Fluxional behavior of Al(Et)(q)2 (q=2-methyl-8-quinolinolato) studied by temperature dependent H NMR spectroscopy |
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Authors: | Takakazu Yamamoto Takayuki Iijima |
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Institution: | Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan |
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Abstract: | Two α-CH2 hydrogens of the Et group in Al(Et)(q′)2 (q′=2-methyl-8-quinolinolato) show two 1H NMR peaks at different positions with a separation of 0.19 ppm at 25 °C, due to the presence of a chiral center at Al. On raising the temperature, the two peaks collapsed, and coalesced above 100 °C. The 1H NMR fluxional behavior is accounted for by simultaneous rotation of the q′ ligands, and kinetic parameters of kJ mol−1, kJ mol−1, J K−1 mol−1 are evaluated. |
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Keywords: | Aluminum complex Fluxional Rotation of ligand |
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