101
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Nayak S, Novitchi G, Hołyńska M, Dehnen S. Two Heterometallic Ionic Compounds with Isolated [3d] and [4f] Complex Units: Field-Induced Single-Ion Magnet (SIM) Behavior Observed from a Mononuclear Dysprosium(III) Complex. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402114] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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102
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Molnár E, Camus N, Patinec V, Rolla GA, Botta M, Tircsó G, Kálmán FK, Fodor T, Tripier R, Platas-Iglesias C. Picolinate-containing macrocyclic Mn2+ complexes as potential MRI contrast agents. Inorg Chem 2014; 53:5136-49. [PMID: 24773460 DOI: 10.1021/ic500231z] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report the synthesis of the ligand Hnompa (6-((1,4,7-triazacyclononan-1-yl)methyl)picolinic acid) and a detailed characterization of the Mn(2+) complexes formed by this ligand and the related ligands Hdompa (6-((1,4,7,10-tetraazacyclododecan-1-yl)methyl)picolinic acid) and Htempa (6-((1,4,8,11-tetraazacyclotetradecan-1-yl)methyl)picolinic acid). These ligands form thermodynamically stable complexes in aqueous solution with stability constants of logKMnL = 10.28(1) (nompa), 14.48(1) (dompa), and 12.53(1) (tempa). A detailed study of the dissociation kinetics of these Mn(2+) complexes indicates that the decomplexation reaction at about neutral pH occurs mainly following a spontaneous dissociation mechanism. The X-ray structure of [Mn2(nompa)2(H2O)2](ClO4)2 shows that the Mn(2+) ion is seven-coordinate in the solid state, being directly bound to five donor atoms of the ligand, the oxygen atom of a coordinated water molecule and an oxygen atom of a neighboring nompa(-) ligand acting as a bridging bidentate carboxylate group (μ-η(1)-carboxylate). Nuclear magnetic relaxation dispersion ((1)H NMRD) profiles and (17)O NMR chemical shifts and transverse relaxation rates of aqueous solutions of [Mn(nompa)](+) indicate that the Mn(2+) ion is six-coordinate in solution by the pentadentate ligand and one inner-sphere water molecule. The analysis of the (1)H NMRD and (17)O NMR data provides a very high water exchange rate of the inner-sphere water molecule (kex(298) = 2.8 × 10(9) s(-1)) and an unusually high value of the (17)O hyperfine coupling constant of the coordinated water molecule (AO/ℏ = 73.3 ± 0.6 rad s(-1)). DFT calculations performed on the [Mn(nompa)(H2O)](+)·2H2O system (TPSSh model) provide a AO/ℏ value in excellent agreement with the one obtained experimentally.
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Affiliation(s)
- Enikő Molnár
- Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña , Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
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103
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Hermosilla-Ibáñez P, Cañon-Mancisidor W, Costamagna J, Vega A, Paredes-García V, Garland MT, Le Fur E, Cador O, Spodine E, Venegas-Yazigi D. Crystal lattice effect on the quenching of the intracluster magnetic interaction in [V12B18O60H6]10− polyoxometalate. Dalton Trans 2014; 43:14132-41. [DOI: 10.1039/c4dt01561d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Quenching effect of the intracluster antiferromagnetic coupling by alkaline ions of the crystalline packing.
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Affiliation(s)
| | | | - Juan Costamagna
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- USACH
- Chile
| | - Andrés Vega
- CEDENNA
- Chile
- Universidad Andres Bello
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
| | - Verónica Paredes-García
- CEDENNA
- Chile
- Universidad Andres Bello
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
| | | | - Eric Le Fur
- ENSCR
- CNRS
- UMR 6226
- Rennes, France
- Université Européenne de Bretagne
| | - Olivier Cador
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes1
- Rennes, France
| | - Evgenia Spodine
- CEDENNA
- Chile
- Facultad de Ciencias Químicas y Farmacéuticas
- Universidad de Chile
- Chile
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104
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Gallien AKE, Schaniel D, Woike T, Klüfers P. NO-binding in {Ru(NO)2}8-type [Ru(NO)2(PR3)2X]BF4 compounds. Dalton Trans 2014; 43:13278-92. [DOI: 10.1039/c4dt01506a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Electron-poor {Ru(NO)2}8-type dinitrosyls exhibit an RuII(NO+)(NO−) moiety, electron-rich entities show an Ru0(NO+)2 situation, borderline compounds show both forms as photo-excitable species.
