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Spectroscopic characterization of Cu(II) complex of l-phenylalanine and d,l-tryptophan

In this work, the reactions involving L-phenylalanine and D,L-tryptophan in the presence of Cu(II) ion were studied. Optimum conditions for the reactions were established as pH 7 and lambda=641 nm. When the reaction was kinetic, it was observed that the following rate formula was found as dA/A(n)=k dt and k=3.2 x 10(-4)s(-1), according to absorbance measurements. Using a perpetual change curve, the ratio of [Cu]/[Cu]+L-phenylalanine+[D,L-tryptophan] was found 1:1:1. According to this result, one molecule of L-phenylalanine and one molecule of D,L-tryptophan react with one molecule Cu(II) ion.

Investigation of the Reaction Kinetics of o‐Phenylenediamine in the Presence of Cu(II)

Abstract The reactions involving o‐phenylenediamine (OPDA) in the presence of Cu(II) was studied and the reaction rate was found to be v = k[Cu2+]/[o‐phen]. Using a perpetual change curve, the ratio of [Cu2+]/[o‐phen] was found to be 1:1. The rate equations perpetual change curve demonstrates that one molecule of OPDA reacts with one Cu2+ ion and a monoimine is formed as the transfer of one electron occurs in the oxidation reaction.

Complexation, thermal and catalytic studies of N-substituted piperazine, morpholine and thiomorpholine with some metal ions

Several Cu(II), Pt(II) and Ni(II) complexes of N-substituted, piperazine (NN donor), morpholine (NO donor) and thiomorpholine (NS donor) derivatives were synthesized and their thermal behavior and catalytic activity in epoxidation reaction of cis-diphenylethylene were studied using oxygen sources NaOCl. The coordination compounds of Cu(II), Pt(II) and Ni(II) having general formula [MLCl]Cl, [ML2l]Cl2 or [ML]Cl2 with tetra coordinated geometry around metal ions have been isolated as solid. All the ligands and complexes were identified by spectroscopic methods and elemental analysis, magnetic measurements, electrical conductance and thermal analysis. A square planer structures have been proposed for all complexes. The thermal stability of the complexes discussed in terms of ligands donor atoms, geometry and central metal ions. The complexes have a similar thermal behavior for the selected metal ions. The thermogravimetric analyses suggest high thermal stability for most complexes followed by thermal decomposition in different steps. The decomposition processes were observed as water elimination, chloride anion removal and degradation of the organic ligands. Catalytic ability of the complexes were examined and found that all the complexes can effectively catalyze the epoxidation of cis-stilbene with NaOCl.

Practical Synthesis of Pioglitazone: Ligand Substitution Reaction With Oxido Vanadium(IV) and Biological Activity

The authors performed two types of experiments: the reduction of 5-{4-[2-(5-ethyl-2-pyridyl)etoxy]benzilidine}-2–4- thiazolidinedione to pioglitazone (5-{4-[2-(5-ethyl-2-pyridyl) etoxy]benzil}-2–4-thiazolidinedione) with magnesium/methanol and the synthesis of an oxidovanadium(IV) complex of pioglitazone in methanol under refluxing conditions. The structures of pioglitazone and its oxidovanadium(IV) complex were analyzed by using physicochemical and spectroscopic techniques. Comparisons of the spectral measurements of pioglitazone with those of its oxidovanadium(IV) ion complex are useful in determining the atoms of the ligand that are coordinated to the metal ion. In addition, antibacterial and antifungal activities of the complex were studied and the complex is screened against bacteria and fungi.

Investigation of the wettability and washing, perspiration and rubbing fastness of denim fabric in the presence of some nano-metal oxides and nano-Ag

Abstract In this study, we analysed finished denim fabric for hydrophobic wettability, washing, perspiration and rubbing fastness of TiO2 (anatase), CuO, ZnO and Ag nanomaterials. The presence of nanoparticles on dyed denim fabric surfaces was confirmed by Scanning Electron Microscope and EDAX. According to the contact angle, washing, perspiration and rubbing fastness measurements, these nanomaterials were improved surface properties of denim fabric. The coatings made by these nanomaterials increased hydrophilic or hydrophobic properties by changing wetting capability of denim fabric surface. Additionally, nano-metal oxide particles were improved fastness values. The highest contact angle and fastness values were found on denim fabric treated with nano-TiO2 (anatase) and the lowest contact angle and fastness values were found for denim fabric plated with nano-Ag.

Syntheses, Spectroscopic, and Thermal Characterization of Cu(II), Ni(II), and Pt(II) Complexes of Some Tridentate Ligands

The study emphasized azomethine coordination compounds of Pt(II), Cu(II), and Ni(II) having tetracoordinate geometry around the metal ions with the general formula, [MLCl]Cl, where L, azomethine have been isolated in the solid state. All the ligands were identified by spectroscopic methods and elemental analysis. The synthesized coordination compounds have been characterized by FTIR, magnetic measurements, elemental analysis, electrical conductance, and thermal analysis. Square planar structures have been proposed for the Ni(II) and Pt(II) complexes. Magnetic susceptibility measurements and electronic spectra of the complexes sustain the proposed square planer structures. The complexes thermally stable and this thermal stability is discussed in terms of ligands donor atoms, geometry and central metal ions. Azomethine complexes have a similar thermal behavior for the selected metal ions. The TG analyses suggest high thermal stability for most complexes followed by thermal decomposition in different steps. The decomposition processes were observed as water elimination, chloride anion removal, and degradation of the organic ligands. Supplemental materials are available for this article. Go to the publishers online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file.