Über Oxocuprate, XX Ein Erdalkalioxocuprat(II) mit geschlossenen Baugruppen: BaCuO2 / About Oxocuprates, XX Alkaline-earth Oxocuprate(II) with Closed Structural Groups : BaCuO2

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Abstract
The new alkaline-earth oxocuprate(II) BaCuO2 was prepared and investigated by single crystal X-ray methods. (Space group : Oh 9-Im 3 m, lattice constant: a = 1827 pm.) The distribution of 360 atoms per unit cell leads to a complicated polyhedral framework with Cu2+ in well known square coordination. One of the Ba2+ positions has the extraordinary coordination number 24.