A new binucleating macrocycle incorporating four exocyclic oxime groups, 6,6'-methylene-bis[1,12-di(hydroximino)-2,3;9,10-dibenzo-1,11 -diaza-4,8-dithiacyclo- tridecane] (LH4) has been synthesized, its mononuclear Co-III and hetropolynuclear Co-III-Pd-II complexes have been prepared. LH4 and its metal complexes have been characterized by elemental analysis, H-1- and C-13-n.m.r., i.r. and mass spectral studies. The elemental analysis, stoichiometry and the spectroscopic data of the mononuclear Co-III complex indicate that the Co-III ions are coordinated by the oxime nitrogen atoms (C=N); Pd-II ions in the latter complex are coordinated through diaza-dithia moiety on the macrocycle. The mononuclear Co-III complex of LH4 has a 1:1 metal:ligand ratio. All spectral data support the proposed structure of LH4 and its complexes.