Structural, thermal and electrical properties of some new polychelates with bis-(mercaptoacetamido)-1,5-diaminonaphthalene

Polychelates of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) formed wi th bis-(mercaptocetamido)-1,5-diaminonaphthaiene (BMADN) have been prepared and characterized by elemental analysis, magnetic, spectral, and thermal p roperties. Electrical conductivities of the chelates have been studied too. The thermodynamic parameters and the order of reactions were calculated fr om the TG data. Elemental analysis indicates a 1:1 (metal:ligand) stoichiom etry. All the chelates were found to be insoluble in water and common organ ic solvents. Polychelates of Mn(II), Co(II) and Ni(II) are six coordinated octahedral, Cu(II) is planar, while the ones of Zn(II) and Cd(II) are four coordinated tetrahedral.