Crystal structure and photoluminescence of single crystals of fullerene-9,9′-trans-bis(telluraxanthenyl) molecular complex: C26H18Te2 · C60 · CS2 Original Research Article

The crystal structure of novel molecular complex of fullerene C60 with 9,9′-trans-bis(telluraxantheny):C26H18Te2 · C60 · CS2 (BTX · C60 · CS2) has been investigated by X-ray structural analysis. Its photoluminescence (PL) and optical reflectivity spectra have been examined. We have found that fullerene C60, donor BTX and carbon disulfide CS2 molecules are situated at the inversion centers (1,0,12), (12, 112,1), (12,12,1),(12,12, 12), respectively. The PL spectrum in C60+BTX is shifted by 0.16eV towards lower energies compared to C60. The optical reflectivity spectrum of C60 + BTX is also different from that of C60. The results are explained in terms of a decrease of the singlet exciton energy due to the strong interaction between C60 and BTX molecules. The decrease of PL intensity in the new complex has been found to begin at much lower temperature as compared to the pure C60 crystals.