Complexing between copper(II) and bulky substituted 3-benzoyl thioureas incopper(II) hexacyanoferrate(II) gelatin-immobilized matrix systems

A novel route to complexes of Cu-II with various bulky substituted 3-benzoy lthioureas: [(1-(2-hydroxy)phenyl-, 1-(4-hydroxy)phenyl-, 1,1-dibenzyl-, 1- methyl-1-phenyl-, 1-N-pentamethylene-] and 1-N-3-oxatetramethylene-3-benzoy lthiourea, complexed to a Cu-II hexacyanoferrate(II) gelatin-immobilized ma trix in contact with aqueous alkali (pH 12.0) solutions of the ligands indi cated, has been developed. Under the conditions specified, coordination of each ligand is preceded by decomposition of Cu-II-hexacyanoferrate(II) to g ive polymeric copper(II) hydroxide under the influence of OH- ions. With Cu -II-1-(4-hydroxy)phenyl-3-benzoylthiourea, three different water-insoluble coordination compounds are formed; in the other Cu-II-ligand systems, two t ypes of complexes are formed, whereas complexing in solution or solid phase in these systems results, as a rule, in the formation of only one coordina tion compound. In systems such as Cu-II-1-naphthyl-3-benzoplthiourea; Cu-II -1-(4-hydroxy-3,5-di-t-butyl)benzyl-3-benzoylthiourea and Cu-II-1-(4-hydrox y-3,5-di-t-butyl) phenethyl-3-benzoylthiourea, complexing in Cu-II hexacyan oferrate(II) gelatin-immobilized matrices (GIM) is not observed.