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-dithiacyclotridecane] (LH4) has been synthesized, its mononuclear Co and hetropolynuclear Co-Pd complexes have been prepared. LH4 and its metal complexes have been characterized by elemental analysis, H- and C-n.m.r., i.r. and mass spectral studies. The elemental analysis, stoichiometry and the spectroscopic data of the mononuclear Co complex indicate that the Co ions are coordinated by the oxime nitrogen atoms (C = N); Pd ions in the latter complex are coordinated through diaza-dithia moiety on the macrocycle. The mononuclear Co complex of LH4 has a 1:1 metal:ligand ratio. All spectral data support the proposed structure of LH4 and its complexes.