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Structure and some properties of new formes of tris-(2-aminoethanolato-o,n) cobalt (III)

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: 2. A. COTOVAIA, S. SHOVA, Yu. A. SIMONOV, T. ROSHU, I. SANDU, A. GULEA,

Editorial: KOORDINATSIONNAYA KHIMIYA, 32 (11), p.873-880, 2006.

Rezumat:

Crystal forms of cobalt(III) tris(2-aminoethanolate) hydrates, i.e., red cubic crystals of the compo-
sition fac-[Co(NH2CH2CH2O)3] 5.44H2O (fac-I 5.44H2O) and blue prismatic crystals of the composition mer-
[Co(NH2CH2CH2O)3] 3H2O (mer-I 3H2O) were studied by the 59Co, 13C NMR and X-ray diffraction meth-
ods. It was found that mer-[Co(NH2CH2CH2O)3] 3H2O (mer-I 3H2O) is a new pseudopolymorphic modifica-
tion of fac-[Co(NH2CH2CH2O)3] 3H2O (fac-I 3H2O), while fac-I 3H2O represents a new polymorphic mod-
ification of the complex mer-[Co(NH2CH2CH2O)3] 3H2O (mer-I 3H2O) described previously. The compara-
tive analysis of the spectra revealed dynamic equilibrium between these geometric isomers; the fac-isomer is stable in aqueous solutions.

Cuvinte cheie: combinatii coordinative, Co(III), modificatii polimorfe, RMN si difractie de raze X // Coordinative combinations, Co(III), polymorph modifications, NMR and X-ray diffraction

URL: http://www.maik.rssi.ru/cgi-bin/search.pl?type=abstract&name=cochem&number=11&year=6&page=841