Abstract:

Using solvatochromic method the determination of the molecular first-order hyperpolarizabilities of three novel stilbazolium-like dyes and twoknown stilbazolium-like dyes: trans-(pyrrol-2yl) -4-(N-methyl-pyridinio) -stilbazolium iodide(PPSI), trans-(furan-2-yl) -4-(N-methyl - pyridinio)-stilbazolium iodide (FPSI), trans-(thiophene-2-yl) -4- (N-methyl-pyridinio)-stilbazolium iodide (TPSI) and trans-(N-methylpyrrol-2-yl) 4-(N-methyl-pyridinio)-stilbazolium iodide (MPPSI), trans(4-N, N-dimethylamino) -(4- N-methylpwidinio) -stilbazolium iodide(DAPSI) in 8 solvents is presented, and their molecular hyperpolarizabilities are as high as 10-26 -10-27 esu. We have proved that the molecular hyperpolarizabilities is in linear correlation with the electron excessivities of donors for PPSI,FPSI and TPSI in each solvent, this relation give us a way to design molecules that have larger hyperpolallzabilities. Furthermore, our experiments show that the molecules of the five stilbazolium-like dyes have...更多 a larger dipolemoment, when they are in ground state than in excited state.

Key words: Stilbazolium-like dye, Pyridium, Hyperpolarizability, Solvatochromisml