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Ag(i) induced emission with azines having donor-acceptor-donor chromophore
, E.S.S. Iyer, K.K. Sadhu, P.K. Bharadwaj
Published in
PMID: 20449081
Issue: 29
Pages: 5683 - 5687
Two azine molecules, [3-{4-(dimethylamino)phenyl}prop-2-en-1-ylidene] hydrazone (HL) and [4-(dimethylamino)benzylidene]hydrazone (LL) synthesized via Schiff base condensation, show an absorption band due to intra-ligand charge transfer (ILCT). Both ligands show weak emission in the absence of a metal ion as input. When Ag+ ions are added to either compound in THF, the metal ion gets bonded to the azine moiety resulting in a high intensity emission (∼400 fold). While Cu+ shows a slight enhancement of emission, other first-row transition, alkali or alkaline-earth metal ions do not show any emission allowing Ag+ ions to be detected in the presence of these metal ions. Both the Ag+ complexes were characterised by X-ray crystallography and show solid-state spectra similar to their solution spectra. Time-resolved fluorescence measurements done on the complexes show two excited-state lifetimes. © The Royal Society of Chemistry 2009.
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