Crystal structure of chloro{bis-[2-(diethylamino)ethyl]-2-(diphenylphosphino)ethylamine}cobalt(II) perchlorate

Abstract

The structure of the title complex has been determined by three-dimensional X-ray analysis from photographic data. The crystals are monoclinic, space group Cc, with Z= 4 in a unit cell of dimensions: a= 8·952 ± 0·003, b= 22·812 ± 0·011, c= 15·096 ± 0·004 Å, β= 104° 50′± 2′. The structure has been solved by Patterson and Fourier syntheses and refined by least-squares techniques to R 0·097 over 1115 independent observed reflections.

The complex consists of discrete cations and ClO^–₄ anions. The cobalt atoms are five-co-ordinate, with an N₃PCl donor set. The geometry of the co-ordination polyhedron can be described as a remarkably distorted trigonal bipyramid. This geometry can be better considered as a ‘capped tetrahedron’ with the central nitrogen atom of the tripod ligand unusually distant from the metal [Co–N(1) 2·30(3)Å]. Other distances in the co-ordination polyhedron are: Co–P 2·42(1), Co–N(2) 2·17(3), Co–N(3) 2·15(2), and Co–Cl = 2·28(1)Å.