Farrow, Charlotte and Halcovitch, Nathan Ross and Akien, Geoffrey Richard and Platts, James A. and Coogan, Michael Peter (2018) Self-assembly of singlet-emitting double-helical silver dimers : the curious coordination chemistry and fluorescence of bisquinolylpyridone. Dalton Transactions, 47 (11). pp. 3906-3912. ISSN 1477-9226
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Abstract
2,6-Bis(2-quinolyl)-4(1H)-pyridone 1, a novel quinoline analogue of the well-known ligand 2-terpyridone, shows unusual fluorescence with a large Stokes shift and low energy emission. Pyridine-pyridone tautomerism is investigated by NMR and theoretical methods and indicates that the low energy emission is from the pyridine form. 1 reacts with Ag(I) salts to give a double helical Ag2N6 core showing a BLUE shift in fluorescence with respect to the free ligand, which has been characterised experimentally and theoretically as involving an unusual mixed MLCT/ILCT excited state and emission from a singlet state