New highly fluorescent hybrids (benz)imidazol-2-aminonicotinonitrile and -2-aminoisophthalonitrile: synthesis, characterization, fluorescence study, and theoretical calculations
2-aminonicotinonitrile and 2-aminoisophthalonitrile bearing a (benz)imidazole moiety. These compounds were prepared via microwave-promoted three-component reaction of 1-(1-methyl-1H-(benz)imidazole-2-yl)ethylidenedicarbonitrile, enolisable ketone, and propanedinitrile under solvent-free conditions. These two classes of compounds were found to be fluorescently active in solution at room temperature showing an intense