Sabina Hartwig
- Institut für
Anorganische
und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
| | - Karl W. Krämer
- Departement für Chemie
und Biochemie, Universität Bern,
Freiestr. 3, CH-3012 Bern, Switzerland
| | - Silvio Decurtins
- Departement für Chemie
und Biochemie, Universität Bern,
Freiestr. 3, CH-3012 Bern, Switzerland
| | - Harald Hillebrecht
- Institut für
Anorganische
und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
- Freiburger Materialforschungszentrum FMF, Stefan-Maier-Str. 25, D-79104 Freiburg, Germany
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Paraskevopoulou P, Makedonas C, Psaroudakis N, Mitsopoulou CA, Floros G, Seressioti A, Ioannou M, Sanakis Y, Rath N, Gómez García CJ, Stavropoulos P, Mertis K. Isolation, characterization, and computational studies of the novel [Mo3(mu3-Br)2(mu-Br)3Br6]2- cluster anion. Inorg Chem 2010; 49:2068-76. [PMID: 20131811 DOI: 10.1021/ic901432j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The novel trimolybdenum cluster [Mo(3)(mu(3)-Br)(2)(mu-Br)(3)Br(6)](2-) (1, {Mo(3)}(9+), 9 d-electrons) has been isolated from the reaction of [Mo(CO)(6)] with 1,2-C(2)H(4)Br(2) in refluxing PhCl. The compound has been characterized in solution by electrospray ionization mass spectrometry (ESI-MS), UV-vis spectroscopy, cyclic voltammetry, and in the solid state by X-ray analysis (counter-cations: (n-Bu)(4)N(+) (1), Et(4)N(+), Et(3)BzN(+)), electron paramagnetic resonance (EPR), magnetic susceptibility measurements, and infrared spectroscopy. The least disordered (n-Bu)(4)N(+) salt crystallizes in the monoclinic space group C2/c, a = 20.077(2) A, b = 11.8638(11) A, c = 22.521(2) A, alpha = 90 deg, beta = 109.348(4) deg, gamma = 90 deg, V = 5061.3(9) A(3), Z = 4 and contains an isosceles triangular metal arrangement, which is capped by two bromine ligands. Each edge of the triangle is bridged by bromine ions. The structure is completed by six terminal bromine ligands. According to the magnetic measurements and the EPR spectrum the trimetallic core possesses one unpaired electron. Electrochemical data show that oxidation by one electron of 1 is reversible, thus proceeding with retention of the trimetallic core, while the reduction is irreversible. The effective magnetic moment of 1 (mu(eff), 1.55 mu(B), r.t.) is lower than the spin-only value (1.73 mu(B)) for S = 1/2 systems, most likely because of high spin-orbit coupling of Mo(III) and/or magnetic coupling throughout the lattice. The ground electronic state of 1 was studied using density functional theory techniques under the broken symmetry formalism. The ground state is predicted to exhibit strong antiferromagnetic coupling between the three molybdenum atoms of the core. Moreover, our calculated data predict two broken symmetry states that differ only by 0.4 kcal/mol (121 cm(-1)). The antiferromagnetic character is delocalized over three magnetic orbitals populated by three electrons. The assignment of the infrared spectra is also provided.
