title: Synthesis, photoluminescence and biological properties of terbium(III) complexes with hydroxyketone and nitrogen containing heterocyclic ligands.
abstract: The ternary terbium(III) complexes [Tb(HDAP)3⋅biq], [Tb(HDAP)3⋅dmph] and [Tb(HDAP)3⋅bathophen] were prepared by using methoxy substituted hydroxyketone ligand HDAP (2-hydroxy-4,6-dimethoxyacetophenone) and an ancillary ligand 2,2-biquinoline or 5,6-dimethyl-1,10-phenanthroline or bathophenanthroline respectively. The ligand and synthesized complexes were characterised based on elemental analysis, FT-IR and (1)H NMR. Thermal behaviour of the synthesized complexes illustrates the general decomposition patterns of the complexes by thermogravimetric analysis. Photophysical properties such as excitation spectra, emission spectra and luminescence decay curves of the complexes were investigated in detail. The main green emitting peak at 548nm can be attributed to (5)D4→(7)F5 of Tb(3+) ion. Thus, these complexes might be used to make a bright green light-emitting diode for display purpose. In addition the in vitro antibacterial activities of HDAP and its Tb(III) complexes against Bacillus subtilis, Staphylococcus aureus, Escherichia coli and antifungal activities against Candida albicans and Aspergillus niger are reported. The Tb(3+) complexes were found to be more potent antimicrobial agent as compared to the ligand. Among all these complexes, [Tb(HDAP)3⋅bathophen] exhibited excellent antimicrobial activity which proves its potential usefulness as an antimicrobial agent. Furthermore, in vitro antioxidant activity tests were carried out by using DPPH method which indicates that the complexes have considerable antioxidant activity when compared with the standard ascorbic acid.
authors.affiliation: Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India.
authors.lastname: Poonam
authors.affiliation: Department of Chemistry UIET, Maharshi Dayanand University, Rohtak 124001, India.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India.
authors.forename: Priti
authors.initials: P
authors.lastname: Boora
authors.affiliation: Department of Pharmaceutical Science, Maharshi Dayanand University, Rohtak 124001, India.
authors.forename: Anurag
authors.initials: A
authors.lastname: Khatkar
authors.affiliation: Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India.
authors.forename: S P
authors.initials: SP
authors.lastname: Khatkar
authors.affiliation: Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India. Electronic address: v_taxak@yahoo.com.
authors.forename: V B
authors.initials: VB
authors.lastname: Taxak
mesh_terms: D000098:Acetophenones / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000975:Antioxidants / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D001424:Bacterial Infections / Q000188:drug therapy; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D006801:Humans; D008024:Ligands; D009181:Mycoses / Q000188:drug therapy; D009584:Nitrogen / Q000737:chemistry / Q000494:pharmacology; D010618:Phenanthrolines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D011804:Quinolines / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D013725:Terbium / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000098:Acetophenones; D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D000975:Antioxidants; D056831:Coordination Complexes; D008024:Ligands; D010618:Phenanthrolines; D011804:Quinolines; D013725:Terbium; C419881:2,2'-biquinoline; C006686:bathophenanthroline; D009584:Nitrogen; C025205:1,10-phenanthroline; C064382:xanthoxyline
keywords: Antimicrobial activity; Antioxidant; Bright green; Luminescence; Tb(3+)