The Crystal and Molecular Structure of (2, 2, 2-Trichloro-1, 1-ethatiediOlato)triphenylantimony(V), Sb(Cl₃CCHO₂)(C₆H₅)₃

Abstract

The crystal and molecular structure of the title compound was determined by the single crystal X-ray diffraction method. The crystal is monoclinic with the space group P 2₁/n, a=15.531(10), b=10.7 98(5), c=11.8 93(5)Å, β=91.27(4)°, Z=4, and the final R valu e obtained was 0.048. The antimony atom is bonded with three phenyl carbon and two 1, 1diolato oxygen atoms and has a deformed square-pyramid geometry (its summit is occupied by a carbon atom). The four membered ring is almost on one plane (average deviation of the respective atomic positions from the average plane is 0.022Å). Two Sb-O bonds are about the same in their lengths (2.037Å on the average), and they are regarded as covalent bonds. The bond lengths of C-0 are 1.383Å on the average, and the angles O-C-O', C-O(or O')-Sb, and O-Sb-O' are 105.6, 99.4 (on the average), and 65.45° respectively. These data show that the ring is not much deformed or stressed. The compound is stable and can be regarded as a heterocyclic compound rather than a metal chelate.