Journal of Thermal Analysis and Calorimetry

, Volume 127, Issue 1, pp 731–741 | Cite as

Thermal behavior of new nickel(II) complexes with unsaturated carboxylates and heterocyclic N-donor ligands

  • Rodica Olar
  • Ioana Dorina Vlaicu
  • Mariana Carmen Chifiriuc
  • Coralia Bleotu
  • Nicolae Stănică
  • Gina Vasile Scăeţeanu
  • Luigi Silvestro
  • Constanţa Dulea
  • Mihaela Badea
Article

Abstract

Synthesis and characterization of four new Ni(II) complexes with mixed ligands have been reported in the present paper. As interest ligands, acrylate (acr) ion together with one N-donor heterocyclic ligand, namely benzimidazole (HBzIm), 2-methylbenzimidazole (2-MeBzIm), 5-methylbenzimidazole (5-MeBzIm) or 5,6-dimethylbenzimidazole (5,6-Me2BzIm), was chosen. The syntheses afforded the complexes formulated as [Ni(HBzIm)2(acr)2(H2O)]·3H2O (1), [Ni(2-MeBzIm)2(acr)2(H2O)]·1.5H2O (2), [Ni(5-MeBzIm)2(acr)2(H2O)] (3) and [Ni(5,6-Me2BzIm)2(acr)2] (4). Complexes (1) and (2) contain crystallization water molecules and coordinated water molecules, both their nature and presence being confirmed on the basis of IR spectra and thermal analysis. In contrast to above-mentioned complexes, (3) contains only coordinated water molecule, while (4) is an anhydrous compound. Based on electronic spectra and magnetic measurements, a distorted octahedral stereochemistry was proposed for all Ni(II) complexes. Acrylate ions act both as unidentate and chelate ligands in complexes (1)(3), while in complex (4) act only as chelate ligands. All used N-donor ligands function as monodentate in all Ni(II) complexes. Biological properties of complexes (1)(4) were evaluated against several Gram(+), Gram(−) bacterial strains and against fungus Candida albicans.

Keywords

Nickel complexes Thermal analysis Acrylate Benzimidazole Antimicrobial activity 

Supplementary material

10973_2016_5445_MOESM1_ESM.pdf (487 kb)
Supplementary material 1 (PDF 487 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2016

Authors and Affiliations

  • Rodica Olar
    • 1
  • Ioana Dorina Vlaicu
    • 1
    • 2
  • Mariana Carmen Chifiriuc
    • 3
  • Coralia Bleotu
    • 4
  • Nicolae Stănică
    • 5
  • Gina Vasile Scăeţeanu
    • 6
  • Luigi Silvestro
    • 7
  • Constanţa Dulea
    • 8
  • Mihaela Badea
    • 1
  1. 1.Department of Inorganic Chemistry, Faculty of ChemistryUniversity of BucharestBucharestRomania
  2. 2.National Institute of Materials PhysicsIlfovRomania
  3. 3.Department of Microbiology, Faculty of BiologyUniversity of BucharestBucharestRomania
  4. 4.Stefan S Nicolau Institute of VirologyBucharestRomania
  5. 5.Romanian Academy, “Ilie Murgulescu” Physical Chemistry InstituteBucharestRomania
  6. 6.Department of Soil SciencesUniversity of Agronomical Sciences and Veterinary MedicineBucharestRomania
  7. 7.3S-Pharmacological Consultation and Research GmbHHarpstedtGermany
  8. 8.Pharma Serv. International SRLBucharestRomania

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