IDENTIFICATION AND CHARACTERIZATION OF THE TRANS(O5) AND TRANS(O5O6) ISOMERS OF HEXADENTATE RHODIUM(III) COMPLEX OF 3-PROPANEDIAMINE-N,N'-DIACETIC-N,N'-DI-3-PROPIONIC ACID

Rhodium(III) complexes with the hexadentate ligand, propanediamine-N,N '-diacetate-N,N'-di-3-propionate ion (1,3-pddadp) have been prepared, chromatographically separated and isolated into two geometrical isomer s with respect to the N-O chelate ring size (trans(O5) and trans(O5O6) ). The H-1 and C-13 NMR and electronic absorption spectra were used to characterize the Rh(III) complexes. The C-13 NMR spectra for two isom ers of the corresponding [Co(1,3-pddadp)]- complex of known geometry ( trans(O5O6) and trans(O6)) are also reported. The related edta-type co mplexes of known structure were used as references for assignment of c omplexes studied.