SYNTHESIS AND CRYSTAL-STRUCTURE OF THE )-PYRROLIDYLMETHYL]-ETHANE-1,2-DIAMINE)COBALT(III) TETRACHLOROCOBALTATE(II) COMPLEX

A S)-pyrrolidylmethyl]ethane-1,2-diamine)cobalt(III) tetrachlorocobalt ate(II) complex was synthesized using trans-[Co-III(pyridine)(4)Cl-2]C l, and the crystal structure was determined by X-ray analysis. This st ructure was also confirmed by optical spectroscopy, including circular dichroism and absorption spectra. The trans-dichloro complex was orth orhombic, space group P2(1)2(1)2(1) (No. 19), a = 6.404( 1), b = 17.25 5(4), c = 23.701(2) and Z = 4. The conformations of the in-plane, cont aining metal and four donor atoms of ,N'-bis-[2(S)-pyrrolidylmethyl]et hane-1,2-diamine, were delta, lambda and delta gauche forms. The four nitrogen donor atoms were stereoselectively directed only to the SRRS coordination. The stereoselectivity in this complex may originate from the stereospecific characteristic of the ligands. (C) 1998 Elsevier S cience S.A.