Journal of Thermal Analysis and Calorimetry

, Volume 81, Issue 2, pp 339–346 | Cite as

Structural and thermal studies of some aroylhydrazone Schiff’s bases-transition metal complexes

  • H. A. El-Boraey


Cobalt(II), nickel(II) and copper(II) complexes of some aroylhydrazone Schiff’s bases derived from isoniazide (hydrazide of isonicotinic acid) with p-hydroxybenzaldehyde; 2,4-dihydroxybenzaldehyde or 2-hydroxy-1-naphthaldehyde are prepared and characterized. The study reveals that the ligands coordinate in the keto form. That transformed to the enol through the loss of HCl upon heating the solid complexes. The copper(II) complexes are thermochromic in the solid-state while the cobalt(II) complex, 3 of 2,4-dihydroxybenzaldehyde moiety is solvatochromic in hot DMF. The chromisms obtained were discussed in terms of change in the ligand field strength and/or coordination geometry.

thermal studies metal complexes aroylhydrazones electronic spectral data IR spectral data Schiff’s bases 


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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • H. A. El-Boraey
    • 1
  1. 1.Department of Chemistry, Faculty of Science, Menoufia University

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