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The two structures are built of  ∞  2 [MT Urea ], M = Pb, Ba, layers with cornerlinked ReO 4  tetrahedra (T) and O-coordinated urea bridges between the cations. The layers are decorated on both sides by half of the ReO 4  groups and water or urea molecules. An extensive network of hydrogen bonds and one long coordinative M–O bond in Pb(ReO 4 ) 2  · Urea · H 2 O holds the layers together. The cations have 4-capped square antiprismatic MO 9  coordination and the polyhedra form centrosymmetric dimers by sharing an edge of urea O atoms.

Structures of molecular adducts of inorganic salts. I. Pb(ReO 4 ) 2 · Urea · H 2 O and Ba(ReO 4 ) 2 · 3 Urea