A mixed ligand complex of some heterocycles of amines with tetrametylethylendiamin of platinum (III) with heterocyclic amines has first ever been synthesized. Composition and structure of synthesized complexes has been studied through present-day physical-chemical methods. It is apparent that in all cases heterocyclic amines correlate the central atom with nitrogen atom of the cycle in cis-position. Coordinating in cis-position, tetrametylethylendiamin forms metal-chelate cycles. Where as heterocyclic amines do not form individual complexes with “nikomorfolin” of platinum, they easily form mixed ligand complexes.