title: 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 (approximately 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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India.
authors.forename: Debdas
authors.initials: D
authors.lastname: Ray
authors.forename: E Siva Subramaniam
authors.initials: ES
authors.lastname: Iyer
authors.forename: Kalyan K
authors.initials: KK
authors.lastname: Sadhu
authors.forename: P K
authors.initials: PK
authors.lastname: Bharadwaj
mesh_terms: D018360:Crystallography, X-Ray; D006835:Hydrazones / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry; D012834:Silver / Q000737:chemistry*
chemical_list: D006835:Hydrazones; D009942:Organometallic Compounds; D012545:Schiff Bases; D012834:Silver