Stereochemistry of some organic derivatives of Group Vb elements. Part V. Crystal and molecular structure of bis(isocyanato)triphenylantimony

Abstract

Crystals of the title compound are monoclinic, space group P2₁/n with Z= 4 in a unit cell of dimensions a= 11·920(3), b= 12·693(8), c= 12·270(3)Å, β= 90·22(1)°. The structure was solved by the heavy-atom method and refined by least-squares procedures to R 0·039 for 1643 observed diffractometer data. The NCO groups are N-bonded to antimony which has a trigonal bipyramidal configuration, with the N atoms axial. Mean molecular dimensions include: Sb–N 2·124(4), N–C 1·128(7), C–O 1·188(7), Sb–C 2·119(6)Å; N–Sb–N 178·6(6), Sb–N–C 145·4, and 152·2(6)°.