Structural and dynamic properties of tetrahydroborate complexes

Makhaev, V.D.

Автор: Makhaev Viktor D.
Журнал: Russian Chemical Reviews
Том: 69
Номер: 9
Год издания: 2000
Издательство: Turpion - Moscow Ltd.
Местоположение издательства: United Kingdom
Первая страница: 727
Последняя страница: 746
DOI: 10.1070/rc2000v069n09abeh000580
Аннотация: Data on the structures of tetrahydroborate complexes from X-ray diffraction analysis, neutron and electron difraction, and IR and NMR spectroscopy are considered. It is shown that, in addition to the diversity of stabilising ligands, complexes of Group III and IV transition metals are characterised by the diverse types of coordination of terminal (η1-, η2- and η3- ) or bridging (between neutral molecular units) tetrahydroborate groups. Compounds with BH4 groups with different denticities can be found among these complexes. Most tetrahydroborates of these complexes comply with the principle of the maximum occupancy of the coordination sphere. Tetrahydroborates of Group III and IV transition metals exhibit clear-cut stereochemical non-rigidity (fluxionality): the protons of the BH4 ligand are equivalent on the NMR time scale. Group I and V-VIII transition metals form mainly η2-complexes, which are stereochemically much more rigid than complexes of Group III and IV metals. It is suggested that the electronic configuration of the central atom is the crucial factor determining different structures and stereochemical behaviours of the tetrahydroborate conplexes. Data on the post-transition and s-element tetrahydroborates are also consistent with this assumption. The bibliography includes 248 references.
Добавил в систему: Махаев Виктор Дмитриевич

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Structural and dynamic properties of tetrahydroborate complexesстатья Исследовательская статья

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