Synthesis, crystal structures and spectral characterization of trans-bisaquabis(o-vanillinato)copper(II), cis-aquabis (o-vanillinato)copper(II) and aqua[bis(o-vanillinato)-1,2-ethylenediimin]copper(II)

Odabasoglu M., Arslan F., Olmez H., Buyukgungor O.

DYES AND PIGMENTS, vol.75, no.3, pp.507-515, 2007 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 75 Issue: 3
  • Publication Date: 2007
  • Doi Number: 10.1016/j.dyepig.2006.06.033
  • Journal Name: DYES AND PIGMENTS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.507-515
  • Keywords: Schiff base complexes, o-vanillinato ligand, copper complexes, thermal decomposition, crystal structure, SCHIFF-BASE LIGANDS, COPPER(II) COMPLEXES, METAL-COMPLEXES, THIOSEMICARBAZONE, MANGANESE(II), CHROMIUM(III), NICKEL(II), COBALT(II), IRON(III)
  • Ondokuz Mayıs University Affiliated: No

Abstract

trans-Bisaquabis(o-vanillinato)copper-(II) (I), cis-aquabis(o-vanillinato)copper(II) (II) and aqua[bis(o-vanillinato)-1,2-ethylenediimin]copper(II) (III) complexes were synthesized and characterized by means of elemental analysis, IR and UV-vis spectroscopy, thermal analysis and X-ray diffraction techniques. The coordination geometry around Cu(II) is a octahedral with coordination number of six for I and is a square-pyramidal with coordination number of five for both II and III. In all three compounds, a three-dimensional structure is formed via C-H center dot center dot center dot O hydrogen-bond interactions and intermolecular pi-pi and pi-ring interactions. The compounds I and III have two-dimensional hydrogen-bonded step-chain structure in xz-plane, while compound II has a zigzag chain structure in xy-plane. On the basis of the first DTA(max) of the anhydrous complexes of I and II, the thermal stability sequence is trans-isomer > cis-isomer. This fact should be related with the binding of the ligand. (c) 2006 Elsevier Ltd. All rights reserved.