Crystal and molecular structure of di-µ-carbonyl-dicarbonyl(triethyl-phosphine)cobalt(π-cyclopentadienylnickel)

Abstract

The crystal structure of the title compound has been determined by X-ray diffraction methods from three-dimensional counter data. The structure was solved by Patterson and Fourier methods and refined by a least-squares procedure to R 0·052 for 2853 unique reflections. The monoclinic unit cell, space group P2₁/c, has dimensions a= 8·945 ± 0·008, b= 10·462 ± 0·014, c= 20·005 ± 0·025 Å, β= 107·5 ± 0·1° for Z= 4. The molecule has the expected Ni(CO)₂Co bridging system, the angle between the two Ni(CO)Co planes being 133·7°. Distortions within the bridging system are apparent: Ni–C(bridge) 1·825(6) and 1·900(6), Co–C(bridge) 1·956(6) and 1·890(5)Å; Ni ⋯ Co is 2·4097(8) and Co–P 2·236(1)Å.