CRYSTAL-STRUCTURE AND PHOTOLUMINESCENCE OF SINGLE-CRYSTALS OF FULLERENE-9,9'-TRANS-BIS(TELLURAXANTHENYL) MOLECULAR-COMPLEX - C26H18TE2-CENTER-DOT-C-60-CENTER-DOT-CS2

The crystal structure of novel molecular complex of fullerene C-60 Wit h 9,9'-trans-bis(telluraxantheny): C26H18Te2 . C-60. CS2 (BTX . C-60. CS2) has been investigated by X-ray structural analysis. its photolumi nescence (PL) and optical reflectivity spectra have been examined. We have found that fullerene C-60, donor BTX and carbon disulfide CS2 mol ecules are situated at the inversion centers (1,0,1/2), (1/2,1/2,1), ( 1/2,1/2,1/2), respectively. The PL spectrum in C-60 + BTX is shifted b y 0.16 eV towards lower energies compared to C-60. The optical reflect ivity spectrum of C-60 + BTX is also different from that of C-60. The results are explained in terms of a decrease of the singlet exciton en ergy due to the strong interaction between C-60 and BTX molecules. The decrease of PL intensity in the new complex has been found to begin a t much lower temperature as compared to the pure C-60 crystals.