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Affiliation(s)
| | - Dominik Schaniel
- Université de Lorraine
- Vandoeuvre les Nancy, France
- CNRS
- Vandoeuvre les Nancy, France
| | - Theo Woike
- TU Dresden
- Institut für Strukturphysik
- 01069 Dresden, Germany
| | - Peter Klüfers
- Fakultät für Chemie und Pharmazie
- 81377 Munich, Germany
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105
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Yi X, Bernot K, Calvez G, Daiguebonne C, Guillou O. 3D Organization of Dysprosium Cubanes. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300937] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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106
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Lee JW, Lim KS, Ryu DW, Koh EK, Yoon SW, Suh BJ, Hong CS. Cyanide-bridged W(V)Mn(III) bimetallic chains composed of a blocked W hexacyanide precursor: geometry-related magnetic couplings and magnetostructural correlation. Inorg Chem 2013; 52:8677-84. [PMID: 23855908 DOI: 10.1021/ic400845z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Five one-dimensional bimetallic W(V)Mn(III) complexes 1-5, consisting of [W(CN)6(bpy)](-) anions and [Mn(Schiff base)](+) cations, were prepared. The central coordination geometry around each W atom is determined as a distorted dodecahedron (DD) for 1 and 2, and a distorted square antiprism (SAPR) for 3-5. Magnetic analyses demonstrate that compounds 1, 4, and 5 exhibit antiferromagnetic interactions between magnetic centers, which are different from the ferromagnetic couplings in 2 and 3. For the distorted DD geometry, the Mn-N(ax) (ax = axial) bond length increases when moving from 1 to 2, with the Mn-N(ax)-C(ax) angle remaining constant. The elongation of the bond length is responsible for the reduction in orbital overlap and consequent ferromagnetic coupling in 2. In comparison, for 3-5 with the distorted SAPR geometry, given that the Mn-N(ax) bond lengths are similar across all the samples, the increase in the Mn-N(ax)-C(ax) angles accounts for the enhanced magnetic strength. Notably, a correlation between structure and magnetic exchange coupling is established for the first time in W(V)Mn(III) bimetallic systems based on the [W(CN)6(bpy)](-) precursor.
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Affiliation(s)
- Jin Wuk Lee
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 136-713, Korea
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107
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Falceto A, Casanova D, Alemany P, Alvarez S. Pseudo-symmetry Analysis of the d-block Molecular Orbitals in Four-Coordinate Complexes. Inorg Chem 2013; 52:6510-9. [DOI: 10.1021/ic4004774] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrés Falceto
- Departament
de Química Inorgànica, ‡Departament de Química Física and §Institut de Química
Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès
1-11, 08028 Barcelona, Spain
| | - David Casanova
- Departament
de Química Inorgànica, ‡Departament de Química Física and §Institut de Química
Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès
1-11, 08028 Barcelona, Spain
| | - Pere Alemany
- Departament
de Química Inorgànica, ‡Departament de Química Física and §Institut de Química
Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès
1-11, 08028 Barcelona, Spain
| | - Santiago Alvarez
- Departament
de Química Inorgànica, ‡Departament de Química Física and §Institut de Química
Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès
1-11, 08028 Barcelona, Spain
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108
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Casanova D, Alemany P, Falceto A, Carreras A, Alvarez S. Pseudosymmetry analysis of molecular orbitals. J Comput Chem 2013; 34:1321-31. [DOI: 10.1002/jcc.23257] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 01/21/2013] [Accepted: 02/01/2013] [Indexed: 11/11/2022]
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109
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Chandrasekhar V, Dey A, Das S, Rouzières M, Clérac R. Syntheses, Structures, and Magnetic Properties of a Family of Heterometallic Heptanuclear [Cu5Ln2] (Ln = Y(III), Lu(III), Dy(III), Ho(III), Er(III), and Yb(III)) Complexes: Observation of SMM behavior for the Dy(III) and Ho(III) Analogues. Inorg Chem 2013; 52:2588-98. [DOI: 10.1021/ic302614k] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vadapalli Chandrasekhar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016,
India
- Tata Institute of Fundamental Research, Centre for Interdisciplinary
Sciences, 21 Brundavan Colony, Narsingi, Hyderabad-500075, India
| | - Atanu Dey
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016,
