Crystal and molecular structure of dichlorobis-(NN-dicyclohexylacetamidinato)methyltantalum(V)

Abstract

Crystals of the title compound are monoclinic, spacegroup P2₁/c with a= 13·521 (8), b= 13·084(8), c= 17·916(8)Å, β= 93·78(9)°, Z= 4. The intensities of 3198 independent reflections above background were collected by diffractometer methods and refined to R 0·080. The molecule is a seven-co-ordinate monomer, the tantalum being bonded to one methyl group [2·217(20)Å], two chlorine atoms [2·397(6), 2·430(6)Å], and four nitrogen atoms [2·160(7), 2·149(19), 2·040(17), 2·187(17)Å] of two bidentate ligands which are approximately perpendicular to each other. The geometry of the complex is considered in terms of a highly distorted pentagonal bipyramid but does not closely resemble any of the three ideal types of polyhedra usually found in seven-co-ordination.