4,4′-Bis(tert-butyl)-2,2′-bipyridinedichlorometal(II) - Synthesis, structure and EPR spectroscopy
4,4′-Bis(tert-butyl)-2,2′-bipyridinedichlorometal(II) - Synthesis, structure and EPR spectroscopy
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DOI：
10.1016/j.ica.2010.08.035
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发表时间：
2011-01-15
影响因子：
2.8
通讯作者：
Strauch, Peter
中科院分区：
文献类型：
--
作者：
Awad, Duha Jawad;Schilde, Uwe;Strauch, Peter
Due to the better solubility of the 4,4'-substituted bipyridine ligand a series of 4,4'0-bis(tert-butyl)-2,2'-bipyridinedichlorometal(II) complexes, [M(tbbpy)Cl-2], with M = Cu, Ni, Zn, Pd, Pt was synthesised and characterised. The blue copper complex 4,4'-bis(tert-butyl)-2,2'-bipyridinedichlorocopper(II) was isolated in two different polymorphic forms, as prisms 1 with a solvent inclusion and solvent-free as needles 2. Both structures were determined by X-ray structure analysis. They crystallise in the monoclinic space group P2(1)/c with four molecules in the unit cell, but with different unit cells and packing motifs. Whereas in the prisms 1, with the unit cell parameters a = 12.1613(12), b = 10.6363(7), c = 16.3074(15) angstrom, eta = 94.446(8)degrees, the packing is dominated by intra-and intermolecular hydrogen bonds, in the needles 2, with a = 7.738(1), b = 18. 333(2), c = 13.291(3) angstrom, beta = 97.512(15)degrees, only intramolecular hydrogen bonds appear and the complex molecules are arranged in columns which are stabilised by p-p-stacking interactions. In both complexes the copper has a tetrahedrally distorted coordination sphere. These copper complexes were also studied by EPR spectroscopy in solution, as frozen glass and diamagnetically diluted powder with the analogue [Pd(tbbpy)Cl-2] as host lattice. (C) 2010 Elsevier B.V. All rights reserved.
