Calculations based on the assumption that the silicon-phenyl group is a simple harmonic oscillator and a study of the infrared spectra of tetraphenylmethane, tetraphenylsilane, tetraphenylgermane, tetraphenyltin, and tetraphenyllead indicate that the asymmetrical silicon-phenyl stretching vibration should occur near 515 cm−1. A strong infrared absorption band near 515 cm−1 has been observed in the infrared spectra of twenty-two phenylsilanes of the types (C6H5)4Si, (C6H5)3SiX, (C6H5)2SiX2, (C6H5)2SiXY, and C6H5SiX2Y and has been assigned to the silicon-phenyl asymmetrical stretching vibration.
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