Abstract
It has been attempted to prepare Co 010-DTMA complexes by the reaction of [Co(DTMA)CO3] with various amines (ammonia, ethylenediamine, propylenediamine, pyridine, 2, 2'-dipyridyl, 1, 10-phenanthroline) or with amino acids (glycine, L-alanine, 8-alanine, L-phenylalanine and picolinic acid). Reactions at various conditions, especially at different temperatures, have been examined in order to obtain isomers with the different modes of DTMA coordination. The electronic spectra, the infrared spectra and the NMR spectra of the prepared complexes have been taken and discussed in comparison with those of the complexes with known structure. From the results of these spectrometric measurements as well as the elemental analyses, the configuration of the complexes have been estimated. It has been inferred that
(1) the pyridine complex, [Co(DTMA)(py)2 ](Cl04)2, may have the trans or the fl-fac(N) configuration,
(2) the other amine complexes possibly have the 8-mer(N) structure,
(3) both the cis (O) and the trans (O) isomers had been obtained in the glycinato, L-alaninato, and L-phenylalaninato complexes,
(4) only the trans (O) isomers had been isolated in the 8-alaninato and picolinato complexes. It has been recognized that the trans (O) isomers occur at higher temperature than the cis (4) isomers when both isomers had been obtained (3).
