Two-photon absorption and the electrochemical properties of a conjugated heteroaromatic chromophore

The two-photon absorption and electrochemical, linear optical properties of a new π-conjugated heteroaromatic chromophore 9-ethyl-3-(2-{4-[5-(4-tert-butyl-phenyl)-[1, 3, 4]oxadiazol-2-yl]-phenyl}-vinyl)-car-bazole(VBPOEC)was explored. Two-photon absorption cross-section values of the chromophore in solution was investigated by a direct nonlinear transmission (NLT) method with nanosecond pulse. The maximum values of TPA was measured in 800 nm to be 1350GM for VBPOEC. The optical bandgap of VBPOEC was 2.77eV. The electrochemical properties was explored by cyclic voltammetry, the oxidation potential of VBPOEC was 1.059 V, which indicated the HOMO energy level was -5.80eV and the LUMO energy level was -3.03eV. These results provide a basis for understanding the electronic and optical properties of the conjugated heteroaromatic chromophore in terms of the underlying molecular and electronic structures.