Specific Recognition and Sensing of CN⁻ in Sodium Cyanide Solution

Abstract

Specific recognition of CN(-) in sodium cyanide solution was achieved using two imidazole-based receptors (A and B). Visually detectable color changes were associated with the formation of hydrogen bonded adducts, A.CN(-) and B.CN(-). Ratiometric fluorescence response was achieved for receptor A on binding to CN(-), and this reagent was used for imaging bacterial cells pre-exposed to 1.42 microM CN(-) solution.

Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the years 2010–2011

“…124) were used for the chromo-fluorogenic sensing of anion CN -. 165 Regarding the chromogenic response, the CH 3 CN:water (HEPES buffer) Ferrocene-fused imidazole dyads 256 and 257 (see Fig. 126 Carbazolo[1,2-a]carbazole receptor 259 (see Fig.…”

Fluorogenic and chromogenic heterocyclic thiourea: Selective recognition of cyanide ion via nucleophilic addition reaction and real sample analysis

“…Whereas, other anions including F  and AcO  ions fails to show sensitivity towards R1-R4 in 25% aqueous DMSO. Higher basicity (or nucleophilicity) as well as the lower hydration energy values [36] of cyanide ion (ΔH hyd = -67 kJ/mol) play a major role in selective detection of CN  ion over fluoride (ΔH hyd = -505 kJ/mol) and acetate (∆H hyd = -375 kJ/mol) ions. Thus, the much lower hydration energy of CN  ions preferably and selectively interact with R1-R4 in 25% organo-aqueous mixed solvent medium.…”

Synthetic Approaches to 2-Arylbenzimidazoles: A Review

“…[187]. Various derivatives of 2-phenyl-1H-anthra[1,2-d]imidazole-6,11-dione (20) were also prepared using methyl and hydroxy substituted benzaldehyde (13) in presence of sodium acetate in acetic acid under refluxing condition (Scheme 12) [188].…”