Photostability of D–π–A nonlinear optical chromophores containing a benzothiazolium acceptor

0359974 - ÚFCH JH 2012 RIV GB eng J - Journal Article
Cigáň, M. - Gáplovský, A. - Sigmundová, I. - Zahradník, P. - Dědic, R. - Hromadová, Magdaléna
Photostability of D–π–A nonlinear optical chromophores containing a benzothiazolium acceptor.
Journal of Physical Organic Chemistry. Roč. 24, č. 6 (2011), s. 450-459. ISSN 0894-3230. E-ISSN 1099-1395
R&D Projects: GA ČR GA203/08/1157
Institutional research plan: CEZ:AV0Z40400503
Keywords : photooxidation * photostability * singlet oxygen
Subject RIV: CG - Electrochemistry
Impact factor: 1.963, year: 2011

For the practical application of second-order NLO materials, not only a high molecular quadratic hyperpolarizability β but also good thermal, chemical, and photochemical stabilities are required. Most of the state-of-the-art chromophores with high NLO response cannot be put to use because they are photochemically highly unstable. Good thermal and photochemical stabilities with preserved high hyperpolarizabilities can be achieved by replacement of an aromatic ring with easily delocalizable heteroaromatics, e.g., with benzothiazole. Furthermore, desirable modifications of the benzothiazole fragment lead to improvement in β values. Here we report results of a comprehensive investigation of the photochemical stability of seven D–π–A push–pull molecules based on a N-methylbenzothiazolium acceptor and a N,N-dimethylaminophenyl donor with a different length of conjugated bridge and different acceptor strength.
Permanent Link: http://hdl.handle.net/11104/0197641