Issue 29, 2009

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

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

Supplementary files

Article information

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

Dalton Trans., 2009, 5683-5687

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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