Anisotropic molecular packing of soluble C60 fullerenes in hexagonal nanocrystals obtained by solvent vapor annealing |
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Authors: | Renato Colle Giuseppe Grosso Alberto Ronzani Massimo Gazzano Vincenzo Palermo |
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Affiliation: | 1. DICAM-UNIBO, via Terracini 28, 40136 Bologna, Italy;2. NEST-CNR-NANO and DF-UNIPI, Largo Pontecorvo 3, 56127 Pisa, Italy;3. NEST-CNR and SNS, Piazza dei Cavalieri, 56127 Pisa, Italy;4. ISOF-CNR, via Gobetti 101, 40129 Bologna, Italy |
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Abstract: | We describe the self-assembly of soluble, chemically modified fullerene 6,6]-phenyl C61 butyric acid methyl ester (PCBM) into a new crystalline phase where the C60 moieties are arranged in parallel layers. Minimum C60 center-to-center distance is 10 Å within the layers, and up to 15 Å perpendicular to the layers. Highly anisotropic, mesoscopic hexagonal crystals of this material, with a lateral size of many microns and a thickness below 1 μm, 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 C60–C60 spacing indicates a high anisotropy in electrical and charge transport properties of this new phase. |
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