中文摘要：

运用Sonogashira偶联反应合成了一种具有分子内电荷转移（ICT）态的线型共轭化合物4,4＇-（2,5-二溴-1,4-苯乙炔）4,4＇-双（N,N-二甲基苯胺）,研究了其在不同溶剂、质子和不同金属离子存在时紫外光谱及荧光光谱的变化。结果表明,该化合物中存在从供电子基团-N（CH3）2到吸电子基-Br的ICT光谱：随着溶剂极性的增加,其荧光光谱从正已烷中415nm红移到DMSO中525nm。对质子及一些过渡金属离子如Hg^2＋、Cr^3＋、Cu^2＋有明显响应,在乙腈溶液中,当化合物中滴加H^＋、Hg^2＋与Cr^3＋时,其荧光光谱表现为蓝移,而Cu^2＋的加入则使化合物的荧光淬灭。

英文摘要：

A linear conjugative compound 4,4＇-（2,5-dibromo-1,4-phenylene）bis（ethyne-2,1-diyl）-bis（N,N-dimethylaniline） with intramolecular charge transfer（ICT） state was synthesized by Sonogashira cross-coupling reaction.Its UV-Visible and fluorescence spectral were investigated in different solvents and upon titration proton or metal cations.Our results indicated that the title compound underwent an intramolecular charge transfer from the electron-donor N,N-dimethylaniline to the electron-withdrawing group-Br.With the increase of the solvent polarity,the fluorescence spectra revealed a red shift from 415 nm in hexane to 525 nm in DMSO.In CH3CN solution,it seemed sensitive to proton and some transition metal cations,such as Hg^2＋,Cr^3＋ and Cu^2＋,with the fluorescence spectra a blue shift upon the addition of H^＋,Hg^2＋ or Cr^3＋,and a quenching effect on Cu^2＋.