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[Display omitted] • The receptor CS-02 has been synthesized via simple Schiff's base reaction and specifically used for the detection of CN− ion. • The interaction ability of CS-02 towards CN− ion detection was found from Job's method (1:1, L:M) and Limit of detection is 10.39 × 10−5 M respectively. • Practical utility of CS-02 for specific detection of CN− was examined with different real samples and test kit. In the present work, a simple and highly selective colorimetric chemosensor (CS-02) , was designed and synthesized from 5(4) - amino-4(5) -(amino carbonyl)-imidazole hydrochloride and 5-(4-chloro phenyl) furan-2-carbaldehyde. The formation of the CS-02 (E)-5-amino-N-((5-(4-chlorophenyl) furan-2-yl) methylene)-1H-imidazole-4-carboxamide was confirmed by 1HNMR and Mass spectral techniques. The receptor CS-02 was found to show a colorimetric response of the colour change from Light yellow to Cyber yellow towards CN− ion, due to de-protonation and intra-ligand charge transfer. The receptor CS-02 interacts with cyanide in a 1:1 stoichiometric manner with a detection limit of 10.39 × 10−5 M. Receptor CS-02 could be recyclable by treatment with TFA. The sensing behaviour of the receptor was further enunciated by computational studies and it's also be efficiently used to detect trace amounts of cyanide present in Real samples such as tobacco, flax seeds, apple seeds, cigarette and Indian cigarette. Moreover, a visible colorimetric kit such as a test paper strip would be used in the CS-02 for practical applications. [ABSTRACT FROM AUTHOR]

In this article, we reported a new poly(diacetylenes)-based sensor (PDA-IBA) for silver ion detection and reduction through the chelation of imidazole moiety. The poly(diacetylenes) polymer functionalized with imidazole groups. As the concentration of silver ions in the solution increased, the PDA surface underwent oxidation concurrently with the reduction of silver ions was demonstrated through imidazole receptor. This chemical reaction resulted in a noticeable change in the color of the solution, shifting from blue to dark red. The limit of detection (LOD) was determined to be 0.034 mM. Zeta potential data analysis and electrochemical measurements further confirmed the PDA-IBA was capable to reduce Ag+ into Ag0. Moreover, the silver species produced were validated through inductively coupled plasma optical emission spectrometry (ICP-OES). Additionally, the color change observed in PDA-IBA as a response to silver ions was effectively demonstrated by integrating it into a paper-based sensor. This study introduces an innovative and promising approach for enhancing the capabilities of chemosensors in detecting and reducing Ag+. [Display omitted] • A highly sensitive and selective Ag + sensor, poly(diacetylenes)-based chemosensor PDA-IBA was synthesized. • The PDA-IBA polymer displayed a color change in the presence of Ag + through a chemical reduction process. • The silver ion's reduction was demonstrated by zeta potential data analysis and ICP-OES. [ABSTRACT FROM AUTHOR]