A Synthetic, X-ray, NMR Spectroscopy and DFT Study of β-Naphthil Dihydrazone, Di(β-naphthyl)acetylene, Tetra(β-naphthyl)cyclopentadienone, and Hexa(β-naphthyl)-benzene: C<sub>6</sub>
(C<sub>10</sub>
H<sub>7</sub>
)<sub>6</sub>
Is a Disordered Molecular Propeller
作者:Laura E. Harrington、James F. Britten、Kirill Nikitin、Michael J. McGlinchey
DOI:10.1002/cplu.201600512
日期:2017.3
characterised by X-raycrystallography, but hexa(β-naphthyl)benzene exhibits rotational disorder of the peripheral substituents. Nevertheless, calculations at the density functional level reveal the favoured structure of 5 to be a molecular propeller, in which the eight possible rotamers are essentially iso-energetic. Variable-temperature NMR spectroscopy studies yield a naphthyl rotationalbarrier of approximately