Near-infrared chemodosimetric probes based on heptamethine cyanine dyes for the “naked-eye” detection of cyanide in aqueous media

Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

“…Till now, there were quite fewer reports of laser dyes in near-infrared (700-1000 nm) compared with other laser dyes, which cover mainly visible wavelength range, and many of these reports were not recent enough. IR-792 is categorized as Near-Infrared Fluorescence (NIRF) samples, which have shown significant potential in many applications that result in their firstly low high molar absorption coefficients, toxicity, broad absorption band, and versatility [1]. NIR dye has very high polarizability over the polymethine group in the ground state, which is resulting from strong forces of dispersion between two molecules of laser dye in solution [2].…”

Synthesis and Optical Properties of Near-Infrared meso-Phenyl-Substituted Symmetric Heptamethine Cyanine Dyes

“…Heptamethine cyanine dyes are a class of near infared fluorescence (NIRF) probes that have shown great potential in numerous applications due to their versatility, low toxicity, narrow absorption band, and high extinction coefficients [ 1 , 2 , 3 , 4 , 5 , 6 ]. These dyes are comprised of two terminal nitrogen-containing heterocycles linked together by a conjugated polymethine chain.…”

Near‐Infrared Fluorophores Based on Heptamethine Cyanine Dyes: From Their Synthesis and Photophysical Properties to Recent Optical Sensing and Bioimaging Applications

“…Heptamethine cyanine-based chemosensors (62 and 63) were developed for detecting CN À ions in aqueous solutions with high sensitivity and selectivity (Figure 7). [74] The chemical recognition of cyanide occurs through its nucleophilic addition to an indole salt, which ruptures the intramolecular charge transfer (ICT) process, suppresses fluorescence, and changes the color of the solution from green to bright yellow, even in the presence of interfering ions. The estimated detection limits of cyanines 62 and 63 were 0.017 μM and 0.20 μM, respectively.…”

“…The same group of researchers synthesized a sensor based on a heptamethine cyanine dye that contained a meso- Scheme 15. Cyanide sensing mechanism of 62 proposed by Li et al [74] triphenylamine moiety (64). [75] The compound detects cyanide via nucleophilic addition, which suppresses the fluorescence emission and changes the color of the solution from green to yellow.…”