Second-order nonlinear optical property of polyphosphazenes containing charge-transporting agents and indole-based chromophore

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• 作者：Zhen Li ; Wei Gong ; Jingui Qin ; Zhou Yang and Cheng Ye
• 关键词：Polyphosphazene ; Synthesis ; Indole
• 刊名：Polymer
• 出版年：2005
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：2005
• 卷：46
• 期：13
• 页码：4971-4978
• 文件大小：290 K

摘要

A new post functional strategy was developed to prepare polyphosphazenes with a high density of the indole based chromophore (nitro-indole or sulfonyl-indole chromophores) and carbazolyl side groups. Thus polyphosphazene (P1) with carbazolyl and indole groups was first prepared by direct nucleophilic substitution reaction with poly(dichlorophosphazene). Then, polyphosphazenes (P2–P4) containing charge-transporting agent (carbazolyl groups) and indole azo chromophores were synthesized via a post azo coupling reaction between P1 and p-nitrobezenediazonium fluoroborate or p-ethylsulfurylbenzenediazonium fluoroborate in N-methylpyrrolindone (NMP). The structures of P1–P4 were characterized, and the poled film of P2–4 revealed a resonant d₃₃ values in the range of 7–26 pm/V by second harmonic generation (SHG) measurements.