27Al Nuclear Magnetic Resonance of Trialkyl Aluminum Compounds. I. Room-Temperature Studies

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Abstract
The compounds triethylaluminum, tri‐n‐propylaluminum, tri‐n‐butylaluminum, and tri‐n‐hexylaluminum were studied by nuclear magnetic resonance both in the pure state and in the solvents isopentane, n‐hexane, cyclohexane, and hexadecane. At low viscosities the linewidth was proportional to the viscosity times the cube of the molecular radius, and it is believed that the dominant relaxation mechanism is quadrupolar relaxation through molecular rotation. In high‐viscosity solvents this mechanism becomes unimportant. A mixture of aluminum alkyls produces a single Lorentzian shaped resonance which arises from rapid alkyl interchange.