Synthesis and Emission Behavior of Double-armed Tetrathiacrown Carrying Two Naphthalenes

Abstract

Double-armed tetrathiacrown having two naphthalenes shows specifc photophysical properties for pd2+ and A U ~+ ions selectively, based on cooperative actions of parent thiacrown and fluorometric side arms.Photoresponsive supramolecular systems are of great significance particularly for their potential application 1 to nanoscale devices for cation sensor and switch.Recently, there are extensiveinvestigations toward the characterization of fluoroionophores including podand, crown ether, calixarene, cyclophane, and 2 cyclodexitrin derivatives with fluorophore.Thus, it is interesting to investigate the complex formation with guest cations using fluorescence spectroscopy.While, armed crown ethers such as lariat ethers and double armed crowns are a class of cation-host molecules, which are characterized by parent macrocyclic ring and ligating arms.3Since their cation-binding properties are essentially determined by coordination characters of macrocycle and donor arms, wide variations of basic structures may lead to the design of new and specific 4