| Autor: |
Guoqing Zhang, Shin Kim, Ruffin Evans, Byeong Kim, J. Demas, Cassandra Fraser |
| Předmět: |
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| Zdroj: |
Journal of Fluorescence; Sep2009, Vol. 19 Issue 5, p881-889, 9p |
| Abstrakt: |
Abstract A class of aryl trifluoromethyl-containing β-diketones were synthesized via one step Claisen condensation. These π-conjugated diketones exhibit strong solvatochromism from intramolecular donor-acceptor charge transfer (CT). In addition, fluorescence quantum yields (ϕf) and lifetimes (τf) were measured in different solvents. Diketones exhibit bathochromic shifts in emission spectra with increasing solvent polarity. Fluorescence changes upon Group II metal binding were also studied. Despite the relatively simple structure, the anthracene-CF3 diketone, atm, has strong binding affinity for Mg2+. A 70 nm blue shift and sixfold increase in intensity were observed upon addition of only one equivalent MgCl2 in ethanol solution. It also shows selectivity for Mg2+ binding even in the presence of excess Ca2+. Association constant (Ka) calculations suggest atm has two orders of magnitude stronger chelation for divalent magnesium than for calcium. These findings make atm an attractive starting point for molecular probe and light emitting material design. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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