
pages 221-230
Available online: 21 Dec 2006Single crystals of molecular gyroscopes, 1,4-bis(3,3,3-triphenylpropynyl)benzene and 1,4-bis(triphenyl-silanylethynyl)-benzene were studied by single crystal X-ray diffraction (XRD) analysis and their packing tendencies were compared to those of analogous structures without the central phenylene rotator.