Molecular Design and Synthesis of Hetero-trichromophore for Enhanced Nonlinear Optical Activity

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• 作者：Junkuo Gao ; Yuanjing Cui* ; Jiancan Yu ; Zhiyu Wang ; Minquan Wang ; Jianrong Qiu ; Guodong Qian*
• 刊名：Macromolecules
• 出版年：2009
• 出版时间：March 24, 2009
• 年：2009
• 卷：42
• 期：6
• 页码：2198-2203
• 全文大小：161K
• 年卷期：v.42,no.6(March 24, 2009)
• ISSN：1520-5835

文摘

A new hetero-trichromophore (HT-1) was designed and synthesized by linking neutral-ground-state (NGS) chromophore 1 with zwitterionic (ZWI) chromophore 2, and their molecular structures were confirmed by elemental analysis, UV−vis absorption spectra, ¹H NMR, etc. Theoretical calculations show that there is a decrease of molecular dipole moments in gas phase when chromophores 1 and 2 are linked together. The polymer films were fabricated by doping trichromophore HT-1, NGS chromophore 1, and ZWI chromophore 2 into poly(4-vinylphenol) (PVPh). The second harmonic generation coefficients (d₃₃) of the films and the thermal stability of optical nonlinearities were measured by in situ second harmonic generation (SHG) measurement. The results show that almost a 5-fold enhancement in second harmonic coefficients (d₃₃) is realized as the combination of NGS chromophore and ZWI chromophore. The results indicate that NGS and ZWI chromophore combined hetero-trichromophores can efficiently improve the macroscopic optical nonlinearities in poled polymer materials.