結晶中の異常に短い結合長と大振幅分子内運動

概要

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It is shown that the ethylene bond in (<I>E</I>) -stilbenes is often observed unusually short by X-ray diffraction. Detailed analyses of the temperature dependent X-ray structures reveal that the short ethylene bond is an artifact caused by a dynamical disorder originating from the large amplitude torsional vibration of the C-Ph bonds, during which the movement of the benzene rings is restrained to be a minimum. Origin of the unusually short ethane bond in the X-ray structures of polyarylethanes is also discussed by a similar model.
社団法人有機合成化学協会の論文