Abstract: The electronic spectra of 1,4-bis(phenyl ethynyl)benzene 1 and 1,4-bis[(4-t-butylphenyl) ethynyl] benzene 2 in fourteen solvents were measured, and the solvent effects were studied by using Linear Regression Program QSAR. It is found that the v_max^UVand v_max^FL of the compounds varied with (n²-1)/(2n²+1), (ε-n²)(2ε-n²)/ε(n²+2)²and (ε-1)/(ε+2)-(n²-1)/(n²+2) of the solvents. The attractive forces between the molecules of the solutes and the molecules of the solvents are mainly dispersion force.

Key words: 1,4-Bis (substituted phenyl ethynyl) benzene, Electronic spectra, Solvent effect