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Cavigliasso G, Stranger R. Electronic Structure and Metal−Metal Interactions in Trinuclear Face-Shared [M3X12]3− (M = Mo, W; X = F, Cl, Br, I) Systems. Inorg Chem 2008; 47:3072-83. [DOI: 10.1021/ic702070z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Germán Cavigliasso
- Department of Chemistry, Faculty of Science, Australian National University, Canberra ACT 0200, Australia
| | - Robert Stranger
- Department of Chemistry, Faculty of Science, Australian National University, Canberra ACT 0200, Australia
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Maria S, Stoffelbach F, Mata J, Daran JC, Richard P, Poli R. The Radical Trap in Atom Transfer Radical Polymerization Need Not Be Thermodynamically Stable. A Study of the MoX3(PMe3)3 Catalysts. J Am Chem Soc 2005; 127:5946-56. [PMID: 15839694 DOI: 10.1021/ja043078e] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The molybdenum(III) coordination complexes MoX(3)(PMe(3))(3) (X = Cl, Br, and I) are capable of controlling styrene polymerization under typical atom transfer radical polymerization (ATRP) conditions, in conjunction with 2-bromoethylbenzene (BEB) as an initiator. The process is accelerated by the presence of Al(OPr(i))(3) as a cocatalyst. Electrochemical and synthetic studies aimed at identifying the nature of the spin trap have been carried out. The cyclic voltammogram of MoX(3)(PMe(3))(3) (X = Cl, Br, I) shows partial reversibility (increasing in the order Cl < Br < I) for the one-electron oxidation wave. Addition of X(-) changes the voltammogram, indicating the formation of MoX(4)(PMe(3))(3) for X = Cl and Br. On the other hand, I(-) is more easily oxidized than the MoI(3)(PMe(3))(3) complex; thus, the putative MoI(4)(PMe(3))(3) complex is redox unstable. Electrochemical studies of MoI(3)(PMe(3))(3) in the presence of X(-) (X = Cl or Br) reveal the occurrence of facile halide-exchange processes, leading to the conclusion that the MoI(3)X(PMe(3))(3) products are also redox unstable. The oxidation of MoX(3)(PMe(3))(3) with (1)/(2)Br(2) yields MoX(3)Br(PMe(3))(3) (X = Cl, Br), whose molecular nature is confirmed by single-crystal X-ray analyses. On the other hand, the oxidation of MoI(3)(PMe(3))(3) by I(2) slowly yields a tetraiodomolybdate(III) salt of iodotrimethylphosphonium, [Me(3)PI][MoI(4)(PMe(3))(3)], as confirmed by an X-ray study. This product has no controlling ability in radical polymerization. The redox instability of MoI(3)X(PMe(3))(3) can be reconciled with its involvement as a radical trapping species in the MoI(3)(PMe(3))(3)-catalyzed ATRP, given the second-order nature of its decomposition rate.
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Affiliation(s)
- Sébastien Maria
- Laboratoire de Chimie de Coordination, UPR CNRS 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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Gönen ZS, Gopalakrishnan J, Eichhorn BW, Greene RL. Structurally modulated magnetic properties in the A(3)MnRu(2)O(9) phases (A = Ba, Ca): the role of metal-metal bonding in perovskite-related oxides. Inorg Chem 2001; 40:4996-5000. [PMID: 11531449 DOI: 10.1021/ic0013431] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ca(3)MnRu(2)O(9) and Ba(3)MnRu(2)O(9) were synthesized from transition metal dioxides and alkaline earth metal carbonates at 1100-1300 degrees C. Ca(3)MnRu(2)O(9) adopts the prototypical GdFeO(3)-type perovskite structure with Mn and Ru statistically disordered over the single metal atom site. The susceptibility shows Curie-Weiss behavior above 240 K with mu(eff) = 3.14 micro(B)/metal atom, which is in excellent agreement with the expected spin-only moment of 3.20 micro(B). Below 150 K, the compound shows spin-glass-like short-range ferrimagnetic correlations. The high-temperature region of the electrical resistivity reveals a small activation energy of 17(1) meV whereas the low-temperature region is nonlinear and does not fit a variable range hopping model. Ba(3)MnRu(2)O(9) crystallizes in the 9-layer BaRuO(3)-type structure containing M(3)O(12) face-shared trioctahedral clusters in which Mn and Ru are statistically disordered. Ba(3)MnRu(2)O(9) shows nonlinear reciprocal susceptibility at all temperatures and is described by a variable-spin cluster model with an S = (1)/(2) ground state with thermally populated excited states. The low spin value of this system (S = (1)/(2)) is attributed to direct metal-metal bonding. Below 30 K, the compound shows short-range magnetic correlations and spin-glass-like behavior. The high-temperature region of the electrical resistivity indicates a small activation energy of 8.8(1) meV whereas the low-temperature region is nonlinear. The importance of metal-metal bonding and the relationships to other related compounds are discussed.
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Affiliation(s)
- Z S Gönen
- Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
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