Abstract
Envision a crystalline material and you might think of atoms holding static positions within a regular molecular lattice. A new dendrimeric molecular rotor represents another extreme: In crystalline form, the molecule’s aliphatic framework stays stationary, but its 25 phenyl rings rapidly rotate (J. Am. Chem. Soc. 2016, DOI: 10.1021/jacs.6b01398). A team led by Xing Jiang, Miguel A. Garcia-Garibay, and Kendall N. Houk of UCLA constructed the molecule (shown), which has a phenylene core connected on each end to a triphenylpropynyl group. Each of those six phenyl rings in turn connects to another triphenylpropynyl group. The molecule consequently has three types of phenyl rings: one core phenylene, six branch phenylenes, and 18 peripheral phenyls. X-ray, NMR, and molecular dynamics data show that crystals of the compound are loosely packed and each of the three kinds of phenyl rings may rotate independently of the others. Within a particular set of phenyl rings,
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