Dependence of the intramolecular charge transfer on molecular structure in triazole bridge-linked optical materials

摘要

Four novel triazole bridge-linked fluorene derivatives with different terminal push/pull substituted groups were designed and controlledly synthesized via click chemistry based on Huisgen 1,3-dipolar cycloaddition reaction in high yields. Their structures were characterized and evaluated by FTIR, ~1H NMR, ~(13)C NMR, MS and elemental analyses, respectively. The results show that these triazole bridge-linked fluorene optical materials are almost prepared quantificationally by click chemistry. The intramolecular charge transfer (ICT) in these triazole bridge-linked fluorene optical materials was investigated by molecular emission and absorption spectra, and further confirmed by cyclic voltammetry (CV) technology and theoretical simulation calculation. It is found that the intramolecular charge transfer is significantly affected by molecular structure. ICT emission, ICT/locally excited (LE) mixture emission and LE emission were achieved by changing the terminal group in triazole bridged conjugates.