Catena-Poly[[{bis[tetraaqua(2-hydroxy-3,4-dioxocyclobut-1-en-1-olato- κO 1)bariumstrontium(0.35/0.65)]di-μ-aqua}-bis(μ-2- hydroxy-4-oxocyclobut-1-ene-1,3-diolato-κ2O1:O 3)] monohydrate]

Abstract

The title structure, {[Ba0.71Sr1.29(C 4HO4)4(H2O)10] ·H2O}n, is built from dimers of edge-sharing monocapped square anti-prisms [(Ba/Sr)O3(H2O) 6], in which barium and strontium are statistically disordered [ratio 0.353 (8):0.647 (8)] on the same crystallographic site. Such dimers are connected via bidentate hydrogen squarate groups [HC4O 4]-, leading to chains that propagate along the b axis. Inter-and intramolecular O -H⋯O hydrogen bonds maintain the crystal packing through a three-dimensional network.