Crystals of 1,4-bis[3,3,3-tri(3,4-ditertbutyl)phenylpropynyl]benzene 1c may be viewed as a collection of molecular gyroscopes having a central p -diethynylphenylene as a rotary element encased by two bulky triarylmethyl groups. Single-crystal X-ray analysis, 13 C CPMAS NMR, and 2 H NMR quadrupolar-echo line-shape analysis revealed a lattice of molecules with phenylene groups experiencing rotary motion in the gigahertz regime near ambient temperature.
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Khuong et al. (2003) studied this question.
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