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
摘要:
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 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
摘要:
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.
Multi-donor incorporated organicdyes were designed and synthesized and their structure–property relationship was investigated in dye-sensitizedsolarcells (DSCs). Five N,N-disubstituted aniline donor groups along with carbazole and thiophene secondary donors were combined into the (D)n–π–A design with cyanoacrylic acid as the acceptor. The dyes showed broad absorption bands with absorption maxima