Synthesis and characterization of novel, thermally stable 2-aryl-5-dicyanovinylthiophenes and 5-aryl-5′-dicyanovinyl-2,2′-bithiophenes as potentially promising non-linear optical materials
作者:Cyril Herbivo、Alain Comel、G. Kirsch、A. Maurício C. Fonseca、M. Belsley、M. Manuela M. Raposo
DOI:10.1016/j.dyepig.2010.01.006
日期:2010.8
Two series of dicyanovinyl-substituted compounds namely 2-aryl-5-dicyanovinylthiophenes and 5-aryl-5'-dicyanovinyl-2,2'-bithiophenes were synthesized through Knoevenagel condensation of the corresponding 2-aryl-5-formyl-thiophenes and 5-aryl-5'-formyl-2,2'-bithiophene precursors. In contrast, the 2-aryl-5-formyl-thiophenes precursor were prepared through the Vilsmeier Haack Arnold reaction starting from inexpensive and easily available precursors such as acetophenones; this method produced the title compounds in higher yield than that recently reported which involved the Suzuki coupling of functionalized aryl boronic acids with 5-bromo-2-formyl-thiophene. Electrochemical studies and characterization of both the linear and non-linear optical properties and thermal properties indicated that good non-linearity was complemented by exceptional thermal stability for some chromophores, making them potential candidates for several optoelectronic applications such as solvatochromic probes and non-linear optical materials. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of 5-aryl-5′-formyl-2,2′-bithiophenes as new precursors for nonlinear optical (NLO) materials
作者:Cyril Herbivo、Alain Comel、G. Kirsch、M. Manuela M. Raposo
DOI:10.1016/j.tet.2008.12.078
日期:2009.3
A series of formyl-substituted 5-aryl-2,2′-bithiophenes 5 were synthesized using two different methods: Vilsmeier–Haack–Arnold reaction (VHA) or through Suzuki coupling. The synthesis of compounds 5 through the Vilsmeier–Haack–Arnold reaction, starting from inexpensive and easily available precursors such as acetophenones, gave the title compounds in low yields after four reaction steps. On the other
Theoretical and experimental studies of aryl-bithiophene based push-pull π-conjugated heterocyclic systems bearing cyanoacetic or rhodanine-3-acetic acid acceptors for SHG nonlinear optical applications
作者:Sara S.M. Fernandes、Cyril Herbivo、João Aires-de-Sousa、Alain Comel、Michael Belsley、M. Manuela M. Raposo
DOI:10.1016/j.dyepig.2017.10.001
日期:2018.2
understand how structural modifications influence the electronic, linear and nonlinearoptical properties. The push-pull conjugated chromophores 2–3 bear a bithiophene spacer conjugated with a phenyl ring functionalized with N,N-dialkylamino electron-donor groups together with cyanoacetic or rhodanine-3-acetic acid acceptor groups. Theoretical (DFT calculations) and experimental studies were carried