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Issue 29, 2009
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Ag(i) induced emission with azines having donor–acceptor–donor chromophore

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Abstract

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.

Graphical abstract: Ag(i) induced emission with azines having donor–acceptor–donor chromophore

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Supplementary files

Article information


Submitted
17 Nov 2008
Accepted
23 Apr 2009
First published
04 Jun 2009

Dalton Trans., 2009, 5683-5687
Article type
Paper

Ag(I) induced emission with azines having donor–acceptor–donor chromophore

D. Ray, E. S. S. Iyer, K. K. Sadhu and P. K. Bharadwaj, Dalton Trans., 2009, 5683
DOI: 10.1039/B820481K

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