Preparation, crystal structure, spectroscopic and magnetic characterisation of acetatobis(di-2-pyridylamine)copper(II) tetrafluoroborate and μ-carbonato-tetrakis(di-2-pyridylamine) dicopper(II) bistetrafluoroborate tetrahydrate
作者:Sujittra Youngme、Chaveng Pakawatchai、Wasit Somjitsripunya、Kandasamy Chinnakali、Hoong-Kun Fun
DOI:10.1016/s0020-1693(00)00032-3
日期:2000.5
The crystal structures of [Cu(dpyam)(2)(O(2)CCH(3))][BF(4)] (1) and [Cu(2)(dpyam)(4)(CO(3))][BF(4)](2). 4H(2)O (2) have been determined by X-ray analysis. 1 involves the distortion of the CuN(4)O(2) chromophore towards a square pyramidal (4 + 1 + 1*) stereochemistry which is best described as involving a square-pyramidal distorted octahedral stereochemistry of the six-coordinate CuN(4)OO' chromophore. Compound 2 has a dinuclear cation with five-coordinate copper(II) ions bridged asymmetrically by a bidentate carbonate ligand. Both copper(II) ions predominantly involve the distorted square-pyramidal (4 + 1) stereochemistry of the CuN(3)ON' chromophore. The polycrystalline ESR spectra of 1 and 2 are exchange coupled and temperature independent. In 2 the room temperature effective magnetic moment of 1.34 mu(B) indicates the partial spin pairing by antiferromegnetic coupling. (C) 2000 Elsevier Science S.A. All rights reserved.