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Mononuclear and binuclear chelates of biacetylmonoxime picolinoylhydrazone

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Abstract

Mononuclear and binuclear chelates of biacetylmonoxime picolinoylhydrazone (H2BMPcH) with CrIII, FeIII, CoII, NiII, CuII, ZnII, CdII, PdII and UO2 2+ have been prepared. Elemental analyses, molar conductivities, spectral (u.v., visible, i.r., n.m.r., e.s.r.), thermal (t.g., d.t.g., d.t.a.) and magnetic susceptibility measurements have been used to characterize the chelates. The i.r. spectral data indicate that H2BMPcH behaves in a bidentate, tridentate and/or tetradentate manner and the hydrazonic azomethine nitrogen constituents the chelating backbone in all chelates. Based on magnetic and spectroscopic data, the structures for the chelates are proposed as follows: tetrahedral for [Co(HBMPcH)(H2O)]Cl, octahedral for [Co(HBMPcH)2], [Cr(HBMPcH)Cl(H2O)]2Cl2, [Fe(HBMPcH)Cl-(H2O)]2Cl2, [Ni(BMPcH)(H2O)2], square-planar for (Ni(HBMPcH)Cl], [Pd(HBMPcH)Cl], [Cu(HBMPcH)(H2O)]Cl and tetragonally distorted octahedral for [Cu(BMPcH)(H2O)2]2 chelates. Generally, the solid metal acetate complexes have a unique decomposition exotherm profile which can be used as a rapid and sensitive tool for the detection of acetate-containing complexes.

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  1. Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt

    Tawfik H. Rakha

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Rakha, T.H. Mononuclear and binuclear chelates of biacetylmonoxime picolinoylhydrazone. Transition Metal Chemistry 24, 659–665 (1999). https://doi.org/10.1023/A:1006936101143

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