Three new mono-di-trinuclear cobalt complexes of selectively and non-selectively condensed Schiff bases with N2O and N2O2 donor sets: Syntheses, structural variations, EPR and DNA binding studies

Aurkie Ray, Georgina M. Rosair, Ramakant Kadam, Samiran Mitra

Research output: Contribution to journalArticle

Abstract

Three new mono-di-trinuclear cobalt complexes of three different Schiff bases have been synthesised. In all the three complexes psuedohalides (NCO- and N3-) have been incorporated to generate structural variation. Of the three Schiff bases, HL1 and HL2 were obtained by selective condensation of two different 1,3-diamines with 2-hydroxyacetophenone and H2L3 resulted from non-selective condensation of 1,3-diamine with 2-hydroxyacetophenone. Only one -NH2 functionality of 1,3-diaminopropane and 1,3-diaminopentane was selectively condensed with 2-hydroxyacetophenone to generate Schiff bases HL1 and HL2, respectively. H2L3 was obtained by condensing both the amine functionality of 1,3-diaminopropane with 2-hydroxyacetophenone. Therefore HL1 and HL2 behave as a N2O donors, whereas H2L3 provides a N2O2 donor coordination environment for the cobalt ions in the respective complexes. In [Co(L1)2]2 [Co(NCO)4] (1) the asymmetric unit comprises of five mononuclear cobalt centers, [Co2(µ-N3)2(L2)2(N3)2] (2) is a dinuclear and [(H2O)2Co(µ-N3)2(µ-L3)2Co2(N3)1.25(CH3O)0.75] · H2O (3) is a trinuclear cobalt species. The three complexes have been characterised using IR, UV-Vis spectroscopy and cyclic voltammetry. Structural aspects of 1, 2 and 3 have been described by performing single crystal X-ray analysis. EPR analyses of 1 and 3, and DNA binding abilities of all three cobalt complexes have been studied in detail. © 2009 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)796-806
Number of pages11
JournalPolyhedron
Volume28
Issue number4
DOIs
Publication statusPublished - 12 Mar 2009

Keywords

  • Cobalt
  • Crystal structures
  • DNA binding
  • EPR
  • Mono-di-trinuclear
  • Selectively and non-selectively condensed Schiff bases

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