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高压下DPP-11超分子结构中的π-π相互作用

林奥雷, 王凯, 赵宇, 邹勃   

  1. 吉林大学超硬材料国家重点实验室, 长春 130012
  • 收稿日期:2007-11-22 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10
  • 通讯作者: 邹勃

π-π Interactions in DPP-11 Supramolecular Micellar Aggregates Under High-pressure

LIN Ao-Lei, WANG Kai, ZHAO Yu, ZOU Bo*   

  1. National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
  • Received:2007-11-22 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10
  • Contact: ZOU Bo

摘要: 通过金刚石对顶砧(DAC)高压装置产生高压, 利用原位高压同步辐射能量色散X射线衍射(EDXD)和同步辐射远红外光谱研究了压力对DPP-11[2,5-二-(11-十一醇基)-3,6-二-(2-噻吩基)-1,4-二酮吡咯并[3,4-c]吡咯]固体及其在水溶液中胶束体系的影响. 实验结果表明, 在准静水压条件下, DPP-11固体没有发生相变, 但随着压力的增加, 分子间的π-π相互作用明显增强. 在DPP-11胶束中发现了DPP-11固体中新的远红外吸收峰, 此峰随着压力的增加而蓝移, 这是由于胶束中π共轭染料基团的π-π相互作用增强所致.

关键词: 高压, 2,5-二-(11-十一醇基)-3,6-二-(2-噻吩基)-1,4-二酮吡咯并[3,4-c]吡咯(DPP-11), π-π相互作用, 同步辐射, 远红外光谱

Abstract: In-situ synchrotron X-ray diffraction and far-IR spectra of DPP-11{2,5-bis[11-(1-pyridinium)alkyl]-3,6-bis(2-thienyl)-1,4-dioxopyrrolo[3,4-c]pyrrole ditosylate salts} and its micelles in aqueous solution were studied. Although X-ray studies show no indication of phase transition, however, the π-π interactions become stronger with increasing pressure which can be deduced from far-IR spectra. A new far-IR absorption peak is found to be related to the π-conjugated aromatic dyes in DPP-11 micelles. Upon increasing pressure, the peak shifted toward higher wavenumber region due to the stronger π-π interactions.

Key words: High pressure, 2,5-Bis[11-(1-pyridinium)alkyl]-3,6-bis(2-thienyl)-1,4-dioxopyrrolo[3,4-c]pyrrole ditosylate salts(DPP-11), π-π Interaction, Synchrotron radiation, Far-IR spectrum

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