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

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Title Ag(I) induced emission with azines having donor-acceptor-donor chromophore
 
Creator RAY, D
IYER, ESS
SADHU, KK
BHARADWAJ, PK
 
Subject transition-metal ions
silver ion
fluorescent chemosensor
escherichia-coli
antimicrobial agent
energy-transfer
excited-state
cu-ii
ag-i
complexes
 
Description 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 (similar to 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.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2011-08-27T13:27:34Z
2011-12-26T12:57:56Z
2011-12-27T05:46:16Z
2011-08-27T13:27:34Z
2011-12-26T12:57:56Z
2011-12-27T05:46:16Z
2009
 
Type Article
 
Identifier DALTON TRANSACTIONS, (29), 5683-5687
1477-9226
http://dx.doi.org/10.1039/b820481k
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11674
http://hdl.handle.net/10054/11674
 
Language en