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Colourless single crystals of BaC4O4 have been obtained from aqueous solution at 80 °C. BaC4O4 is stable in air up to 490°C. BaCO3 is formed by further increase of temperature. BaC4O4 crystallizes in the tetragonal space group I4/mcm (nr. 140) with a=635.95(5), c=1240.77(13) pm, Z=4. Ba2+ is coordinated by eight oxygen atoms of the squarate dianions; Ba-O 276.1(1)pm. The coordination polyhedron is a distorted, square anti-prism. The squarate dianions occupy crystallographic mirror planes and posses approximately 4/mmm symmetry; C-C 145.7(5) and 146.5(5) pm, C-O 125.9(3) pm. A layer-like separation between the cations and anions exists with respect to the [001] direction.
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This page is a summary of: BaC4O44 — Ein kristallwasserfreies Erdalkaliquadratat mit dreidimensionaler Gerüststruktur und schichtartiger Trennung von Kationen und Anionen, Zeitschrift für anorganische und allgemeine Chemie, March 2003, Wiley,
DOI: 10.1002/zaac.200390061.
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