pH-metric and electronic spectral studies on Schiff base complex formation with some 3d-metal ions

Department of Chemistry, Manonmaniam Sundaranar University, Abisekapatti, Tirunelveli-627 012, India

E-mail : msunet@md2vsnl-net-in   Fax : 91-0462-322973

Department of Chemistry, St. John's College, Tirunelveli-627 002, India

Manuscript received 17 July 2000, revised 19 October 2000, accepted 16 December 2000

Equilibrium-based computer models on eight Schiff base complex systems, viz. Co^II/ Ni^II/Cu^II/Zn^II-2-pyridinecarboxaldehyde (A)- L-threonine(thr) and L-glutamine(gln) (B) systems demonstrate the formation of Schiff base complexes of stoichiometry MAB, MA₂B and MA₂B₂. The Schiff base (AB) binds the metal ion in a tridentate manner. Tetrahedral geometry for CoAB and NiAB, square-planar geometry for CuAB and octahedral geometry for M(AB)₂ complexes are indicated.