Articles written in Journal of Chemical Sciences

    • Mn(II) complexes with bipyridine, phenanthroline and benzoic acid: Biological and catalase-like activity


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      Five mononuclear Mn(II) complexes, [Mn(phen)²(ClO´)²] (1), [Mn(phen)³](ClO´)²(H²CO³)²(2),

      [Mn(bipy)²(ClO´)²] (3), [Mn(bipy)³](ClO´)²) (4), and Mn(phen)²(ba)(H²O)](ClO´)(CH³OH) (5), where bipy

      = 2,2’-bipyridine, phen = 1,10-phenanthroline, and ba = benzoic acid were prepared and characterized by Xray,IR and UV-Vis spectroscopies, and their catalase-like and biological activities were studied. The presenceof two different types and the number of chelating NN-donor neutral ligands allowed for analysis of theireffects on the catalase and biological activities. It was observed that the presence and number of phen ligandsimproved the activity more than the bipy ligand. Complexes 1 and 2, which contain more basic phen ligands,disproportionate H²O² faster than complexes 3 and 4, which contain less basic bipy ligands. The in vitroantimicrobial activities of all the complexes were also tested against seven bacterial strains by microdilutiontests. All the bacterial isolates demonstrated sensitivity to the complexes and the antifungal (anticandidal)activities of the Mn(II) complexes were remarkably higher than the reference drug ketoconazole

    • Homogeneous oxidation of alcohol and alkene with copper (II) complex in water


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      A new water-soluble copper(II) complex bearing 4-bromobenzoate/2,2'-dipyridylamine ligands was successfully synthesized and characterized by using single crystal X-ray diffraction and spectroscopic techniques. The catalytic activity of the compound was investigated as a homogeneous catalyst in the oxidationof several alcohols (benzyl alcohol, cinnamyl alcohol, 1-phenylethanol, cyclohexanol, 1-heptanol) and alkenes (styrene, ethylbenzene, cyclohexene) in aqueous medium. The copper(II) catalyst was found to be active for the studied alcohols and alkenes. H2O2 was used as an active oxidant for alcohol oxidation, while t-BuOOH (TBHP)was used for alkenes. The compound exhibited high selectivity toward benzaldehyde (88%) in cinnamyl alcohol oxidation under mild conditions (70 °C) after 4 h. Particularly, remarkable results were obtained forthe oxidation of styrene and cyclohexene; transformation via allylic oxidation to 2-cyclohexene-1-one as one product in 2 h (TOF = 50 h−1) and benzaldehyde in 1 h (100% conversion, TOF = 86 h−1, 100% selectivity). The Cu(II)/TBHP (or H2O2)/H2O system proved to be an alternative for catalytic oxidations in the green chemistry concept.

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