Unprecedented Dawson isomerism induced by a central [WO5] and four 45°-rotated belt square pyramids

Abstract

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.