Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 29, Pages 11868-11871Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja304082h
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Funding
- National Natural Science Foundation of China [21025205, 20972102, 21021001, 20902063, 21172159, 21172155]
- National Basic Research Program of China (973 Program) [2011CB808600]
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We have discovered that squaraine NCSQ easily react with ketones in the presence of ammonium acetate to form a novel type of squaraine CCSQ It is interesting to find that NCSQs exhibit unusual solid-state fluorescence, whereas CCSQs only exhibit fluorescence in solution. The quantum yield of solid NCSQ-g is measured to be 0.36, which is the highest among solid squaraines found so far. The large spectral overlap between the emission of NCSQs and the absorption of CCSQs, and the structural similarity of these molecules make them excellent energy-transfer (ET) pairs, as exemplified by the ET pair of CCSQ-1/NCSQ-g. When a very small amount (0.05 mol%) of CCSQ-g is doped into NCSQ-g, the ET efficiency reaches up to 96%. The Stern-Volmer quenching constant K-SV is calculated to be 65 800, indicating that CCSQ-1/NCSQ-g forms an extremely efficient ET pair. This study provides a novel skeleton and a facile route to efficient ET pairs.
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