1,2-Bis(trimethylsilyl)hydrazido Titanium Complexes

Autor: Wolfgang Schnick, Heinrich Nöth, Jörg Knizek, Brigitte Goetze
Rok vydání: 2000
Předmět:
Zdroj: ResearcherID
ISSN: 1099-0682
1434-1948
Popis: The silylhydrazido titanium complexes [Cl2Ti{N2H(SiMe3)2}2] (1), [ClTi{N2H(SiMe3)2}3] (2), and [(Cl2Ti)2{N2(SiMe3)}2] (3) have been synthesized by reactions of the appropriate (trimethylsilyl)hydrazines with TiCl4 in solution. The reactions are driven by the elimination of Me3SiCl or LiCl after the dilithiation of bis(trimethylsilyl)hydrazine. According to NMR, mass spectrometry, and X-ray structure determination, products 1 and 2 are formed by the reaction of one equivalent of TiCl4 with two or three equivalents of hydrazine, whereas compound 3 results from the reaction of two equivalents of TiCl4 with two equivalents of hydrazine. According to the results of single-crystal X-ray diffraction investigations, complexes 1 and 3 feature an η2-coordination of the hydrazido moiety to the titanium. In the crystals of 3, both a chair and a twist form of the six-membered TiN2TiN2 rings are found, corresponding to different donor coordination modes of the hydrazido ligands to titanium. Temperature-dependent 29Si NMR investigations indicate that both coordination modes co-exist in solution at low temperatures, but not at room temperature.
Databáze: OpenAIRE
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