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@article{560973,
author = {Maďarová, M. and Sivák, M. and Kuchta, L. and Marek, Jaromír and Benko, J.},
article_location = {Cambridge},
article_number = {20},
keywords = {vanadium (V); peroxo complexes; X-ray structure; hydrogen bonds; NMR spectroscopy},
language = {eng},
issn = {1477-9226},
journal = {Dalton transactions : an international journal of organic chemistry},
title = {Molecular, supramolecular and solution structures of peroxovanadium complexes with ON and O3N donor set ligands: two new types of cationic-anionic peroxovanadium(V) peroxovanadates(V)},
volume = {2004},
year = {2004}
}
TY - JOUR
ID - 560973
AU - Maďarová, M. - Sivák, M. - Kuchta, L. - Marek, Jaromír - Benko, J.
PY - 2004
TI - Molecular, supramolecular and solution structures of peroxovanadium complexes with ON and O3N donor set ligands: two new types of cationic-anionic peroxovanadium(V) peroxovanadates(V)
JF - Dalton transactions : an international journal of organic chemistry
VL - 2004
IS - 20
SP - 3313-3320
EP - 3313-3320
PB - The Royal Society of Chemistry
SN - 14779226
KW - vanadium (V)
KW - peroxo complexes
KW - X-ray structure
KW - hydrogen bonds
KW - NMR spectroscopy
N2 - The complexes, [VO(O-2)(pa)(2)] ClO4 . 3H(2)O ( 1), [VO(O-2)(pa)(2)][ VO(O-2)(2)(pa)] . 3H(2)O (2), [VO(O-2)(pa)(2)][VO(O-2)( ada)] . 2H(2)O ( 3) and [VO(O-2)(pa)(pca)] . H2O ( 4) [pa = picolinamide, ada = carbamoylmethyliminodiacetate( 2-) and pca = 2- pyrazinecarboxylate(1-)], were synthesized. 2 and 3 are new types of peroxovanadium complexes: monoperoxovanadium diperoxovanadate ( 2) and monoperoxovanadium monoperoxovanadate ( 3). The complexes were characterized by chemical analysis and IR spectroscopy, and 1, 3 and 4 also by X-ray analysis. The structure of 1 is disordered, with alternating positions of the oxo and peroxo ligands. The peroxo oxygen atoms, O-p, in 1 are involved in weak hydrogen bonds with water molecules and close intramolecular C - H...O-p bonds [d(H...O-p) similar to 2.0 Angstrom]. The supramolecular structure of 1 is formed by a network of hydrogen bonds and strong attractive intermolecular pi - pi interactions between the pyridine rings. The supramolecular architecture in 4 is constructed by (N, O) - H...O hydrogen bonds between the neutral complex molecules and water of crystallization. The peroxo oxygen atoms in 4 form intramolecular C - H...O-p bonds [d( H...O-p) = 2.303 Angstrom]. The pa and pca ligands are ON coordinated via the oxygen atoms of the C(NH2)=O and COO- groups, respectively, and nitrogen atoms of the heterocyclic rings, and ada as a tetradentate O3N ligand. The thermal analysis of 4 showed that the loss of water of crystallization and the active oxygen release (T-min/degreesC 82, T-max/degreesC 165) are, under given conditions, individual processes separated by the temperature interval 90 - 132 degreesC. The solution structures and stability were studied by UV-VIS and V-51 NMR spectroscopies.
ER -
MAĎAROVÁ, M., M. SIVÁK, L. KUCHTA, Jaromír MAREK a J. BENKO. Molecular, supramolecular and solution structures of peroxovanadium complexes with ON and O3N donor set ligands: two new types of cationic-anionic peroxovanadium(V) peroxovanadates(V). \textit{Dalton transactions : an international journal of organic chemistry}. Cambridge: The Royal Society of Chemistry, roč.~2004, č.~20, s.~3313-3320. ISSN~1477-9226. 2004.
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