Author/Authors :
Boeglin، نويسنده , , A. and Barsella، نويسنده , , A. and Fort، نويسنده , , A. and Mançois، نويسنده , , F. and Rodriguez، نويسنده , , V. and Diemer، نويسنده , , V. and Chaumeil، نويسنده , , H. and Defoin، نويسنده , , Heather A. K. Jacques، نويسنده , , P. and Carré، نويسنده , , C.، نويسنده ,
Abstract :
Pyridinium phenoxides are model compounds associating large dipole moments with high optical nonlinearities. A progression of sterically hindered forms of such zwitterions has been synthesized in order to investigate their structure/property relationships. Their UV–vis absorption in acetonitrile has been analyzed as a function of concentration in order to assess the presence of aggregates and the level of protonation. The quadratic optical properties have been measured by the EFISH and hyper-Rayleigh techniques and are interpreted via semi-empirical calculations. The solvation model used leads to results that agree with our experimental findings indicating an increased response for intermediate twist angles.
