A promising strategy for two-photon absorption materials by novel dicarbazole-conjugated C_(60)/C_(70) fullerene derivatives

摘要

Two novel fullerene dyads C_(60)-CBP (3) and C_(70)-CBP (4) containing an electron donor 4,4-dicarbazole-1.1'-biphenyl (CBP) unit have been prepared through 1,3-dipolar cycloaddition reactions in situ. Their structures are characterized by ~1H NMR, ~(13)C NMR, FTIR, and MALD1-TOF-MS. Spectroscopic and electrochemical properties of 3 and 4 are studied in detailed by UV-vis, fluorescence, and cyclic voltammetric analysis, which present diminutive electronic interactions between the C_(60)/C_(70) and CBP units, and the half wave potentials of 3 and 4 are more negative than those of C_(60)/C_(70). The two-photon absorption (TPA) properties are determined for them by Z-scan method. Their geometric were optimized by the DFT calculations on the level at 6-31G (d,p) basis set.