title: Nitrate/nitrite reductase activity of sulfido/selenido bridged dinuclear ruthenium(III) complexes.
abstract: Series of dinuclear species [Ru(2)(L)(2)(LH)(2)-mu-S(2)Cl(2)], [Ru(2)(L)(2)(LH)(4)-mu-Se(2)Cl(2)] (L=L(1)H and L(3)H) and [Ru(2)(L(2))(2)(L(2)H)-mu-Se(2)Cl(2)].2H(2)O, where L(1)H, L(2)H and L(3)H represent for 2-mercapto-5-phenyl-1,3,4-oxadiazole, 2-mercapto-benzimidazole and 2-mercapto-benzothiazole, respectively, have been prepared and characterized by their elemental analyses and spectral (IR, UV-visible, 1H NMR and FAB mass) data. The diamagnetism of these complexes are indicative of an exchange coupled dinuclear ruthenium(III) species containing S(2)(2-) and Se(2)(2-) bridges. The complexes along with free heterocycles (L(1)H-L(3)H) as well as RuCl(3) x 3H(2)0 were tested for their nitrate and nitrite reductase activities. The electrochemical behaviour of the complexes showed irreversible oxidation peaks at +(1.04-1.40) V quite comparable to those reported for sulphido bridged complexes.
authors.affiliation: Department of Chemistry, Banaras Hindu University, Varanasi 221005, India.
authors.forename: L
authors.initials: L
authors.lastname: Mishra
authors.forename: R
authors.initials: R
authors.lastname: Vilaplana
authors.forename: V K
authors.initials: VK
authors.lastname: Singh
authors.forename: A K
authors.initials: AK
authors.lastname: Yadaw
authors.forename: F
authors.initials: F
authors.lastname: González-Vilchez
mesh_terms: D004563:Electrochemistry; D006572:Heterocyclic Compounds, Bridged-Ring / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D008024:Ligands; D050901:Nitrate Reductase; D009565:Nitrate Reductases / Q000737:chemistry* / Q000378:metabolism*; D009572:Nitrite Reductases / Q000737:chemistry* / Q000378:metabolism*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D012275:Oryza / Q000201:enzymology; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D006572:Heterocyclic Compounds, Bridged-Ring; D008024:Ligands; D009942:Organometallic Compounds; D012428:Ruthenium; D009565:Nitrate Reductases; D009572:Nitrite Reductases; D050901:Nitrate Reductase