catena-Poly[[tetrakis(μ-3,3-dimethylbutyrato-O:O′)dicopper(II)]-μ-3,3-di­methylbutyrato-O:O′-[bis(2,6-di­methylpyridine-N)copper(II)]-μ-3,3-di­methylbutyrato-O:O′] and tetrakis(μ-2,2-dimethylpropanoato-O:O′)bis[(2,6-dimethylpyridine-N)copper(II)]

The two title compounds, [Cu3(C6H11O2)6(C7H9N)2]n, (I), and [Cu2(C5H9O2)4(C7H9N)2], (II), have chain and finite‐molecular structures, respectively. In (I), binuclear cage units and mononuclear 2,6‐di­methyl­pyridine complexes, both of which have inversion centres, are arranged alternately and are linked by the carboxyl­ate ions to form one‐dimensional chains along the a axis. In (II), the binuclear cage unit has an inversion centre and the coordination geometry around the Cu atom is typical square pyramidal, with 2,6‐di­methyl­pyridine at the apical position.