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E-Journal of Chemistry
Volume 8, Issue 4, Pages 1864-1871
http://dx.doi.org/10.1155/2011/582649

Solvent Extraction Studies on Copper(II) and Silver(I) Complexes of Bis(4-hydroxypent-2-ylidene)diaminoethane: Composition of Extracted Copper(II) Species

P. O. Ukoha,1 F. I. Nwabue,2 and L. N. Obasi1

1Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria
2Department of Industrial Chemistry, Ebonyi State University, Abakaliki, Ebonyi State, Nigeria

Received 27 April 2010; Revised 7 November 2010; Accepted 18 November 2010

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Copper(II) complexes of bis(4-hydroxypent-2-ylidene)diaminoethane (BHPDE) were prepared by extractive method. Job’s continuous variation and equilibrium constant methods, as well as spectral and elemental analyses were applied in the determination of the nature of extracted species. The results indicate the formation of mixed ionic complexes of the types Cu(H2L)X2, Cu(H2L)2X2 and CuL (where H2L = BHPDE and X = NO3-, CIO4-, Cl- or ½SO42-). Cu(H2L)X2 and Cu(H2L)2X2 predominate at low pH extractions while CuL chelate predominates at high pH extraction. The complexes exist in two isomeric forms, the blue readily-water-soluble and the violet less water-soluble forms. Both complexes show maximum absorption at 540 nm and molar absorptivity values of about 2.0 x 102 dm3 mole-1 cm-1.