India
| | - Sourav Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016,
India
| | - Mathieu Rouzières
- CNRS, CRPP, UPR 8641, F-33600
Pessac, France
- Univ. Bordeaux, CRPP, UPR 8641, F-33600 Pessac, France
| | - Rodolphe Clérac
- CNRS, CRPP, UPR 8641, F-33600
Pessac, France
- Univ. Bordeaux, CRPP, UPR 8641, F-33600 Pessac, France
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110
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Buchholz A, Eseola AO, Plass W. Slow magnetic relaxation in mononuclear tetrahedral cobalt(II) complexes with 2-(1H-imidazol-2-yl)phenol based ligands. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.07.005] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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111
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Hołyńska M. Binuclear, oximate-bridged Co-main group element complexes–structures and properties. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.03.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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112
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Lee J, Lim K, Yoon J, Ryu D, Koo B, Koh E, Hong C. Cyanide-bridged WVMnIII single-chain magnet based on an octacoordinate [W(CN)6(phen)]− anion. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4539-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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113
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Yoon JH, Lee JW, Ryu DW, Choi SY, Yoon SW, Suh BJ, Koh EK, Kim HC, Hong CS. Cyanide-Bridged WVMnIII Single-Chain Magnet with Isolated MnIII Moieties Exhibiting Two Types of Relaxation Dynamics. Inorg Chem 2011; 50:11306-8. [DOI: 10.1021/ic202100y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jung Hee Yoon
- Department of Chemistry
(BK21), Korea University,
Seoul 136-713, Korea
| | - Jin Wuk Lee
- Department of Chemistry
(BK21), Korea University,
Seoul 136-713, Korea
| | - Dae Won Ryu
- Department of Chemistry
(BK21), Korea University,
Seoul 136-713, Korea
| | - Sang Yup Choi
- Department of Chemistry
(BK21), Korea University,
Seoul 136-713, Korea
| | - Sung Won Yoon
- Department of Physics, The Catholic University of Korea, Buchon
420-743, Korea
| | - Byoung Jin Suh
- Department of Physics, The Catholic University of Korea, Buchon
420-743, Korea
| | - Eui Kwan Koh
- Nano-Bio System
Research Team, Korea Basic Science Institute, Seoul 136-713, Korea
| | | | - Chang Seop Hong
- Department of Chemistry
(BK21), Korea University,
Seoul 136-713, Korea
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114
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Wurzenberger X, Piotrowski H, Klüfers P. Ein stabiler molekularer Ausschnitt aus seltenen Eisen(II)-Mineralen: der quadratisch-planare High-Spin-d6-FeIIO4-Chromophor. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006898] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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115
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Wurzenberger X, Piotrowski H, Klüfers P. A Stable Molecular Entity Derived from Rare Iron(II) Minerals: The Square-Planar High-Spin-d6 FeIIO4 Chromophore. Angew Chem Int Ed Engl 2011; 50:4974-8. [DOI: 10.1002/anie.201006898] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2010] [Revised: 02/16/2011] [Indexed: 11/10/2022]
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116
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Spielberg ET, Plass W. Copper(II) and Zinc(II) Complexes with a Photoactive Bridging Ligand Based on Carbazole: Synthesis, Structures, Electronic and Magnetic Properties. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201000970] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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117
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Korzeniak T, Pinkowicz D, Nitek W, Bałanda M, Fitta M, Sieklucka B. The role of carboxylate ligands in two novel cyanido-bridged 2D coordination networks CuII–WV and MnII–NbIV. Dalton Trans 2011; 40:12350-7. [DOI: 10.1039/c1dt10800j] [Citation(s) in RCA: 11] [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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118
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119
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Alvarez S, Echeverría J. New perspectives on polyhedral molecules and their crystal structures. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1735] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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120
