PREPARATION AND CHARACTERIZATION OF 2 GEOMETRICAL-ISOMERS OF THE AQUA(ETHYLENEDIAMINE-N,N,N'-TRI-3-PROPIONATOPROPIONIC ACID)CHROMIUM(III) COMPLEX - X-RAY STRUCTURE OF CIS-EQ-[CR(HEDTP)(H2O)].5H2O

Two geometrical isomers for [Cr(Hedtp)(H2O)] (Hedtp = ethylenediamine-N,N,N'-tri-3-propionatepropionic acid) were obtained from the most stable diastereoisomer of [Cr(edtp)]- (edtp = ethylenediamine-N,N,N',N'-tetra-3-propionate) by passing through a column of cation-exchange resin in the H+ form. The geometrical structure of one isomer (H-1) was found to be cis-eq by using the X-ray diffraction method. Crystal data for cis-eq-[Cr(Hedtp)(H2O] . 5H2O are monoclinic with space group P2(1)/c: a = 9.796(6), b = 15.195(6), c = 14.825(2) angstrom, beta = 94.70(4)-degrees and Z = 4. The geometrical structure of another isomer (H-2) was assigned to trans-eq on the basis of the H-2 NMR and the magnetic circular dichroism (MCD) spectra.