Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 20, Pages 5598-5602Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201701929
Keywords
anthracenes; bidentate ligands; CdSe nanocrystals; ligand design; upconversion
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Funding
- NSF [1532125]
- Direct For Mathematical & Physical Scien [1532125] Funding Source: National Science Foundation
- Division Of Materials Research [1532125] Funding Source: National Science Foundation
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Owing to the difficulty in comprehensively characterizing nanocrystal (NC) surfaces, clear guidance for ligand design is lacking. In this work, a series of bidentate bis(pyridine) anthracene isomers (2,3-PyAn, 3,3-PyAn, 2,2-PyAn) that differ in their binding geometries were designed to find the best complementary fit to the NC surface. The efficiency of triplet energy transfer (TET) from the CdSe NC donor to a diphenylanthracene (DPA) acceptor mediated by these isomers was used as a proxy for the efficacy of orbital overlap and therefore ligand binding. 2,3-PyAn, with an intramolecular N-N distance of 8.2 angstrom, provided the best match to the surface of CdSe NCs. When serving as a transmitter for photon upconversion, 2,3-PyAn yielded the highest upconversion quantum yield (QY) of 12.1 : 1.3%, followed by 3,3-PyAn and 2,2-PyAn. The TET quantum efficiencies determined by ultrafast transient absorption measurements showed the same trend.
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