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Cremades E, Echeverría J, Alvarez S. The Trigonal Prism in Coordination Chemistry. Chemistry 2010; 16:10380-96. [DOI: 10.1002/chem.200903032] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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121
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Pinkowicz D, Pełka R, Drath O, Nitek W, Bałanda M, Majcher AM, Poneti G, Sieklucka B. Nature of Magnetic Interactions in 3D {[MII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (M = Mn, Fe, Co, Ni) Molecular Magnets. Inorg Chem 2010; 49:7565-76. [DOI: 10.1021/ic100937h] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dawid Pinkowicz
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Robert Pełka
- H. Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Kraków, Poland
| | - Olga Drath
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Wojciech Nitek
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Maria Bałanda
- H. Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Kraków, Poland
| | | | - Giordano Poneti
- Laboratory of Molecular Magnetism (LAMM), Department of Chemistry, Ugo Schiff and INSTM Research Unit, University of Florence, Via della Lastruccia 3−13, 50019 Sesto Fiorentino, Florence, Italy
| | - Barbara Sieklucka
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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122
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Ruiz-Martínez A, Casanova D, Alvarez S. Ligand Association/Dissociation Paths and Ill-Defined Coordination Numbers. Chemistry 2010; 16:6567-81. [DOI: 10.1002/chem.200902996] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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123
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Venkatakrishnan TS, Sahoo S, Bréfuel N, Duhayon C, Paulsen C, Barra AL, Ramasesha S, Sutter JP. Enhanced Ion Anisotropy by Nonconventional Coordination Geometry: Single-Chain Magnet Behavior for a [{FeIIL}2{NbIV(CN)8}] Helical Chain Compound Designed with Heptacoordinate FeII. J Am Chem Soc 2010; 132:6047-56. [DOI: 10.1021/ja9089389] [Citation(s) in RCA: 160] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thengarai S. Venkatakrishnan
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Shaon Sahoo
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Nicolas Bréfuel
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Carine Duhayon
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Carley Paulsen
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Anne-Laure Barra
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - S. Ramasesha
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
| | - Jean-Pascal Sutter
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France, Université de Toulouse, UPS, INPT, LCC, F-31077 Toulouse, France, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India, Institut Néel, CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, 25 rue des Martyrs, F-38042 Grenoble, France, and Department of Physics, Indian Institute of Science,
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124
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Ruiz-Martínez A, Alvarez S. Stereochemistry of Compounds with Coordination Number Ten. Chemistry 2009; 15:7470-80. [DOI: 10.1002/chem.200900547] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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125
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Cirera J, Ruiz E, Alvarez S, Neese F, Kortus J. How to build molecules with large magnetic anisotropy. Chemistry 2009; 15:4078-87. [PMID: 19248077 DOI: 10.1002/chem.200801608] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Predicting single-molecule magnets? Magnetic anisotropy, a property that plays a key role in single-molecule magnets (SMMs), has been analyzed by using theoretical methods. Mononuclear complexes and the dependence of the magnetic anisotropy on their geometrical and electronic structure, as well as how such mononuclear complexes must be combined as building blocks to obtain polynuclear complexes with large anisotropy (see figure) are considered.The magnetic anisotropy of mononuclear transition-metal complexes has been studied by means of electronic structure calculations based on density functional theory. The variation of the zero-field splitting (ZFS) parameters has been analyzed for the following characteristic distortions: a tetragonal Jahn-Teller distortion, the Bailar twist, the Berry pseudorotation, and the planarization of tetrahedral complexes. Finally, the coupling of mononuclear building blocks in polynuclear complexes to obtain a large negative magnetic anisotropy necessary to improve their single-molecule-magnet (SMM) behavior has been studied.
