The Crystal Structure of Trans-dichloro-diethylenediamine-cobalt. (III). Chloride Hydrochloride Dihydrate, [Coen2Cl2]Cl·HCl·2H2O

Abstract

Abstract The crystal structure of trans-dichlorodiethylenediamine-cobalt (III) chloride hydrochloride has been determined using the rotation method (Fe Kαλ=1.937 a.). The substance crystallizes in a monoclinic lattice with two formula units in the unit cell, the dimensions of which are a= 10.68 a., b=7.89 a., c=9.09 a. with β=110°26. The determined structure seems most easily described as consisting of layers of [Coen2Cl2]+ ions parallel to the plane (100) and those of Cl−, H2O and H+. Two chlorine atoms are co-ordinated to a cobalt atom in trans-positions. The line joining them is perpendicular to the plane in which four nitrogen atoms are found to lie. The dimensions of a complex ion are given. The water molecules probably form a group [H2O···H···H2O]+ together with a proton, O···O distance being 2.66 a. These groups are located between them. The dichroism of the crystal is, discussed on the basis of the determined structure.