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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]

[Display omitted] • Sensor BMIP exhibits a naked eye colorimetric and fluorescence response towards Cu2+ ions. • BMIP responds rapidly toward Cu2+ ions with a low detection limit (7.84 nM). • The advances of BMIP as Cu2+ sensor have been verified for fingerprint imaging. • The sensor BMIP can be utilized for the determination of Cu2+ ions in environmental water samples. A new imidazole-based optical probe 2-((2-(benzo[ d ]thiazol-2-yl)hydrazono)methyl)-6-(4,5-diphenyl-1H-imidazol-2-yl)phenol (BMIP) as a colorimetric and fluorimetric chemosensor for detection of Cu2+ ions was synthesized and characterized by NMR spectra and mass spectra analysis. When exposed to Cu2+ ions in an aqueous environment even in presence of other cations, the probe BMIP exhibited striking color changes via a fluorescence-off process only for Cu2+ ions. The detection limit of Cu2+ was found to be 7.84 nM with response time as low as 10 s. In addition, BMIP -Cu2+ was found to be a reversible sensor with the addition of Ethylenediaminetetraacetic acid (EDTA). Experiments with test strips and with real water samples showed that the probe BMIP holds promise for identification of environmental ions. Density Functional Theory (DFT) computations with the Gaussian 16 software were employed to examine the BMIP sensing mechanism. The experimental findings were theoretically validated by DFT calculations. The application of BMIP as a Cu2+ sensor has been extended to live cell and fingerprint imaging. [ABSTRACT FROM AUTHOR]