Complexation in the ternary Cu(II)-dithiooxamide-formaldehyde system at the gelatin-immobilized copper(II) hexacyanoferrate(II) matrices

Complexation in the gelatin-immobilized copper(II) hexacyanoferrate(II) mat rices contacting aqueous alkaline solutions (pH 12.0) containing dithiooxam ide H2N-C(S=)-C(=S)-NH2 and formaldehyde was studied. Under these condition s, the template synthesis yields a 1 : 1 Cu(II) complex with chelating 2,8- dithio-3,7-diaza-5-oxanonanedithioamide-1,9 ligand. In this complex, dithio oxamide and formaldehyde function as ligsons. The scheme is suggested for t he corresponding processes. Such a chelate compound cannot be prepared by t he direct reaction between the known Cu(II) dithiooxamide complexes and for maldehyde.