Issue 10, 1981

Crystal structure and electronic properties of bis(2,2′-bipyridyl)-nitratocopper(II) nitrate monohydrate

Abstract

The crystal structure of the title compound [Cu(bipy)2(ONO2)][NO3]·H2O (bipy = 2,2′-bipyridyl) has been redetermined by X-ray analysis in the triclinic space group P[1 with combining macron] with a= 7.488(2), b= 10.017(2), c= 15.061 (2)Å, α= 106.183(4), β= 91.335(3), γ= 89.662(3)°, and Z= 2. The six-co-ordinate CuN2N′2OO′ chromophore has a (4 + 1 + 1*) stereochemistry related to the original square-based pyramidal stereochemistry by an asymmetrically co-ordinated nitrate group to give an unsymmetrical bicapped square-pyramidal structure. The single-crystal e.s.r. and polarised electronic spectra are reported and together are shown to offer the possibility of distinguishing this bicapped square-pyramidal structure from that of a (4 + 1 + 1*) distorted square-pyramidal structure or cis-distorted octahedral structure. A structural pathway is suggested to connect these three geometries of the [Cu(bipy)2(OXO)]+(OXO = ONO, O2CMe, or O2CH) cation by a linear combination of the S1a and S2a modes of vibration of the parent tris(chelate)copper(II) complex.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1981, 2070-2077

Crystal structure and electronic properties of bis(2,2′-bipyridyl)-nitratocopper(II) nitrate monohydrate

R. J. Fereday, P. Hodgson, S. Tyagi and B. J. Hathaway, J. Chem. Soc., Dalton Trans., 1981, 2070 DOI: 10.1039/DT9810002070

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