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Synthesis, spectroscopic characterization, and antimicrobial activity of cobalt(II) complexes of acetone-N(4)-phenylsemicarbazone: crystal structure of [Co(HL)2(MeOH)2](NO3)2

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Abstract

Four Co(II) complexes, [Co(HL)2](OAc)2, [Co(HL)2Cl2], [Co(HL)2(MeOH)2](NO3)2, and [Co2(HL)4(SO4)2] (HL = acetone-N(4)-phenylsemicarbazone) were synthesized and characterized by physicochemical and spectroscopic methods. The magnetic susceptibility measurements indicate that the complexes are paramagnetic with three unpaired electrons. In all the complexes, the semicarbazone is coordinated as a neutral bidentate ligand. The structure of [Co(HL)2(MeOH)2](NO3)2 was confirmed by single crystal X-ray crystallography. The ligand is neutral and bidentate, being coordinated to the cobalt atom through the carbonyl oxygen and the azomethine nitrogen. Intermolecular hydrogen bonding and C–H···π interactions combine to stabilize the crystal structure. The ligand and its two complexes [Co(HL)2Cl2] and [Co(HL)2(MeOH)2](NO3)2 were screened for their antibacterial and antifungal activities using disk diffusion methods.

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Acknowledgments

V. L. Siji is thankful to the Council of Scientific and Industrial Research, New Delhi, India, for financial support in the form of Junior Research Fellowship. The authors are thankful to Dr. M. R. P. Kurup, Department of Applied Chemistry, Cochin University of Science and Technology, for using the software DIAMOND version 3.1f. We are grateful to Dr. Babu Varghese, SAIF, IIT Chennai, India, for providing single-crystal XRD data. The authors are thankful to the SAIF, Cochin University of Science and Technology, Kochi, India, for elemental analyses, IR and electronic spectral data and IIT Roorkee, India, for magnetic susceptibility measurement.

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Authors and Affiliations

  1. Department of Chemistry, Mahatma Gandhi College, Thiruvananthapuram, Kerala, 695 004, India

    V. L. Siji & M. R. Sudarsanakumar

  2. Department of Chemistry, S.N. College, Varkala, Kerala, 695 145, India

    S. Suma

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  1. V. L. Siji
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  2. M. R. Sudarsanakumar
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  3. S. Suma
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Correspondence to M. R. Sudarsanakumar.

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Siji, V.L., Sudarsanakumar, M.R. & Suma, S. Synthesis, spectroscopic characterization, and antimicrobial activity of cobalt(II) complexes of acetone-N(4)-phenylsemicarbazone: crystal structure of [Co(HL)2(MeOH)2](NO3)2 . Transition Met Chem 36, 417–424 (2011). https://doi.org/10.1007/s11243-011-9485-z

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  • DOI: https://doi.org/10.1007/s11243-011-9485-z

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