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Affiliation(s)
- Jordi Cirera
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, Barcelona, Spain
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126
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Tassel C, Pruneda JM, Hayashi N, Watanabe T, Kitada A, Tsujimoto Y, Kageyama H, Yoshimura K, Takano M, Nishi M, Ohoyama K, Mizumaki M, Kawamura N, Iñiguez J, Canadell E. CaFeO2: a new type of layered structure with iron in a distorted square planar coordination. J Am Chem Soc 2009; 131:221-9. [PMID: 19128179 DOI: 10.1021/ja8072269] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
CaFeO(2), a material exhibiting an unprecedented layered structure containing 3d(6) iron in a high-spin distorted square-planar coordination, is reported. The new phase, obtained through a low-temperature reduction procedure using calcium hydride, has been characterized through powder neutron diffraction, synchrotron X-ray diffraction, Mossbauer spectroscopy, XAS experiments as well as first-principles DFT calculations. The XAS spectra near the Fe-K edge for the whole solid solution (Sr(1-x)Ca(x))FeO(2) supports that iron is in a square-planar coordination for 0 </= x </= 0.8 but clearly suggests a change of coordination for x = 1. The new structure contains infinite FeO(2) layers in which the FeO(4) units unprecedentedly distort from square-planar toward tetrahedra and rotate along the c-axis, in marked contrast to the well-studied and accepted concept that octahedral rotation in perovskite oxides occurs but the octahedral shape is kept almost regular. The new phase exhibits high-spin configuration and G-type antiferromagnetic ordering as in SrFeO(2). However, the distortion of the FeO(2) layers leads to only a slight decrease of the Neel temperature with respect to SrFeO(2). First-principles DFT calculations provide a clear rationalization of the structural and physical observations for CaFeO(2) and highlight how the nature of the cation influences the structural details of the AFeO(2) family of compounds (A = Ca, Sr, Ba). On the basis of these calculations the driving force for the distortion of the FeO(2) layers in CaFeO(2) is discussed.
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Affiliation(s)
- Cédric Tassel
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Korzeniak T, Desplanches C, Podgajny R, Giménez-Saiz C, Stadnicka K, Rams M, Sieklucka B. Magnetostructural Correlations in CuII−NC−WV Linkage: The Case of [CuII(diimine)]2+−[WV(CN)8]3− 0D Assemblies. Inorg Chem 2009; 48:2865-72. [DOI: 10.1021/ic801989b] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomasz Korzeniak
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Cédric Desplanches
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Robert Podgajny
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Carlos Giménez-Saiz
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Katarzyna Stadnicka
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Michał Rams
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - Barbara Sieklucka
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, Université Bordeaux 1, CNRS, Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048, 87 avenue du Dr. A. Schweitzer, 33608 Pessac Cedex, France, Institute for Material Science, University of Valencia, Polígon La Coma, 46980 Paterna, Spain, and M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
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128
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Pinsky M, Dryzun C, Casanova D, Alemany P, Avnir D. Analytical methods for calculating Continuous Symmetry Measures and the Chirality Measure. J Comput Chem 2008; 29:2712-21. [PMID: 18484634 DOI: 10.1002/jcc.20990] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We provide analytical solutions of the Continuous Symmetry Measure (CSM) equation for several symmetry point-groups, and for the associated Continuous Chirality Measure (CCM), which are quantitative estimates of the degree of a symmetry-point group or chirality in a structure, respectively. We do it by solving analytically the problem of finding the minimal distance between the original structure and the result obtained by operating on it all of the operations of a specific G symmetry point group. Specifically, we provide solutions for the symmetry measures of all of the improper rotations point group symmetries, S(n), including the mirror (S(1), C(S)), inversion (S(2), C(i)) as well as the higher S(n)s (n > 2 is even) point group symmetries, for the rotational C(2) point group symmetry, for the higher rotational C(n) symmetries (n > 2), and finally for the C(nh) symmetry point group. The chirality measure is the minimal of all S(n) measures.
