M. Uetsuki, Y. Fujiwara
Mar 1, 1977
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0
Influential Citations
7
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The structures of aluminum complexes formed by the reaction of aluminum isopropoxide with trimethylaluminum was investigated by measuring the spin-lattice relaxation times, T1 for 1H and T1* for 27Al. The motion of the ligand of the complexes reflected upon the value of T1, which was about twice as long at the terminal position as at the bridge position, and decreased with increasing molecular weight. Coordination symmetry about the aluminum nucleus of the complexes governed the value of T1*, which was about ten times as long at the center of the tetrameric complexes as at the wing of the dimeric complexes. The 13C NMR signals of the isopropoxy group varied with the configuration of the ligands, while those of the methyl group were either broad or not observable. Chemical ionization mass spectra of the complexes supported the tetrameric and the dimeric structures determined from the results of NMR measurements.