期刊
DYES AND PIGMENTS
卷 91, 期 1, 页码 62-73出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2011.02.012
关键词
Heterocyclic azo dyes; Thiazole; Hyper-Rayleigh scaterring (HRS) technique; Nonlinear optical (NLO) materials; Thermal stability; Photochromism
资金
- Fundacao para a Ciencia e Tecnologia (Portugal)
- Centro de Quimica and Centro de Fisica- Universidade do Minho [PTDC/QUI/66251/2006, FCOMP-01-0124-FEDER-007429]
- COMPETE/FEDER [PTDC/CTM/105597/2008]
- FEDER
- FCT
- [UMINHO/BI/142/2009]
- [UMINHO/BII/249/2009]
- Fundação para a Ciência e a Tecnologia [PTDC/CTM/105597/2008, PTDC/QUI/66251/2006] Funding Source: FCT
Two series of novel thermally stable second-order nonlinear optical (NLO) and photochromic chromophores have been designed and synthesized. The two series of compounds were based on different combinations of donor groups (pyrrole or thienylpyrrole) which act simultaneously as it-conjugated bridges, together with diazoaryl or diazothiazolyl as acceptor moieties. Their photochromic and electrochemical behavior were characterized, while hyper-Rayleigh scattering (HRS) was employed to evaluate their second-order nonlinear optical properties. The results of these studies have been critically analyzed together with two other related compounds reported earlier from our laboratories in which the thienylpyrrole system was used as the donor group keeping the functionalized diazoaryl as acceptor moiety. The measured molecular first hyperpolarizabilities and the observed photochromic behavior showed strong variations for the different donor systems used (pyrrole or thienylpyrrole) and were also sensitive to the acceptor strength of the diazenehetero(aryl) moiety. The thienylpyrrole based compounds endowed with extended pi-conjugated bridges and stronger donor auxiliary effects in comparison to the pyrrole compounds, when coupled to the stronger acceptor diazo(hetero)aryl groups gave rise to significantly larger hyperpolarizabilities (beta = 274-415 x 10(-30) esu) for an incident wavelength of 1064 nm. These compounds also displayed improved photochromic behavior with very fast response to the visible light stimulus (1.5 s) and fast thermal return to the original forms (2-3 s). (C) 2011 Elsevier Ltd. All rights reserved.
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