A study of the structures of aluminum complexes with isopropoxy and methyl groups using pulsed NMR and chemical ionization mass spectrometry.

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概要

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• The structures of aluminum complexes formed by the reaction of aluminum isopropoxide with trimethylaluminum was investigated by measuring the spin-lattice relaxation times, <I>T</I><SUB>1</SUB> for <SUP>1</SUP>H and <I>T</I><SUB>1</SUB><SUP>*</SUP> for <SUP>27</SUP>Al. The motion of the ligand of the complexes reflected upon the value of <I>T</I><SUB>1</SUB>, 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 <I>T</I><SUB>1</SUB><SUP>*</SUP>, which was about ten times as long at the center of the tetrameric complexes as at the wing of the dimeric complexes. The <SUP>13</SUP>C 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.

• 公益社団法人 日本化学会の論文

著者

• Fujiwara Yuzuru

  Central Research Laboratories, Kuraray Co, Ltd.

• Uetsuki Masao

  Central Research Laboratories, Kuraray Co, Ltd.

関連論文

• A study of the structures of aluminum complexes with isopropoxy and methyl groups using pulsed NMR and chemical ionization mass spectrometry.
• Structure of Ziegler-Natta catalysts for the polymerization of isoprene.

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