A new ratiometric and colorimetric chemosensor for cyanide anion based on Coumarin-hemicyanine hybrid

Zhenghao Yang, Zhipeng Liu, Yuncong Chen, Xiaoqing Wang, Weijiang He, Yi Lu

Research output: Contribution to journalArticle

Abstract

A hybrid coumarin-hemicyanine dye, Cou-BT, was developed as a new ratiometric and colorimetric sensor for cyanide with a sensing mechanism via nucleophilic addition of cyanide anion to the benzothiolium group. Cou-BT shows high sensitivity and selectivity for cyanide detection over other common anion species in aqueous acetonitrile solution. The calculated pseudo-first-order rate constant for cyanide anion addition was (2.13 ± 0.08) × 10 -2 s -1 at 298 K, and the detection limit was estimated to be 0.64 μM. The DFT and TDDFT calculation results suggest that the ratiometric and colorimetric sensing behavior of Cou-BT upon its reaction with cyanide was due to the interrupted π-conjugation and blocked ICT progress.

Original languageEnglish (US)
Pages (from-to)5073-5076
Number of pages4
JournalOrganic and Biomolecular Chemistry
Volume10
Issue number26
DOIs
StatePublished - Jul 14 2012

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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