Abstract: The use of acid amide as ligand for obtaining platinum blue has been investigated. While blue compounds are generally obtained by using the hydrolysis product of cis- dichlorodiammineplatinum (I1) as platinum source, with such ligands the reaction occurs very readily using potassium tetrachloroplatinate (I1). The role of the carboxylic function which offers here a primary ligating site to platinum is evidenced. The compounds ...