Crystal and molecular structure of di-µ-carbonyl-carbonyl(tricarbonylcobalt)-π-indenyliron

Abstract

The crystal structure of the title compound has been determined by Patterson and Fourier methods from photographic X-ray diffraction data and refined to R 0·098, for 1899 unique reflections, by full-matrix least-squares. The monoclinic unit cell, space group P2₁/c, has dimensions a= 12·076 ± 0·014, b= 9·905 ± 0·010, c= 12·683 ± 0·012 Å, β= 97·5 ± 0·1°, for Z= 4. The molecule has the expected non-planar Fe(CO)₂Co bridging system, the angle between the two Fe(CO)Co planes being 148·0°. Distortions within the bridging system are apparent: Fe–C(br) 1·916(13) and 1·838(12), and Co–C(br) 1·960(13) and 2·054(12)Å. Fe ⋯ Co is 2·552(2)Å.