56566-64-4Relevant academic research and scientific papers
Ruthenium(II) complexes of thiosemicarbazones: Synthesis, X-ray crystal structures, spectroscopy, electrochemistry, DFT studies and fluoride sensing properties
Ghosh, Bipinbihari,Adak, Piyali,Naskar, Subhendu,Pakhira, Bholanath,Mitra, Partha,Dinda, Rupam,Chattopadhyay, Shyamal Kumar
, p. 1 - 14 (2017)
Six Ru(II) complexes with formula [Ru(terpy)(L)]X (L = tridentate N,N,S?donor thiosemicarbazone ligands, X = PF6?) have been synthesized and characterized by using standard analytical and spectroscopic techniques. The X-ray crystal structures of the complexes [Ru(terpy)(L2)]PF6(2) and [Ru(terpy)(L3)]PF6(3) have been determined. It was found that during complexation the hydroxyimino functionality of the parent ligands is converted to imine, which participates in coordination through the N-atom. The complexes are found to undergo two quasi-reversible oxidations on the positive side of the potential window (0 to +0.8 V) and three successive quasi-reversible/irreversible reductions on the negative side of the potential window (0 to ?2 V). The fluoride sensing properties of all the complexes have been studied in solution using absorption spectra and1H NMR studies, as well as by cyclic voltammetric (CV) measurements. From the absorption titration studies the association constants and detection limit values of fluoride by the complexes have been determined. The association constant values were found to be reasonably high (logKa> 5) for complexes 3–6, and these values are one order of magnitude greater than those observed for the corresponding free thiosemicarbazones. Selective fluoride sensing by these complexes is also signaled by the development of vivid colors, visible with the naked eye.
DNA binding and cleavage activities of cationic dinuclear copper(II) and nickel(II) Complexes with novel oximethiosemicarbazones
Haribabu,Hussain Reddy
experimental part, p. 996 - 1001 (2011/09/12)
Complexes of Cu(II) and Ni(II) with novel type of ligands, viz., diacetylmonoximethiosemicarbazone, diacetylmonoxime-N(4)- methylthiosemicarbazone, diacetylmonoxime-N(4)-ethylthiosemicarbazone and diacetylmonoxime-N(4)-phenylthiosemicarbazone have been synthesized and characterized based on molar conductance, magnetic moment, electronic, IR and ESR spectral data. Electrochemical behaviour of these complexes is investigated by cyclic voltammetric studies. The binding properties of these complexes with calf-thymus DNA have been investigated using absorption spectrophotometry. Cleavage activity of these complexes has been investigated on double stranded pBR 322 plasmid DNA by gel electrophoresis experiments in the absence and in the presence of oxidant.
