Spectroscopic Characterization of Heptamethine Cyanine Dyes for the Interaction with the CN^- and F^-

Abstract

The selectivity and sensitivity of a benzoindolium heptamethine cyanine dyes toward CN^- and F^- in DMSO are described. These anions interact with Dye-1 and Dye-2 forming anion-Dye adducts, the formation of which was supported by the Pariser-Parr-Pople molecular orbital (PPP MO) calculation. The different optical responses in Dye-1 stimulated by addition of CN^- (blue to pale yellow) and F^- (blue to pink) allow simultaneous estimation of CN^- and F^-.

Keywords:

• Heptamethine cyanine dye
• Anion recognition
• Orbital calculation
• Optical responses
• Chemosensing
• F^- and CN^-.

Acknowledgments

This work was supported by the Basic Science Research Program through the National Research Foundation (NRF) grant funded by the Korea government (MEST) (No. 2011–0001084). This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.