N,N′-Disubstituted dithiooxamide-Cu(II) as compound semiconductors prepared by the usual method have been liable to be an isomeric mixture of coordination polymers. Syntheses of the stereospecific coordination polymers were attempted by an interfacial technique. The dithiooxamides with two hydrophobic substituents, R’s, on nitrogen atoms of a ligand molecule could be spread on a water surface to form the monomolecular film, where its possible structure is cis isomers of the ligands. Some coordination compounds, i.e. the stereospecific coordination polymers, between the cis isomers and Cu2+ ions were found to be produced at the air-water interface by employing the substrate solution containing Cu2+ ions. This was established by the surface pressure vs. area measurements for their ligand molecules with C6H5CH2–, C6H11–, C12H25–, and C12H25OCOCH2– as hydrophobic substituents, and by the effects of various spreading solvents, pH in substrate solutions and temperatures on their monolayers. Furthermore, built-up films of these polymers were examined for thickness.

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