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Paper Details

Effect of pH on the formation of complex compounds with Schiff bases derived from 3-aldehydosalicylic acid with 7-amino-4-methyl coumarin

Basavaraj M. Kalshetty1*, S.S.Suvarnakhandi1, R.C.Sheth1 and M.B.Kalashetti 2

Journal Title:Journal of Chemical, Biological and physical sciences

The complex compounds of metal ions like Cu (II), Ni (II), Co (II), Cd (II), with the Schiff base ligand LH2 have been synthesized at different pH ranges. The synthesized complex compounds have been characterized on the basis of elemental analysis, molar mass and IR spectral studies. Hence, the study reveals that the ligand LH2 (Scheme 1) behaves as a monobasic bidentate ON donor where the two structures suggest the non-involvement of carboxylic oxygen atom in coordination at pH= 3-4. The ligand LH2 behaves as dibasic tridentate OON donor, suggesting the non-involvement of carbonyl oxygen atom of coumarin in the complex compounds at pH= 7. The ligand LH2 behaves as a dibasic tetra dentate OONO donor at pH=8, suggesting the coordination of coumarin carbonyl oxygen atom to the metal ions in the complex compounds.