SYNTHESIS AND CHARACTERIZATION OF HEXADENTATE COBALT(III) COMPLEXES WITH NEW EDTA-TYPE LIGANDS PART 5 - STRUCTURE AND ABSOLUTE-CONFIGURATION OF THE TRANS(O-5)(-)(546)-ISOMER OF LITHIUM E-N,N,N'-TRIACETATO-N'-3-PROPIONATO)COBALTATE(III) MONOHYDRATE, (-)(546)-TRANS(O-5)-LI[CO(ED3AP)]CENTER-DOT-H2O - STRAIN ANALYSIS OF [CO(EDTA-TYPE)](-) CHELATES IN RELATION TO THEIR OCTAHEDRAL DISTORTION

The preparation and resolution of the two hexadentate Co(III) complexe s containing unsymmetrical edta-type ligands, [Co(ed3ap)](-) (A) and [ Co(u-eddadp)](-) (B) (ed3ap = ethylenediamine-N,N,N'-triacetate-N'-3-p ropionate ion; u-eddadp = ethylenediamine-N-diacetate-N'-di-3-propiona te ion) have been reexamined. The X-ray data are reported for the Lamb da-(-)(546)-trans(O)(5)-Li[Co(ed3ap)]. H2O for which the same (Lambda) absolute configuration was predicted from the CD sign pattern of the lowest energy band. The complex crystallizes in the space group P2(1) (#4) of the monoclinic crystal system with a = 6.523(4), b = 15.025(7) , c = 7.464(3) Angstrom, beta = 105.30(4)degrees, and Z = 2. The confo rmations of the chelate rings are found to be envelope for the glycina tes and skew-boat (half-chair) for the beta-alaninate ring. Structural parameters and strain analysis of [Co(edta-type)](-) chelates are dis cussed in relation to the structure of the ligand and octahedral disto rtion of complexes. The CD and LR (carboxylate region) spectra of comp lexes A and B are also discussed.