Metal–carbonyl and metal–nitrosyl complexes. Part VI. The crystal and molecular structure of trans-di-µ-phenylthio-dinitrosylbis-(π-cyclopentadienyl)dichromium(I)

Abstract

Crystals of trans-[C₅H₅Cr(NO)SPh]₂ are orthorhombic, space group Pbcn, with four molecules in a cell of dimensions a= 11·75, b= 10·44, c= 17·51 Å. The molecule is situated on a crystallographic centre of symmetry, and the (CrS)₂ ring is therefore planar. A three-dimensional single-crystal X-ray analysis has shown that the cyclopentadienyl, nitrosyl, and sulphur ligands are arranged around each chromium atom in an approximately tetrahedral manner. The CrNO grouping departs from linearity by 10°, and the Cr–N bond (1·66 Å) has appreciable multiple-bond character. The Cr–C(cyclopentadienyl) bond lengths range from 2·17 to 2·25 Å, and the mean value (2·21 Å) is in good agreement with chromium–hydrocarbon distances in other complexes. The Cr–Cr distance is 2·950 Å.