New crystal forms of tris(2-aminoethanolato-O,N)cobalt(III): Structures and properties

New crystal forms of tris(2-aminoethanolato-O,N)cobalt(III): Structures and properties Crystal forms of cobalt(III) tris(2-aminoethanolate) hydrates, i.e., red cubic crystals of the composition 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 methods. It was found that mer-[Co(NH2CH2CH2O)3] · 3H2O (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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Coordination Chemistry Springer Journals

New crystal forms of tris(2-aminoethanolato-O,N)cobalt(III): Structures and properties

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Publisher
Springer Journals
Copyright
Copyright © 2006 by Pleiades Publishing, Inc.
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry
ISSN
1070-3284
eISSN
1608-3318
D.O.I.
10.1134/S1070328406110121
Publisher site
See Article on Publisher Site

Abstract

Crystal forms of cobalt(III) tris(2-aminoethanolate) hydrates, i.e., red cubic crystals of the composition 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 methods. It was found that mer-[Co(NH2CH2CH2O)3] · 3H2O (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.

Journal

Russian Journal of Coordination ChemistrySpringer Journals

Published: Nov 6, 2006

References

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