Crystal Structure of a New Modification of cis-Bis(pivalyltrifluoroacetonato)copper(II)

Powder and single-crystal X-ray diffraction study of cis-bis(pivalyltrifluoro-acetonato)copper(II) has been performed (Bruker AXS P4 automatic diffractometer, MoK_β radiation, t = −25°C). Crystal data for C₁₆H₂₀CuF₆O₄: a= 9.980(7) Å, b = 19.236(13) Å, c = 20. 771(14) Å, space group Pbca, V = 3987(5) ų, Z = 8, d_calc = 1.512 g/cm³. The square-planar environment of the Cu atom (Cu-O_av 1.904 Å, =O-Cu-O_av 92.4°) is completed to bipyramidal by the atoms of the neighboring molecules, Cu...F 2.78 Å and Cu...C_γ 3.30 Å. The complex forms centrosymmetric pseudo dimers with Cu...Cu distances of 4.59 Å.Original Russian Text Copyright © 2004 by S. A. Gromilov, I. A. Baidina, P. A. Stabnikov, and G. V. Romanenko__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 5, pp. 893–898, September–October, 2004.