Three heterometallic complexes [M (H2O) n][Cu3L2 (H2O)](M= Mn2+, Co2+ or Ba2+) and one dinuclear compound (CuDien)(CuL {H2O}) were prepared by interaction of anionic compounds Cu3L22− or CuL2− with the corresponding cations (H4L= 1, 9-dicyano-1, 9-bis (hydroximino)-3, 7-diazanonane-2, 8-dione; Dien= 1, 5-diamino-3-azapentane). The complexes [M (H2O) n][Cu3L2 (H2O)] have a polymeric structure, formed via ...