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- W2040379924 abstract "Die Synthese der z. T. bekannten und neuen Vanadium(III)-silanolate [{V(OSiMet2Bu)3}2(THF)] (1), [Li(THF)2V(OSiMet2Bu)4] (2), [V(OSiMet2Bu)3(lut)] (3), V(OSiPh3)3(THF)3 (4), [Li(THF)4][V(OSiPh3)4](THF)2 (5), [Li(DME)VMes(OSiMet2Bu)3] (7), [Li(THF)4][VMes · (OSiPh3)3] (8), [Li(THF)4][VMes3(OSiMet2Bu)] (9) und Na[VMes3(OSiPh3)](THF)4 (10) sowie der Vanadium(IV)verbindungen [V(OSiPh3)4] (6), [VMes3(OSiMet2Bu)] (11) und [VMes3(OSiPh3)] (12) wird beschrieben. In der Mehrzahl der Fälle hat Vanadium die Koordinationszahl vier. Die dimere Struktur von 1 mit vier- bzw. fünffach koordiniertem Vanadium folgt aus der Molmassebestimmung, Massenspektren und seinem magnetischen Verhalten. Der Aufbau von 2, 4, 5, 9 und 11 wird durch Röntgen-Kristallstrukturanalyse bestimmt. 2 stellt ein verbrücktes Kontaktionenpaar dar, in dem beide Metallionen die Koordinationszahl vier haben. 4 bildet eine trigonale Bipyramide mit den THF-Liganden in axialer Stellung, und 5 sowie 9 kristallisieren als getrennte Ionenpaare mit tetraedrisch koordiniertem Vanadiumion. Die Struktur von 11 ist analog zu der von 9, wobei jedoch die erhöhte Oxydationszahl Konsequenzen hat. Die Vanadium(IV)verbindungen 6, 11 und 12 bilden sich bei der Oxydation der Vanadate(III) 5, 9 und 10. Synthesis and Structures of Vanadium(III) and Vanadium(IV) Silanolates The syntheses of the new and partially known vanadium(III)-silanolate complexes [{V(OSiMet2Bu)3}2(THF)] (1), [Li(THF)2V(OSiMet2Bu)4] (2), [V(OSiMet2Bu)(lut)] (3), V(OSiPh3)3(THF)3 (4), [Li(THF)4][V(OSiPh3)4](THF)2 (5), [Li(DME)VMes(OSiMet2Bu)3] (7), [Li(THF)4][VMes · (OSiPh3)3] (8), [Li(THF)4][VMes3(OSiMet2Bu)] (9), and Na[VMes3(OSiPh3)](THF)4 (10) as well as the vanadium(IV) compounds [V(OSiPh3)4] (6), [VMes3(OSiMet2Bu)] (11) and [VMes3(OSiPh3)] (12) are reported. In most cases the vanadium atom displays a coordination number of four. The dimeric structure of 1 with coordination numbers of four and five, respectively, has been deduced from molecular mass measurements, mass spectrometry and its magnetic properties. The crystal structures of compounds 2, 4, 5, 9 and 11 were resolved. Complex 2 resembles a bridged contact ion pair in which both metal centres are in a tetrahedral coordination environment. In 4 the ligands are arranged trigonal bipyramidally with the THF molecules in the axial positions. Complexes 5 and 9 crystallize in separated ion paires with the vanadium in a tetrahedral coordination sphere. The crystal structure of 11 is analogous to that of 9 but with consequences due to the higher oxidation state. Oxidation of the vanadates(III), e. g. 5, 9 and 10, yields the corresponding vanadium(IV) compounds 6, 11 and 12." @default.
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- W2040379924 date "1998-12-01" @default.
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- W2040379924 title "Synthese und Struktur von Vanadium(III)- und Vanadium(IV)-silanolaten" @default.
- W2040379924 doi "https://doi.org/10.1002/(sici)1521-3749(1998120)624:12<1994::aid-zaac1994>3.0.co;2-r" @default.
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