Anisotropic molecular packing of soluble C-60 fullerenes in hexagonal nanocrystals obtained by solvent vapor annealing

作者：Colle Renato^*; Grosso Giuseppe; Ronzani Alberto; Gazzano Massimo; Palermo Vincenzo

来源：Carbon, 2012, 50(3): 1332-1337.

DOI：10.1016/j.carbon.2011.11.003

We describe the self-assembly of soluble, chemically modified fullerene [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) into a new crystalline phase where the C-60 moieties are arranged in parallel layers. Minimum C-60 center-to-center distance is 10 angstrom within the layers, and up to 15 angstrom perpendicular to the layers. Highly anisotropic, mesoscopic hexagonal crystals of this material, with a lateral size of many microns and a thickness below 1 mu m, are obtained from chloroform solution by solvent vapor annealing, and characterized by optical microscopy and X-ray diffraction. The crystalline structure is deduced combining experimental data with molecular modeling and ab initio calculations. The large difference in C-60-C-60 spacing indicates a high anisotropy in electrical and charge transport properties of this new phase.

• 出版日期2012-3