TWISTED CHARGE-TRANSFER PROCESS OF NILE RED IN HOMOGENEOUS SOLUTION AND IN FAUJASITE ZEOLITE
TWISTED CHARGE-TRANSFER PROCESS OF NILE RED IN HOMOGENEOUS SOLUTION AND IN FAUJASITE ZEOLITE
复制标题
DOI：
10.1021/la00013a048
复制
发表时间：
1994-01-01
期刊：
影响因子：
3.9
通讯作者：
BHATTACHARYYA, K
中科院分区：
文献类型：
--
作者：
SARKAR, N;DAS, K;BHATTACHARYYA, K
本文报道了生物荧光探针尼罗红在均相溶液和13 X、LZY分子筛中的稳态和时间分辨发射光谱研究。结果表明，在中等高极性下，尼罗红的主要非辐射途径是扭曲的分子内电荷转移（TICT）过程，其速率随介质极性（E（T）（30））的增加而呈指数增加。由于这种极性依赖性TICT过程，尼罗红是生物环境微极性的敏感指示剂。从尼罗红在沸石X和Y中的排放特性与在均相溶液中的排放特性的比较，估计沸石13 X和LZY的E（T）（30）值为55.5 +/- 1。这表明沸石的极性与甲醇水溶液的极性相似。
Steady-state and time-resolved emission studies on Nile Red, a biological fluorescent probe, in homogeneous solutions and in zeolite 13X and LZY are reported. It is shown that at moderately high polarity the main nonradiative pathway of Nile Red is twisted intramolecular charge transfer (TICT) process, the rate of which increases exponentially with increase in polarity (E(T)(30)) of the medium. Due to this polarity-dependent TICT process Nile Red is a sensitive indicator of the micropolarity of biological environments. From the comparison of the emission properties of Nile Red in zeolite X and Y with those in homogeneous solutions the E(T)(30) values of zeolite 13X and LZY are estimated to be 55.5 +/- 1. This indicates the polarity of the zeolites is similar to that of an aqueous methanol solution.