Oxamidato complexes. 5. Influence of the steric constraints on the complex formation between copper(II) and N,N'-(alkyl-substituted)oxamides. Synthesis and crystal structure of [Cu2(mapox)(N3)2]n (H2mapox = N,N'-bis([3-(methylamino)propyl]oxamide)

Potentiometric studies on the ternary systems Cu 2+ -mapox 2- -H + and Cu 2+ -dmapox 2- -H + where mapox 2- and dmapox 2- are the dianions of N,N'-bis[3-(methylamino)propyl]oxamide and N,N'-bis[3-(dimethylamino)propyl]oxamide, respectively carried out at 25 o C and 0.1 mol dm -3 NaNO 3