Acidopentaminecobalt(III) complexes with polyamine ligands. III. The crystal structure of β-chloro(ethylenediamine)(dipropylenetriamine)cobalt(III) tetrachlorozincate(II)

Abstract

The crystal structure of β-chloro(ethylenediamine) (dipropylenetriamine)cobalt(III) tetrachlorozincate(II), β-[Co(en)(dpt)Cl]ZnCl4, has been determined by three-dimensional X-ray diffraction techniques from 799 reflections collected at ambient temperature by multiple film methods. The stucture has been solved by the symbolic addition procedure and refined by full-matrix least-squares techniques to a conventional R factor of 8.0%. The salt cystallises in space group P21/c of the monoclinic system with 4 formula units in a cell of dimensions a = 7.875(3), b = 15.824(11), c = 14.748(8)Å, β = 94.69(5)°. The observed and calculated densities are 1.65 and 1.63 g/cm3 respectively. The cobalt atom is surrounded by one chlorine and five nitrogen atoms in an approximately octahedral configuration. The three nitrogen atoms of the dipropylenetriamine ligand (NH2(CH2)3NH(CH2)3NH2) are in a plane with one nitrogen atom of the ethylenediamine while the second nitrogen atom is trans to the chlorine atom. The orientation about the coordinated secondary amine nitrogen of the dipropylenetriamine is such that the NH proton is remote from the chlorine atom. The tetrachlorozincate(II) anion has a slightly distorted tetrahedral configuration, with an average ZnCl bond distance of 2.26(2) Å.