Synthesis and crystal structures of new C60 complexes with asymmetric tetrathiafulvalenes

New charge transfer complexes of fullerene C60 with two types of tetrathiafulvalenes: bis(4,5-dihydronaphtho[1,2-d])-tetrathiafulvalene (BDHN-TTF(C60)2C7H8, 1) and three bis(alkylthio)ethylenedithio-tetrathiafulvalenes (CnTET-TTF(C60)x, where x=2, n=2 (2); x=1.5, n=4 (3); x=3, n=7 (4)) were obtained. Compounds 1 and 2 were studied by single crystal X-ray diffraction. In both crystal structures, the three-dimensional (3D) packing of fullerene molecules formed by waved dense hexagonal layers was revealed. The donor molecules arranged in the fullerene framework attain bent conformation to fit to the spherical fullerene surface. Intermolecular contacts have typical van der Waals lengths. According to optical data, the complexes obtained have a neutral ground state with the charge transfer bands at 11×103 cm−1.