A study on some complexes of Schiff base (MNSB) prepared from 2-hydroxynapthaldehyde and mesalamine (5-amino-salicylic acid) is presented here. The metal ions used for the complexation are Co (II), Ni (II), Cu (II), Mn (II), Zn (II) and Cd (II). The characterization of these complexes is attempted using various traditional tools like physical properties, elemental analysis, metal estimation and percentage yield. The modern techniques like magnetic measurements, infrared spectroscopy, UV and visible spectroscopy and thermo gravimetric analysis have also been applied to deduce the structure and bonding in these complexes. Using all the above data, an octahedral geometry for the complexes is proposed. While the tetra dentate Schiff base uses its four coordinating atoms (3 O's and 1 N) for bonding, the remaining two positions are occupied by aquo ligands.