Abstract
This work describes crystallographic investigations carried out on three copper(II) complexes. Bis(2,4,6-trichlorophenolato)bis(pyridine)copper(II) crystallizes in the triclinic system: a = 9.576 A, b = 9.017 A, c = 9.129 A, alpha = 125.61°, beta = 101.73°, gamma = 94.02°, Z = 1, space group P1. The structure was solved by Patterson and Fourier methods and refined by full-matrix least-squares to R = 0.039. The compound was found to be monomeric, and the stereochemistry at the copper to be the distorted elongated octahedral CUN[2]O[2]Cl[2] chromophore with a Cu-Cl bond length of 2.92 A. Bis (2-methoxy-4-nitrophenolato)bis(gamma-picoline) copper (II) also crystallizes in the triclinic system: a = 10.537 A, b = 10.521 A, c = 15.377 A, alpha = 121.031°, beta = 110.958°, gamma = 86.105°, Z = 2, space group P1. The structure was solved by Patterson and Fourier methods, supported by direct methods, and refined by full-matrix least-squares to R = 0.076. The stereochemistry at the copper has been found to be the distorted elongated octahedral CuN[2]O[4] chromophore. Bis(N,N'-dibenzylethylenediamine) copper(II) dibromide crystallizes in the monoclinic system: a = 12.872 AA, b = 21.074 A, c = 12.633 A, beta = 108.19, Z = 4, space group P2[l]/c. The structure was solved by Patterson and Fourier methods and refined by full-matrix least-squares to R = 0. 042. The stereochemistry at the copper atom was found to be a distorted square pyramid formed by four nitrogen and one bromine. The other bromine was a bromide ion, and molecules were linked across a centre of symmetry by two bromide ions. The plane of the copper atom and the three bromines to which it is linked is nearly normal to the plane of the four nitrogen atoms.