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Portraying the Role of Halo Ligands and Auxiliary Part of Ligands of Mononuclear Manganese(III)-Schiff Base Complexes on Catalyzing Phospho-ester Bond Hydrolysis

Abstract

Four mononucleating Schiff base ligand namely HL1, HL2, HL3 and HL4 were prepared via condensation between 2-hydroxybenzaldehyde and 2- morpholino ethanamine, 2-(piperazin-1-yl)ethanamine, 2-(piperidin-1-yl)ethanamine and 2-(pyrrolidin-1-yl)ethanamine in the respective manner. Seven mononuclear manganese (III) complexes were prepared from four ligands. Complexes 1-3 were prepared from ligand HL1 by using chloride, bromide and iodide salts of manganese (II) respectively. On the other hand complexes 4, 5, 6 and 7 were prepared by reaction of manganese chloride followed by sodium thiocyanate with ligands HL2, HL3, HL4, and HL1 respectively. All the complexes are characterized by usual physicochemical techniques and their solid state structures were obtained from single crystal X-Ray analysis. The phosphatase like activity of these complexes was studied in 97.5 %( v/v) N, N-dimethylformamide-water mixture using disodium salt of 4-nitrophenylphosphate (4-NPP) as the model substrate to evaluate the role of halo-anions and auxiliary part of ligand backbone towards phosphatase like activity. Detailed experimental findings prove that complex 2 is the highest active catalyst among all seven complexes and the complex bearing the morpholine ring is the highest active catalyst among the complexes 4-7.

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Publication details

The article was received on 28 May 2018, accepted on 26 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02634C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Portraying the Role of Halo Ligands and Auxiliary Part of Ligands of Mononuclear Manganese(III)-Schiff Base Complexes on Catalyzing Phospho-ester Bond Hydrolysis

    D. Das, T. Chakraborty, S. Dasgupta and E. Zangrando, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02634C

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