NEW CRYSTAL FORMS OF TRIS(2-AMINOETHANOLATO-O,N)COBALT(III): STRUCTURES AND PROPERTIES
Date
2006
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Abstract
Crystal forms of cobalt(III) tris(2-aminoethanolate) hydrates, i.e., red cubic crystals of the composition fac-[Co(NH2CH2CH 2O)3] • 5.44H2O (fac-I • 5.44H 2O) and blue prismatic crystals of the composition mer-[Co(NH 2CH2CH2O)3] • 3H2O (mer-I • 3H2O) were studied by the 59Co, 13C NMR and X-ray diffraction methods. It was found that mer-[Co(NH2CH2CH2O)3] • 3H 2O (mer-I • 3H2O) is a new pseudopolymorphic modification of fac-[Co(NH2CH2CH2O) 3] • 3H2O (fac-I • 3H2O), while fac-I • 3H2O represents a new polymorphic modification of the complex mer-[Co(NH2CH2CH2O)3] • 3H2O (mer-I • 3H2O) described previously. The comparative analysis of the spectra revealed dynamic equilibrium between these geometric isomers; the fac-isomer is stable in aqueous solutions.
Description
Keywords
Engineering controlled terms Chemical modification, crystal structure, Isomers, Nuclear Magnetic Resonance, Organometallics, X ray diffraction Engineering uncontrolled terms Comparative analysis, Crystal forms, Prismatic crystals, Pseudopolymorphic modification Engineering main heading Cobalt compounds
Citation
COTOVAIA, Aliona, ȘOVA, Sergiu, SIMONOV, Iurie , ROȘU, Tudor, SANDU, Ion , GULEA, Aurelian. New crystal forms of tris (2-aminoethanolato-O,N)cobalt(III): Structures and propertie. În: Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya, 2006, vol. 32, pp. 841-847. ISSN 1070-3284