Abstract：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 Hg2+,Cr3+ and Cu2+,with the fluorescence spectra a blue shift upon the addition of H+,Hg2+ or Cr3+,and a quenching effect on Cu2+.
2012, Vol. 36 
