Two isomers of N-(2-pyridylmethyl)glycinatocobalt(III) complexes containing incomplete cubane Co3O4 cores, [Co-3(Pg)(3)(mu(3)-O)(mu-oH)(3)](+), were isolated and their structures were determined by the X-ray diffraction method. While the trinuclear structure of one of the two isomers was stabilized by three inter-ligand N-(HO)-O-... hydrogen bonds, that of the other was stabilized by two N-(HO)-O-... hydrogen bonds and one inter-ligand pyridyl-pyridyl stacking interaction.