Collect. Czech. Chem. Commun. 1980, 45, 1766-1774

Crystal and molecular structure of the tetradecahydrate of cobalt(II) (R,S)-ethylenediamine-N,N'-disuccinato-cobaltate(III)

František Pavelčík, Jiřina Soldánová and Jaroslav Majer

Department of Analytical Chemistry, Comenius University, 880 34 Bratislava


Crystals of Co3((R,S)-EDDS)2 . 14 H2O are monoclinic with lattice parameters a = 1.1393, b = 1.1856, c = 1.5267 nm, β = 114.6°. The space group is P21/c, Z = 2. The structure was solved by the heavy atom method and refined by the least squares method to R = 0.082. The crystals are composed of binuclear [CO2((R,S-EDDS)2]2- anions, [CO(OH2)6]2+ cations and crystal water molecules. The cobalt atom in [Co2((R,S)-EDDS)2]2- is coordinated octahedrally by two nitrogen atoms and three oxygen atoms from different carboxyl groups in a single [(R,S)-EDDS]4- molecule and one oxygen atom from a neighbouring [(R,S)-EDDS]4- molecule. The [Co(OH2)6]2+ cation is coordinated octahedrally.