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Novel synthesis of 2-imino-2H-chromene-3-carboximide metal complexes

Thermal decomposition, spectral studies and antimicrobial activity evaluation

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Abstract

New metal complexes derived from the reaction of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) chlorides with the 2-imino-2H-chromene-3-carboximide organic ligand (HL) have been synthesized. The resulting complexes have been characterized by elemental analysis (CHN), IR, magnetic susceptibility, mass spectra, 1HNMR, UV–Vis, ESR, thermal analysis (TG, DTG and DTA) and molar conductance measurements. All the complexes are 1:2 and 1:3 electrolytes according to their molar conductivities. The microanalyses and spectroscopic data showed that the metal(II)/(III) ions in these complexes achieved coordination number of six and hence have octahedral geometrical structures. This is attained by bonding to the bidentate ligand via its two amino nitrogen atoms and two imine nitrogen atoms, and two monodentate aquo groups via its oxygen atoms. The results showed that the ligand acts as neutral bidentate coordinating via amino and NH nitrogens without displacement of hydrogen. The antimicrobial activities of the chromene ligand and its complexes have been tested against a number of pathogenic bacteria and fungi to assess their inhibiting potential. Antimicrobial studies indicate that these complexes exhibit better activity than the chromene ligand.

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Acknowledgements

The authors wish to express their deep thank for Ms/Salma Ahmed for carrying out the biological activity study in this work.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Helwan University, P.O. Box 11795, Helwan, Egypt

    Madiha H. Soliman & Galal H. Elgemeie

  2. Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt

    Gehad G. Mohamed

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  1. Madiha H. Soliman
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Correspondence to Madiha H. Soliman.

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Soliman, M.H., Mohamed, G.G. & Elgemeie, G.H. Novel synthesis of 2-imino-2H-chromene-3-carboximide metal complexes. J Therm Anal Calorim 123, 583–594 (2016). https://doi.org/10.1007/s10973-015-4975-4

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