Raman spectroscopy of intermolecular charge transfer complex between a conjugated polymer and an organic acceptor molecule
Raman spectroscopy of intermolecular charge transfer complex between a conjugated polymer and an organic acceptor molecule
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DOI：
10.1063/1.2767266
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发表时间：
2007-09-14
影响因子：
4.4
通讯作者：
Paraschuk, D. Yu.
中科院分区：
文献类型：
--
作者：
Bruevich, V. V.;Makhmutov, T. Sh.;Paraschuk, D. Yu.
用拉曼光谱和光学吸收光谱研究了聚[2-甲氧基-5-（2-乙基己氧基）-1，4-亚苯基亚乙烯基]（MEH-PPV）与2，4，7-三硝基芴酮（TNF）在电子基态形成的分子间给体-受体电荷转移复合物（CTC）。MEH-PPV和TNF的混合导致CTC吸收带出现在两种组分的光学带隙中，并且导致特征MEH-PPV拉曼带的变化，包括位移、带宽和强度的变化。实验数据在膜和溶液中是相似的，表明在两者中CTC形成。我们将最强MEH-PPV拉曼谱带在1580 cm（-1）附近的低频位移（达到5 cm（-1））与从MEH-PPV到TNF的部分电子转移（总计约0.2e（-））相关联。我们认为聚合物共轭链段可以形成组成可变的CTC MEH-PPV：TNF=1：X，其中X
Intermolecular donor-acceptor charge transfer complex (CTC) formed in the electronic groundstate between poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and 2,4,7-trinitrofluorenone (TNF) has been investigated by Raman and optical absorption spectroscopies. Blending of MEH-PPV and TNF results in appearance of the CTC absorption band in the optical gap of the both components and in changes in the characteristic MEH-PPV Raman bands including shifts, change in bandwidth, and intensity. The experimental data are similar in films and solutions indicating the CTC formation in both. We associate the low-frequency shift of the strongest MEH-PPV Raman band at similar to 1580 cm(-1) reaching 5 cm(-1) with partial electron transfer from MEH-PPV to TNF amounting similar to 0.2e(-). We suggest that polymer conjugated segments can form the CTC of variable composition MEH-PPV:TNF=1:X, where X