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Affiliation(s)
- Mark Pinsky
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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129
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Echeverría J, Alvarez S. Application of Symmetry Operation Measures in Structural Inorganic Chemistry. Inorg Chem 2008; 47:10965-70. [DOI: 10.1021/ic801264n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jorge Echeverría
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
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130
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Pinkowicz D, Podgajny R, Nitek W, Makarewicz M, Czapla M, Mihalik M, Bałanda M, Sieklucka B. Influence of octacyanoniobate(IV)-bridging geometry on Tc in Mn2Nb ferrimagnets of identical 3D topology. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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131
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Lim JH, Yoo HS, Kim JI, Yoon JH, Yang N, Koh EK, Park J, Hong CS. A Facially Capped Body‐Centered Ni9W6Cubane Modified with Sulfur‐Containing Bidentate Ligands: Structure and Magnetic Properties. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800416] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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132
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Tassel C, Watanabe T, Tsujimoto Y, Hayashi N, Kitada A, Sumida Y, Yamamoto T, Kageyama H, Takano M, Yoshimura K. Stability of the Infinite Layer Structure with Iron Square Planar Coordination. J Am Chem Soc 2008; 130:3764-5. [DOI: 10.1021/ja800415d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Cédric Tassel
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Takashi Watanabe
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Yoshihiro Tsujimoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Naoaki Hayashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Atsushi Kitada
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Yuji Sumida
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Takafumi Yamamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Hiroshi Kageyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Mikio Takano
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Kazuyoshi Yoshimura
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan, and Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
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133
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Cirera J, Ruiz E, Alvarez S. Stereochemistry and Spin State in Four-Coordinate Transition Metal Compounds. Inorg Chem 2008; 47:2871-89. [DOI: 10.1021/ic702276k] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jordi Cirera
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
| | - Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
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134
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Venkatakrishnan TS, Rajamani R, Ramasesha S, Sutter JP. Synthesis, Crystal Structure, and Magnetic Properties of Hexanuclear [{MnL2}4{Nb(CN)8}2] and Nonanuclear [{MnL2}6{Nb(CN)8}3] Heterometallic Clusters (L = bpy, phen). Inorg Chem 2007; 46:9569-74. [PMID: 17910432 DOI: 10.1021/ic062383t] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A hexanuclear cyano-bridged {MnII4NbIV2} cluster (1) bearing 2,2'-bipyridine (bpy) as the blocking ligand at manganese is obtained from the reaction of cis-[MnCl2(bpy)2] and K4[Nb(CN)8]. When the blocking ligand is 1,10-phenanthroline (phen), a nonanuclear cluster {MnII6NbIV3} (2) is obtained. The structure of [{Mn(bpy)2}4{Nb(CN)8}2] has been solved by single-crystal X-ray crystallography, whereas the phen derivative has been confirmed by means of the structure analysis of the corresponding WIV analogue [{Mn(phen)2}6{W(CN)8}3(H2O)2]. Magnetic measurements revealed S=9 and 27/2 spin ground states for these aggregates as a result of antiferromagnetic Nb-Mn interaction with JNb-Mn=-18.1 cm(-1) (1) and -13.6 cm(-1) (2).
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Affiliation(s)
- Thengarai S Venkatakrishnan
- Laboratoire de Chimie de Coordination du CNRS, Université Paul Sabatier, 205 route de Narbonne, 31077 Toulouse, France
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135
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Vela J, Cirera J, Smith JM, Lachicotte RJ, Flaschenriem CJ, Alvarez S, Holland PL. Quantitative geometric descriptions of the belt iron atoms of the iron-molybdenum cofactor of nitrogenase and synthetic iron(II) model complexes. Inorg Chem 2007; 46:60-71. [PMID: 17198413 PMCID: PMC2676240 DOI: 10.1021/ic0609148] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Six of the seven iron atoms in the iron-molybdenum cofactor of nitrogenase display an unusual geometry, which is distorted from the tetrahedral geometry that is most common in iron-sulfur clusters. This distortion pulls the iron along one C3 axis of the tetrahedron toward a trigonal pyramid. The trigonal pyramidal coordination geometry is rare in four-coordinate transition metal complexes. In order to document this geometry in a systematic fashion in iron(II) chemistry, we have synthesized a range of four-coordinate iron(II) complexes that vary from tetrahedral to trigonal pyramidal. Continuous shape measures are used for a quantitative comparison of the stereochemistry of the Fe atoms in the iron-molybdenum cofactor with those of the presently and previously reported model complexes, as well as with those in polynuclear iron-sulfur compounds. This understanding of the iron coordination geometry is expected to assist in the design of synthetic analogues for intermediates in the nitrogenase catalytic cycle.
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Affiliation(s)
- Javier Vela
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
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136
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Pinsky M, Casanova D, Alemany P, Alvarez S, Avnir D, Dryzun C, Kizner Z, Sterkin A. Symmetry operation measures. J Comput Chem 2007; 29:190-7. [PMID: 17559057 DOI: 10.1002/jcc.20772] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We introduce a new mathematical tool for quantifying the symmetry contents of molecular structures: the Symmetry Operation Measures. In this approach, we measure the minimal distance between a given structure and the structure which is obtained after applying a selected symmetry operation on it. If the given operation is a true symmetry operation for the structure, this distance is zero; otherwise it gives an indication of how different the transformed structure is from the original one. Specifically, we provide analytical solutions for measures of all the improper rotations, S n p, including mirror symmetry and inversion, as well as for all pure rotations, C n p. These measures provide information complementary to the Continuous Symmetry Measures (CSM) that evaluate the distance between a given structure and the nearest structure which belongs to a selected symmetry point-group.
