(<I>E</I>) -スチルベン類の異常な結合長と大振幅ねじれ振動

概要

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Analyses of the X-ray diffraction data of (E) -stilbenes revealed that the X-ray structures of these compounds commonly show an unusually short bond length for the ethylene bond and a strong temperature dependence for the molecular structure. It is concluded that the short ethylene bond is an artifact caused by dynamic averaging originated from the torsional vibration of the C -Ph bonds during which the movement of the benzene rings are restrained minimum. The observed temperature dependence of the molecular structure is ascribed to the slight energy difference between the conformers which are interconverted by the torsinal vibration.
日本結晶学会の論文