A series of metal complexes of Co(II), Cu(II), Zn(II) and Sn(II) having the general composition [ML] where L = Salicaldehydethiosemicarbazone M = Co(II), Cu(II), Zn(II) and Sn(II) have been prepared by electrochemical method and characterized by elemental chemical analysis, magnetic susceptibility measurements, thermal analysis, molar conductance, and spectral (IR, Raman,  electronic UV/Vis, IH-NMR, mass) The IR and Raman spectral data suggests the involvement of sulphur and azomethane nitrogen in coordination to the central metal ion. On the basis of spectral studies, a octahedral geometry has been assigned for Co(II), Cu(II), and tetrahedral geometry has been assigned for Zn(II), Sn(II) complexes. The IR spectra show that the Salicaldehydethiosemicarbazone free ligand is coordinated to the metal(II) as a neutral bidentate ligand through both of the lone pair of electrons of the C=O carbonyl group, C=N azomethine group and C=S group. The differential thermogravimetric analysis (DTG) curves were used to study the decomposition steps of the isolated complexes using Horowitz-Metzger (HM) and Coats-Redfern (CR) methods.