对Fe^(3+)响应的双发色团荧光PVC膜光物理性质的研究

The photophysical properties of bichromophoric polyvinyl chloride film sensing for Fe^(3+)

以萘酰亚胺为发色团合成了两种具有光谱重叠的荧光量子产率较高的荧光小分子,并以两种小分子掺杂制备了聚氯乙烯(PVC)荧光膜。由于发生小分子间的能量转移现象,PVC膜表现单激发双发射峰,并且两处发射峰强度之比与两种小分子的摩尔比值相关。薄膜材料对酸碱具有一定稳定性,在水溶液中对Fe3+具有荧光猝灭选择性,并在一定范围内荧光强度与Fe3+浓度呈现一定的线性关系,此PVC膜有望成为环境监测中Fe3+响应传感器。

Two fluorescent compounds were synthesized based on naphthalimide. They presented high tluorescent quantum yields and strong spectral overlap. The fluorescent polyvinyl chloride （PVC） films were obtained through doping two 1,8-naphthalimide derivates. The energy transfer efficiency increased linearly with the con tent of acceptor, pH environments had no influence on the fluorescence of the film. Response of different metal cations on the fluorescence intensity of the film was investigated. Only Fe^3＋ ions exhibited remarkable fluores cence intensity quenching. Different linear relationship were received between the relative fluorescent intensity （Fo/F） at two emission wavelength and the concentration of Fe＇＋ in the different range of [Fe^3＋]. The film may be as potential efficient and selective sensors for water pollution by Fe^3＋ cations.