Crystal and molecular structure of (η5-trimethylsilylcyclopentadienyl)(η4-tetraphenylcyclobutadiene)cobalt |
| |
Authors: | M. Calligaris K. Venkatasubramanian |
| |
Affiliation: | Istituto di Chimica, Universitá di Trieste, 34127 Trieste Italy;Saha Institute of Nuclear Physics, Crystallography and Molecular Biology Division, Calcutta - 700009 India |
| |
Abstract: | The structure of (η5-trimethylsilylcyclopentadienyl)(η4-tetraphenylcyclobutadiene)cobalt, ((CH3)3SiC5H4)Co((C6H5)4C4), has been determined by single crystal X-ray diffraction techniques using three-dimensional data collected on an automatic diffractometer. The crystals are monoclinic, space group P21/c, with lattice parameters a 11.551(1), b 16.352(6), c 18.324(2) », β 122.85(1)° with four molecules in the unit cell. The structure consists of discrete molecules in which a cobalt atom is sandwiched between the η5-cyclopentadienyl (Cp) and the η4-cyclobutadience (Cb) ligands bonded to the metal in the hapto mode. The perpendicular distances Co?(Cp) and Co?(Cb) of 1.688 and 1.699 », respectively, as well as the dihedral angle of 6.9° between the two rings and the distortions of their side groups, indicate steric interactions within the molecule. The Cb ring is planar within 0.015 » and has a rectangular shape with edges of 1.480(5) and 1.463(3) ». The Cp ring, which is planar to within 0.005 », appears to be highly distorted by the trimethylsilyl group, which induces a lengthening of the C—C distances involving the substituted carbon atom (1.440(7) ») and a narrowing of the corresponding bond angle (105.3(2)°). |
| |
Keywords: | Author to whom correspondence should be addressed. |
本文献已被 ScienceDirect 等数据库收录! |
|