Metal-ion induced FRET in macrocyclic dynamic tweezers

Abstract

a b s t r a c tWe report here about effective FRET process (73 99%) in mono Mg 2þ complexes of symmetrical crown ether bis(styryl) dyes. The FRET process has not been observed in the free state and in binuclear com plexes. The formation of mononuclear complex provides two styrylic fragments with appropriate posi tions of absorption and emission bands for FRET. The other important parameter for FRET is the proper geometric orientation of both chromophores, which attain sandwich conformation with close posi tioning of complexed and free styryl fragments induced by ion modulated geometry reorganization of the bis dye.