Charge transfer state of novel molecular complex C26H18Te2·C60·CS2 detected in single crystals by photoluminescence and ESR

Photoluminescence (PL), time resolved PL and optical absorption spectra near the band gap energy and in the range of IR active vibration modes of a novel molecular complex of fullerene, C26H18Te2·C60·CS2 (BTX C60·CS2), have been investigated. The new absorption band in the range 1100 cm−1, and a novel broad ESR signal have been found, indicating the optically excited charge transfer transition in the complex. The shift of the PL spectrum by 0.32 Ev towards lower energies (with respect to one in the C60 crystal), together with a long time decay of all PL lines, allows us to assume that the recombination is also accompanied by a charge transfer.