An X-Ray Crystallographic Study of Cd[P(C-C₆H₁₁)₃]₂(NO₃)₂.CH₂Cl₂

Abstract

The crystal and molecular structure of bis ( tricyclohexylphosphine )cadmium(II) nitrate as its dichloromethane solvate, Cd [P(c-C₆H₁₁)₃]₂(NO₃)2.CH₂Cl₂, has been determined by single- crystal, three-dimensional X-ray diffraction methods. The crystals of the cadmium(II) complex are monoclinic with space group C2/c, a 20.880(6), b 12.775(3), c 17.075(5) Ǻ and β 106.38(2)°, Z 4. The structure was solved by normal Fourier methods and refined by a full-matrix least-squares procedure. The refinement used the 2169 statistically independent reflections for which I ≥ 2σ(I) converged with R and R_w of 0.065 and 0.067 respectively. The crystals consist of discrete Cd [P(c-C₆H₁₁)₃]₂(NO₃)₂ molecules and CH₂Cl₂ in the ratio 1 : 1. There is a distorted tetrahedral environment around the cadmium atom formed from the coordination of the two phosphines and two nitrates with each nitrate essentially occupying one stereochemical position. The two markedly different Cd -O bond lengths of 2.405(9) and 2.575(8) Ǻ show gross asymmetry in the coordination of the nitrate.