Supramolecular isomerism with polythreaded topology based on [Mo8O26]4- isomers.

Two compounds, namely, [Cu(bbi)](2)[Cu(2)(bbi)(2)(delta-Mo(8)O(26))0.5][alpha-Mo(8)O(26)]0.5 (1) and [Cu(bbi)][Cu(bbi)(theta-Mo(8)O(26))0.5] (2), where bbi is 1,1'-(1,4-butanediyl)bis(imidazole), were synthesized under hydrothermal conditions at different pH values. Their crystal structures were determined by X-ray diffraction. Compounds 1 and 2 are supramolecular isomers with a polythreaded topology based on octamolybdate building blocks.