Pd(deen)Cl2 and Pd(deen)(CBDCA) complexes, where deen = N,Ndiethylethylenediamine and CBDCA= 1,1-cyclobutanedicarboxylate, were synthesized and characterized by elemental analysis and spectroscopic techniques. The stoichiometry and stability of the complexes formed between various biologically relevant ligands (amino acids, peptides, DNA constituents and dicarboxylic acids) and [Pd(deen)(H2O)2]2+ were investigated at 25 ?C and 0.1 M ionic strength. The speciation diagrams of the complexes formed in solutions are evaluated. The mode of coordination of glycylglycine is investigated by spectrophotometric measurements. The equilibrium constants for the displacement of coordinated ligands as inosine, glycine or methionine by mercaptoethylamine are calculated. The results are expected to contribute to the chemistry of antitumour agents.

A low cost and accurate method for the detection and analytical determination of the activity of the enzyme alpha-L-fucosidase (AFU) was developed. The method was based upon measuring the fluorescence intensity of the complex ion associate of the ion associate of rhodamine-B and the compound 2-chloro-4-nitrophenol (RB(+)CNP(-)) at 580 nm in phosphate buffer (pH 5) against the reagent blank. The influence of the different parameters, e.g. pH, incubation time, temperature, 2-chloro-4-nitrophenol concentration, foreign ions and surfactants that control the fluorescence intensity of the produced ion associate was critically investigated. The correlation between the fluorescence activity of the enzyme AFU by the developed procedures and the standard method was positive and highly significant in patients and controls (r(2)=0.99, p<0.001). The developed method is simple and proceeds without practical artifacts compared to the standard method.

A simple spectrophotometric method is proposed for the simultaneous quantification of the ozone (O3) and hydrogen peroxide (H2O2) mixture, the so-called peroxone. This method is based on the measurements of the absorbance of the I3- produced by the oxidation of I- by peroxone. The oxidation rates of I- by O3 and H2O2 are largely different and pH-dependent and, moreover, the oxidation of I- by H2O2 can be accelerated by a molybdate catalyst. In addition, the present method was successfully applied at concentrations as low as 10μM for the analysis of a real peroxone sample prepared by electrolysis of water. © Taylor & Francis Group, LLC.

A simple spectrophotometric method is proposed for the simultaneous quantification of the ozone (O3) and hydrogen peroxide (H2O2) mixture, the so-called peroxone. This method is based on the measurements of the absorbance of the I3- produced by the oxidation of I- by peroxone. The oxidation rates of I- by O3 and H2O2 are largely different and pH-dependent and, moreover, the oxidation of I- by H2O2 can be accelerated by a molybdate catalyst. In addition, the present method was successfully applied at concentrations as low as 10μM for the analysis of a real peroxone sample prepared by electrolysis of water. © Taylor & Francis Group, LLC.

Schiff base ligands are prepared via condensation of pyridine?2,6?dicarboxaldehyde with 2?aminothiophenol (H2L1) and 2?aminobenzoic acid (H2L2), respectively. The ligands arecharacterized based on elemental analysis, mass, IR and 1H NMR spectra. Metal complexes arereported and characterized based on elemental analyses, IR, 1H NMR, solid reflectance,magnetic moment, molar conductance, and thermal analyses (TG, DTG and DTA). The molarconductance reveals that all the metal chelates are non?electrolytes except Th(IV) H2L2complex which is 1:1 electrolyte . IR spectra show that H2L1 and H2L2 ligands behave asneutral tridentate ligands and bind to the metal ions via the two azomethine N and pyridine N. From the magnetic and solid reflectance spectra, it is found that the geometrical structures ofthese complexes are octahedral (Cr(III)? and Fe(III)?H2L1 and H2L2, Th(IV)?H2L2 and Mn(II)?H2L1 complexes) and triagonal bipyramidal (Co(II), Ni(II), Cu(II), Cd(II) and UO2(II)?H2L1 andH2L2 and Mn(II)?H2L2 complexes). The thermal behaviour of these chelates is studied using TGand DTA techniques and the activation thermodynamic parameters are calculated usingCoats?Redfern method. The synthesized ligands and their metal complexes were screened fortheir biological activity against bacterial species (Escherichia coli, P. vulgavis, B. subtilis and S.pyogones) and fungi (F. solani, A. niger and A. liavus). The activity data show that the metalcomplexes have antibacterial and antifungal activity more than the parent Schiff base ligandsagainst one or more bacterial or fungi species.

A novel electrode, with the composition Si/TiOx/Pt/TaO x (TiOx: titanium oxide, TaOx: tantalum oxide), was fabricated by spin-coating, and its effectiveness at electrochemical ozone generation was compared with that of a traditional Pt plate electrode. The electrode achieved a high current efficiency (1.3%) at a low current density (30mA·cm-2). The results confirm that TaOx is effective for the ozone generation in electrochemical ozone generation. Copyright © 2007 The Chemical Society of Japan.