An e.p.r. study of tetradentate Schiff base copper complexes with an N–(CH2) n –N, n = 3–6 backbone
作者： Kumari Murthy Ananth , Mookandi Kanthimathi , Balachandran Unni Nair
关键词: Planarity testing 、 Organometallic chemistry 、 Copper 、 Methylene 、 Schiff base 、 Stereochemistry 、 Spectral line 、 Intermolecular force 、 Crystallography 、 Chemistry 、 Ground state
摘要: CuII complexes of Schiff-base ligands with a general formulation o-HOC6H4CH=N–(CH2) n –N=CHC6H4OH-o, where n = 3–6 have been prepared and their e.p.r. spectra investigated in order to determine the effect flexible methylene backbone length on structure. The room temperature 77 K compounds, 3 4, are typical axially symmetric ground state g ∥ > g ⊥. When 5, other hand, complex gives an isotropic spectrum at temperature. For 6, g ⊥ appears be greater than g ∥. g iso value increases gradually from 6 indicating deviation planarity. Simulation for shows presence two distinct Cu2+ sites equal probability. Q-band this compound exhibits narrowed signal indicative exchange coupling. is consequence intermolecular electron giving pseudo d2 z state.
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sci-hub.se 参考文章(19)
Zoltan Tyeklar, Kenneth D. Karlin, Copper-dioxygen chemistry: a bioinorganic challenge Accounts of Chemical Research. ,vol. 22, pp. 241- 248 ,(1989) , 10.1021/AR00163A003
Katia Bernardo, Simon Leppard, Anne Robert, Gérard Commenges, Françoise Dahan, Bernard Meunier, Synthesis and Characterization of New Chiral Schiff Base Complexes with Diiminobinaphthyl or Diiminocyclohexyl Moieties as Potential Enantioselective Epoxidation Catalysts. Inorganic Chemistry. ,vol. 35, pp. 387- 396 ,(1996) , 10.1021/IC950700I
A. H. Maki, B. R. McGarvey, Electron Spin Resonance in Transition Metal Chelates. I. Copper (II) Bis-Acetylacetonate Journal of Chemical Physics. ,vol. 29, pp. 31- 34 ,(1958) , 10.1063/1.1744456
Paul J. Ellis, Hans C. Freeman, Michael A. Hitchman, Dirk Reinen, Burghard Wagner, EXAFS Evidence That the CuCl64- Ion in (3-Chloroanilinium)8(CuCl6)Cl4 Has an Elongated Rather Than Compressed Tetragonal Geometry Inorganic Chemistry. ,vol. 33, pp. 1249- 1250 ,(1994) , 10.1021/IC00085A005
Kerro Knox, Structure of K2CuF4. New Kind of Distortion for Octahedral Copper(II) The Journal of Chemical Physics. ,vol. 30, pp. 991- 993 ,(1959) , 10.1063/1.1730141
Denise A. Tucker, Peter S. White, Kathleen L. Trojan, Martin L. Kirk, William E. Hatfield, Identification of a Novel Tetragonally-Compressed Six-Coordinate Copper (II) Complex: Preparation and Characterization of a 3-Chloroanilinium Copper Chloride Complex (3-Chloroanilinium)(8)(CuC1(6)C1(4)) Inorganic Chemistry. ,vol. 30, pp. 823- 826 ,(1991) , 10.1021/IC00004A040
Burkhard Wagner, Salam A. Warda, Michael A. Hitchman, Dirk Reinen, Geometry and Electronic Structure of CuCl64- Polyhedra Doped into (3-Chloroanilinium)8[CdCl6]Cl4An EPR and Structural Investigation Inorganic Chemistry. ,vol. 35, pp. 3967- 3974 ,(1996) , 10.1021/IC951418E
Mohan M. Bhadbhade, D. Srinivas, Effects on molecular association, chelate conformation, and reactivity toward substitution in copper Cu(5-X-salen) complexes, salen2- = N,N'-ethylenebis(salicylidenaminato), X = H, CH3O, and Cl: synthesis, x-ray structures, and EPR investigations Inorganic Chemistry. ,vol. 32, pp. 5458- 5466 ,(1993) , 10.1021/IC00076A010
H. R. Gersmann, J. D. Swalen, Electron Paramagnetic Resonance Spectra of Copper Complexes The Journal of Chemical Physics. ,vol. 36, pp. 3221- 3233 ,(1962) , 10.1063/1.1732450
Stephen Fox, Alaganandan Nanthakumar, Mårten Wikström, Kenneth D. Karlin, Ninian J. Blackburn, XAS Structural Comparisons of Reversibly Interconvertible Oxo- and Hydroxo-Bridged Heme-Copper Oxidase Model Compounds Journal of the American Chemical Society. ,vol. 118, pp. 24- 34 ,(1996) , 10.1021/JA951686B