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Influence of ligand architecture on bridging bond strength in dimeric titanium aminoalkoxy-diolates

TitleInfluence of ligand architecture on bridging bond strength in dimeric titanium aminoalkoxy-diolates
Publication TypeJournal Article
Year of Publication2003
AuthorsKemmitt, T., Gainsford G. J., Al-Salim N. I., Robson-Marsden H., and Sevast'yanov D. V.
IRL TeamCarbohydrate Chemistry
JournalAustralian Journal of Chemistry
Volume56
Pagination1147-1152
KeywordsBond strength (chemical), Chelation, Complexation, Composition effects, Crystal structure, Dimers, dissociation, Ligand architecture, Metallorganic chemical vapor deposition, Monomers, nuclear magnetic resonance spectroscopy, Thermal effects, Titanium aminoalkoxydiolates, Titanium compounds, Tridentate methyldiethoxoamine ligand, X ray analysis
Abstract A series of mixed-ligand-titanium complexes is reported which incorporate a tridentate N-methyldiethoxoamine (mdea) ligand in conjunction with chelating diolate ligand. X-ray crystal structures of the complexes [Ti(mdea) (O-O)]2 (where O-O = OC(CH3)2C(CH3)2O (1), OC(C2H5)2C(C2H5)2O (2), OC(CH3)2CH2CH(CH3)O (3), and OC(CH3)2CH2C(CH3) 2O(4)) show them to exist as dimers in the solid state, with one arm of the aminodialkoxy ligand μ-bridging two titanium centres. Solution-state 1H and 13CNMR studies concur with the solid-state structures of (1)-(4) at low temperature. The room-temperature spectra of (3) and (4) suggest that bridging bond scission and reformation occurs increasing the apparent symmetry of the complexes. Complexes (3) and (4) dissociate into monomers in the vapour phase. The influence of the diolate ligand on the bridging bond strengths is discussed.
URLhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0345015992&partnerID=40&md5=cffb3c548f84c16c1c092768fd30a4ba
DOI10.1071/CH03056