Collect. Czech. Chem. Commun. 1979, 44, 1070-1079

Crystal and molecular structure of dinickel(II) (S,S)-ethylenediamine-N,N'-disuccinate heptahydrate

František Pavelčík, Viktor Kettmann and Jaroslav Majer

Department of Analytical Chemistry, Pharmaceutical Faculty, Comenius University, 880 34 Bratislava


[Ni2(S,S)-EDDS].7 H2O structure has been solved by the heavy atom method and by the least squares method at R = 0.058; the substance crystallizes in orthorhombic system and space symmetry group P212121 with the lattice parameters a = 0.9904 (5), b = 1.2477 (8), c = 1.6036 (17) nm. The crystal structure is composed of the binuclear units Ni2(H2O)5[(S,S)-EDDS] and molecules of crystal water. The anion [(S,S)-EDDS]4- coordinates to Ni(II) as a stereospecific hexadentate ligand, the six-membered β-alanine rings being situated in equatorial plane of the coordination polyhedron, the glycine rings being axial. Absolute configuration of the complex anion is (OC-6-13-A).