The seventh type of Wells–Dawson isomer, δ-[(WO5)W17Cu(H2O)O55]10− (1a) was obtained as a consequence of the formation of the first central square-pyramidal [WO5] moiety that results in a 45° rotation of the four belt [CuO5]/[WO5] square pyramids, establishing a new type of WD isomerism involving the rotation of the belt polyhedra, that were previously believed to stay unchanged.
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