Determination Of Stability Constant Of Bivalent Transition Metal Complexes With Schiffs Base Ligands Derived From Methyl Furan With Hydroxy Naphthalene Amine

Research Article
Prem Mohan Mishra., Lalan Kumar Jha and Naresh Mohan Yadav
Substituted furan, Bivalent transition metals, Schiff’s base ligand, coordination compound, stability constant, IrvingRossoti technique modified by Calvin Bjerrum

In continuation of our previous work here also, we have been interested in studying the stability of complexes of bivalent transition metals with biologically active ligands. Here we are presenting determination of stability constant of complex compounds using ligands synthesised from 2-Methyl furan with 7- Hydroxy naphthalene 2-amine with bivalent transition metals. Schiff’s base ligands were synthesized by the condensation reaction of 2-Methyl furan with 7- hydroxy naphthalene-2-amine. Nitrate salts of divalent cobalt, nickel, copper and zinc were estimated by standard volumetric and gravimetric methods. Ligand was analysed for elements by reported methods. pH metric titrations were carried out in an inert atmosphere of nitrogen gas at constant ionic strength of 0.1M KNO3 with the help of digital pH meter and stability constant of complexes of these metals with the ligands synthesized were computed at 298K. temperature by Irving- Rossoti technique1 modified by Calvin Bjerrum2 The stability constant values of metals for the given ligand at the given temperature were found to be in the order Cu(II) > Ni(II), Co(II) > Zn (II). This result is in agreement with our previous studies and also the natural order proposed by Irving-William3