Collect. Czech. Chem. Commun. 2007, 72, 1069-1093

Synthesis and Study of Novel Benzothiazole Derivatives with Potential Nonlinear Optical Properties

Ivica Sigmundová, Pavol Zahradník* and Dušan Loos

Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University, 84104 Bratislava, Slovakia


The synthesis of new benzothiazole push-pull systems as candidates for NLO-phores is described. Spectral (UV/VIS and solvatochromic) and theoretical studies (electronic properties based on semiempirical AM1 and PM3 methods) of the prepared compounds were carried out. The structure and physico-chemical parameters affecting the push-pull character and intramolecular charge transfer (ICT) of the studied compounds have been investigated and compounds with enhanced hyperpolarizability β have been predicted. The benzothiazolium salts were found to be much more effective NLO-phores in comparison with the corresponding neutral benzothiazoles. The 4-NPh2 group is the most effective donor. The extension of conjugated bridge improves the studied NLO characteristics. An additional acceptor group bonded to the heterocycle causes a red shift of λmax but does not increase hyperpolarizability.

Keywords: Push-pull benzothiazoles; Alkenes; Dienes; NLO-phores; Intramolecular charge transfer; UV/VIS spectroscopy; Hyperpolarizability; Organic nonlinear optic materials.

References: 30 live references.