Molecular Compasses and Gyroscopes: Engineering Molecular Crystals with Fast Internal Rotation
journal contributionposted on 07.01.2004 by Tinh-Alfredo V. Khuong, Gerardo Zepeda, Rebecca Ruiz, Saeed I. Khan, Miguel A. Garcia-Garibay
Any type of content formally published in an academic journal, usually following a peer-review process.
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, 13C CPMAS NMR, and 2H NMR quadrupolar-echo line-shape analysis revealed a lattice of molecules with phenylene groups experiencing rotary motion in the gigahertz regime near ambient temperature.