ORGN 593 |
| Design and development of supramolecular systems with a switching function is an area of intense research activity. A vast variety of switches have been synthesized based on systems whose emission properties can be modulated by external input; however, most of these show only "on/off switching" function of single fluorescence emission. Herein, we describe a simple-structured molecule (L1), containing anthracene fragments at both ends of diethylenetriamine, behaves as a fluorescent molecular switch with pH-controlled absolutely switchable dual-mode fluorescence; each mode consists of monomer (pH < 9) and excimer (pH > 9) emissions, where the latter mode is "on" according to the formation of the intramolecular change transfer (ICT) complex in the ground state, via pH-induced pi-stacking interaction of two fluorophores and solvation of water molecules. |
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Heterocycles, Aromatics, Metal-Mediated Reactions and Syntheses, Materials, Devices, and Switches
8:00 PM-10:00 PM, Wednesday, 29 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster
Division of Organic Chemistry |