Imidazole-derived new colorimetric/fluorometric chemosensor for the sensitive recognition of CN− ions: Real-time application in food samples and fluorescence bio-imaging

•Imidazole derived new chemosensor for selective detection of CN− ions.•Sensor BMA responds rapidly toward cyanide ions with a low LOD (7.87 nM).•The detection mechanism of BMA with CN− has been studied extensively.•The sensor BMA can detect cyanide ions in live cells and food samples.