Transition Metal Chemistry

, Volume 38, Issue 7, pp 715–724 | Cite as

Synthetic aspects, crystal structures and antibacterial activities of manganese(III) and cobalt(III) complexes containing a tetradentate Schiff base

  • Michel Fleck
  • Manas Layek
  • Rajat Saha
  • Debasis Bandyopadhyay
Article
First Online:
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Accepted:

Abstract

Three new Schiff base complexes, namely [Mn(L)Cl] · H2O (1), [Co(L)Cl]2 · 2CH3COCH3 (2) and [Co(L)NCS]2 (3), where H2L = 2,2′-[propane-1,2-diylbis(nitriloeth-1-yl-1-ylidene)]diphenol, have been prepared and characterized. The syntheses of 1 and 2 have been achieved by reacting equimolar amounts of the respective metal chloride and the tetradentate Schiff base ligand (H2L). While the mononuclear Mn(III) complex 1 was obtained with MnCl2 in acetone medium, the same synthetic system yielded the binuclear Co(III) complex 2 in the presence of CoCl2. Dissolution of 1 and 2 followed by crystallization with ammonium thiocyanate in methanol yielded two isostructural phenoxo-bridged binuclear complexes, namely [Mn(L)NCS]2 (previously reported by us) and a new complex [Co(L)NCS]2 (3), respectively. All the complexes 1–3 have been characterized by microanalytical, spectroscopic, single crystal X-ray diffraction and other physicochemical studies. Structural studies reveal that 1 adopts a distorted tetragonal pyramidal geometry while 2 and 3 comprise dimeric Co(III) units with bridging phenolate oxygen atoms. All the complex units in 1–3 and the respective solvent molecules are held together by weak intermolecular H-bonding to constitute a supramolecular network in the solid state. The antibacterial activity of the complexes has been tested against some Gram(+) and Gram(−) bacteria.

Keywords

Schiff Base Gatifloxacin Schiff Base Ligand Schiff Base Complex Ammonium Thiocyanate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The authors (D. B. and M. L.) gratefully acknowledge the financial support under Minor Research Project No. PSW-002/12-13(ERO) from UGC, Eastern region, Kolkata, India.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Michel Fleck
    • 1
  • Manas Layek
    • 2
  • Rajat Saha
    • 3
  • Debasis Bandyopadhyay
    • 2
  1. 1.Institute of Mineralogy and CrystallographyUniversity of ViennaViennaAustria
  2. 2.Department of ChemistryBankura Christian CollegeBankuraIndia
  3. 3.Department of PhysicsJadavpur UniversityKolkataIndia

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