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1,2‐Bis(trimethylsilyl)hydrazido Titanium Complexes
Author(s) -
Goetze Brigitte,
Knizek Jörg,
Nöth Heinrich,
Schnick Wolfgang
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200008)2000:8<1849::aid-ejic1849>3.0.co;2-e
Subject(s) - chemistry , trimethylsilyl , hydrazine (antidepressant) , moiety , titanium , single crystal , coordination complex , medicinal chemistry , inorganic chemistry , organic chemistry , crystallography , metal , chromatography
The silylhydrazido titanium complexes [Cl 2 Ti{N 2 H(SiMe 3 ) 2 } 2 ] ( 1 ), [ClTi{N 2 H(SiMe 3 ) 2 } 3 ] ( 2 ), and [(Cl 2 Ti) 2 {N 2 (SiMe 3 )} 2 ] ( 3 ) have been synthesized by reactions of the appropriate (trimethylsilyl)hydrazines with TiCl 4 in solution. The reactions are driven by the elimination of Me 3 SiCl 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 TiCl 4 with two or three equivalents of hydrazine, whereas compound 3 results from the reaction of two equivalents of TiCl 4 with two equivalents of hydrazine. According to the results of single‐crystal X‐ray diffraction investigations, complexes 1 and 3 feature an η 2 ‐coordination of the hydrazido moiety to the titanium. In the crystals of 3 , both a chair and a twist form of the six‐membered TiN 2 TiN 2 rings are found, corresponding to different donor coordination modes of the hydrazido ligands to titanium. Temperature‐dependent 29 Si NMR investigations indicate that both coordination modes co‐exist in solution at low temperatures, but not at room temperature.