Solvent-induced multicolour fluorescence of amino-substituted 2,3-naphthalimides studied by fluorescence and transient absorption measurements
作者:Mayu Fujii、Misa Namba、Minoru Yamaji、Hideki Okamoto
DOI:10.1039/c6pp00048g
日期:2016.7
significantly reduced. Based on the fluorescence quantum yields and lifetimes, and transient absorption measurements, it has been revealed that internal conversion from the S1 state of ANIs to the ground state was accelerated by the protic medium, resulting in a reduction in their fluorescence efficiency, while intersystem crossing from the S1 state to a triplet state was not responsible for the decrease of
制备了一系列在1、5和6位具有氨基官能度的氨基-2,3-萘二甲酰亚胺衍生物(分别为1ANI,5ANI和6ANI),并基于稳定的测量系统地研究了它们的光物理性质态吸收和荧光光谱,荧光寿命以及瞬态吸收光谱。的ANI š有效地发荧光的溶液中,将发射光谱明显取决于溶剂极性偏移。随着溶剂极性的增加,1ANI仅显示出轻微的荧光红移。相比之下,5ANI和6ANI表现出明显的正溶剂光致变色现象,斯托克斯频移大,显示多色荧光;5ANI和6ANI的荧光颜色从己烷中的紫蓝色到甲醇中的橙红色不等。因此,5ANI和6ANI可用作微环境响应荧光团。在甲醇中,5ANI和6ANI的荧光发射带的强度显着降低。根据荧光量子产率和寿命以及瞬态吸收测量,已发现从ANI的S 1状态开始的内部转化质子介质加速了S到基态,导致它们的荧光效率降低,而从S 1状态到三重态的系统间交叉并不能导致荧光强度的降低。