illustrates the ‘Click’ generation of 4-((1-((1-benzyl-1H-1,2,3-triazol-4-yl) methoxy) naphthalen-4-yl) (phenyl)methylene) naphthalen-1(4H)-one , a heterocyclic compound analyzed as an optical chemosensor for the selective detection of Cu(II) ions. The molecule is synthesized by [3 + 2] cycloaddition reaction of α-naphtholbenzein based terminal alkyne with 1-(azidomethyl) benzene under Cu(I)-catalyzed conditions