A new carbazole-benzothiazole based chemodosimeter for chromogenic and fluorogenic detection of CN-

作者：Patra Lakshman; Aich Krishnendu; Gharami Saswati; Mondal Tapan Kumar^*

来源：Journal of Luminescence, 2018, 201: 419-426.

DOI：10.1016/j.jlumin.2018.05.020

• Chemodosimeter
• Carbazole
• Benzothiazole
• ICT
• Colorimetric and fluorogenic
• CN-
• DFT and TDDFT

A hybrid carbazole-benzothiazole based chemodosimeter (CB) has been synthesized for the colorimetric and fluorogenic detection of cyanide ion (CN-). Intra-molecular charge transfer (ICT) played important role for the detection of CN- in DMSO-water (4/1, v/v, pH = 7.2) solution. Upon treatment of CN- to the probe solution, results bleaching of the original yellow color of the probe with a large blue shift in absorption spectra. A large enhancement of the fluorescence intensity with a slight red shift is observed after addition of CN- to the probe (CB). Here, the nucleophilic addition of CN- inhibits the intra-molecular charge transfers (ICT) process responsible for the large enhancement of emission. The chemical reaction involved behind the sensing of CN- has been confirmed through H-1 NMR and mass spectroscopic studies. The density function theory (DFT) and time-dependent density function theory (TDDFT) has also been conducted to support the experimental findings.

• 出版日期2018-9