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Affiliation(s)
- Mark Pinsky
- Institute of Chemistry, The Lise Meitner Minerva Center for Computational Quantum Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel
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137
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García-Monforte MA, Alonso PJ, Forniés J, Menjón B. New advances in homoleptic organotransition-metal compounds: The case of perhalophenyl ligands. Dalton Trans 2007:3347-59. [PMID: 17664969 DOI: 10.1039/b708938d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Homoleptic derivatives of formula [M(C(6)X(5))(n)](z-) (X = F, Cl) have been prepared and isolated for every first-row transition metal as well as for several of the heavier ones. The stoichiometry attained in each case (n ranging between 2 and 6) can be understood considering the tendency of a given metal ion to compensate its coordinative and electronic unsaturation, while not incurring severe interligand repulsive effects. The molecular structures associated with each stoichiometry seem, in turn, to be governed by electronic rather than steric factors. Most of these [M(C(6)X(5))(n)](z-) compounds are unsaturated, open-shell organometallic species, not fulfilling the 18-electron (or Effective Atomic Number) rule. This behaviour can be attributed to the absence of pi stabilising ligands (such as CO, phosphines, alkenes, alkynes, a variety of substituted aromatic rings, and so on) which are otherwise ubiquitous in organotransition-metal chemistry. The magnetic properties of the [M(C(6)X(5))(n)](z-) species have been determined by EPR spectroscopy and/or bulk magnetisation measurements. Excellent correlation between molecular geometry and magnetic properties (whether diamagnetic or paramagnetic) has been observed. Many of these compounds undergo chemically- or electrochemically-induced electron exchange processes. These redox reactions proceed without alteration in the stoichiometry of the [M(C(6)X(5))(n)](z-) compound, but usually involve a sharp change in the molecular geometry according to the different electron configuration of the interrelated species.
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Affiliation(s)
- M Angeles García-Monforte
- Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, Universidad de Zaragoza-C.S.I.C., C/Pedro Cerbuna 12, E-50009, Zaragoza, Spain
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138
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Visinescu D, Desplanches C, Imaz I, Bahers V, Pradhan R, Villamena FA, Guionneau P, Sutter JP. Evidence for Increased Exchange Interactions with 5d Compared to 4d Metal Ions. Experimental and Theoretical Insights into the Ferromagnetic Interactions of a Series of Trinuclear [{M(CN)8}3-/NiII] Compounds (M = MoV or WV). J Am Chem Soc 2006; 128:10202-12. [PMID: 16881650 DOI: 10.1021/ja061911x] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two main questions are addressed in this study: (i) What increase of exchange interaction can be expected when replacing a paramagnetic metal ion with a heavier congener located farther down the periodic table (i.e., 3d-4d-5d), and (ii) for a molecular unit with higher coordination numbers, eight in the present case, how is the magnetic information transferred from the metal ion to its ligand set? Qualitative and quantitative investigations on a series of trimetallic cyano-bridged {MoV(CN)8-NiII} and {WV(CN)8-NiII} compounds revealed ferromagnetic interactions but with a strength modulated by the spin organization and their nature. DFT calculations have been used to examine the mechanism and strengths of the exchange coupling, as well as the influence of the local symmetry of the cyanometalate unit on the spin density distribution. Both the experimental and the calculated behaviors underline a noticeable difference between the Mo and the W derivatives (JMoNi = 26.9 cm(-1) and JWNi = 37.3 cm(-1)) that is correlated to the spin density transferred from the metal center to its ligand set. It is also shown that the shape of the {M(CN)8} polyhedron may lead to nonequivalent CN sites and, consequently, to different strengths of the exchange interaction as a result of the position of the bridging ligands.
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Affiliation(s)
- Diana Visinescu
- Institut de Chimie de la Matière Condensée de Bordeaux-CNRS, Université Bordeaux 1, 87, Avenue Dr. Schweitzer, F-33608 Pessac, France
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