Design and synthesis of an on–off “click” fluorophore that executes a logic operation and detects heavy and transition metal ions in water and living cells
Design and synthesis of an on–off “click” fluorophore that executes a logic operation and detects heavy and transition metal ions in water and living cells
We have designed and synthesized a novel fluorescent molecular probe using the Cu(I)-catalyzed Huisgen cycloaddition of 1,3-diethynyl-6-fluoroisoquinoline with 1-(2-azidoethyl)pyrrolidine. This water soluble âclickâ fluorescent chemosensor displays good sensitivity towards heavy and transition metal ions. It shows pronounced fluorescence enhancement and high selectivity for Zn2+ over other biologically relevant metal ions in water at pH 7.0. The fluorescence response of the bis-triazole derivative in the presence of Zn2+ is switchable and reversible as a function of pH. The chemosensor also exhibits fluorescence quenching with Fe2+ and Cu2+ in water at pH 7.0. A modified YES logic gate property has been proposed using the âturn-onâ and âturn-offâ behavior of the bis-triazole with Zn2+ and Fe2+. The sensor is cell membrane permeable and applicable for intracellular Zn2+ imaging.
Small molecules that stabilize G-quadruplex structures in telomeres can prevent telomerase enzyme mediated telomere lengthening and subsequently lead to cell death. We herein report two fluoro-isoquinoline derivatives IQ1 and IQ2 as selective ligands for humantelomericG-quadruplex DNA. IQ1 and IQ2 containing different triazolyl side chains have been synthesized by Cu (I) catalyzed azide–alkyne cycloaddition