Second-order nonlinear optical responses of heptahelicene and heptathiahelicene derivatives
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- 作者：Benoî ; t Champagnea ; benoit.champagne@unamur.be" class="auth_mail" title="E-mail the corresponding author ; Sofiane Nouar Labidib
- 刊名：Chemical Physics Letters
- 出版年：2016
- 出版时间：16 January 2016
- 年：2016
- 卷：644
- 期：Complete
- 页码：195-200
- 全文大小：614 K
文摘
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βof helicenes built from fused benzenes and thiophenes result from subtle effects.
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Without substituents the first hyperpolarizabilities (β) are very small.
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βis enhanced when acceptor or donor groups are placed at terminal positions.
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When these are NO2 groups β is enhanced when helicenes contain few benzene rings whereas in the case of NMe2 groups the enhancement can be damped by three effects.
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These calculations suggest to replace thiophene by furan rings to achieve even larger β.