Kinetic study of the cis-trans isomerization in novel highly polarized dithiafulvenes

A. M. FRACAROLI, A. M. GRANADOS, R. H. DE ROSSI.

Los Cocos, Cordoba

Conferencia; 9na Conferencia Latinoamericana de Fisicoquímica Orgánica (CLAFQO9); 2007

Conferencia Latinoamericana de Fisicoquímica Orgánica (CLAFQO)

In the last few years, an enormous effort has been dedicated to study the nonlinear optical behavior of a great number of organic compounds for its potential use in photon technology, sensors, etc. In our laboratory we have synthesized a family of isomerically pure dithiafulvenes derivatives (1), from the reaction of ethynyl Fischer carbenes complexes with 5-RS-3H-1,2-dithiol-3-thione. It is known that nonsymmetrical and highly polarized organic molecules, such as 1, can have interesting nonlinear optics properties. The quadratic hiperpolarizability or susceptibility of nonlinear optics (betha) is depend on the geometry and the symmetry of the compound. In molecules that contain both a strong electron donor and electron withdrowing group, the intramolecular electron transfer, plays an important role and the greater the facility for the electron transfer, the greater becomes betha. The dithiafulvenes isomerizes in deutered chloroform to give mixtures of the corresponding Z and E isomers