o-hydroxyaroyl-isonicotinoyl hydrazones as chelating agents with divalent transition metal ions
✍ Scribed by Ramadan M. El-Bahnasawy; Somia E. El-Meleigy; Abd-Alla El-Tawansi
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 395 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0340-4285
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✦ Synopsis
Two series of bivalent metal complexes of the type M(Sal). xH20 and M(Naph) have been synthesized; where M = Co, Ni, Cu, Zn, Pd and Cd, and H/-Sal and H2-Naph are salicylaldehyde and o-hydroxynaphthaldehyde isonicotinoyl hydrazones which acted as dibasic terdentate ligands. The polymeric nature and coordination sites of the complexes have been characterized by elemental, d.t.a. and t.g.a analyses, molar conductance, pH, room temperature magnetic susceptibility and spectral (i.r., 1H n.m.r, u.v.) measurements. The protonation constants of the ligands have been determined potentiometrically at different temperatures, ionic strengths and at different EtOH-H20 compositions.