Molecular complexes of fullerene C60 with aromatic hydrocarbons containing flexible phenyl substituents

Abstract

New C₆₀ molecular complexes with aromatic hydrocarbons containing flexible phenyl substituents 2TPE·C₆₀ (1) (TPE = tetraphenylethylene), TPB·C₆₀ (2) (TPB = 1,3,5-triphenylbenzene), 2TPB·C₆₀·C₆H₅Cl (3), DPA·C₆₀ (4) (DPA = 9,10-diphenylanthracene), and PA·C₆₀·C₆H₆ (5) (PA = 9-phenylanthracene) have been synthesized. Crystal structures of 1–4 have been studied. It has been shown that in the structures of 1, 2 and 4 the layers of the C₆₀ molecules alternate with the layers composed of the hydrocarbon ones. The phenyl substituents of hydrocarbons occupy the cavities formed in the layers of the C₆₀ molecules. In the structure of 3 the C₆₀ molecules form columns, which are separated by the pairs of stacked TPB ones. The IR spectra indicate a neutral ground state of the complexes. The charge transfer band (CTB) with its maximum at 630 nm has been found only in the UV-visible spectrum of 4 indicating the π-interaction of DPA and C₆₀ in the complex.