Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 3 (March 2004)


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Acta Cryst. (2004). C60, m129-m133    [doi:10.1107/S0108270104001945]

RbCrIII(C2O4)2·2H2O, Cs2Mg(C2O4)2·4H2O and Rb2CuII(C2O4)2·2H2O: three new complex oxalate hydrates

U. Kolitsch

Abstract: Rubidium chromium(III) dioxalate dihydrate [diaquabis([bold mu]-oxalato)chromium(III)rubidium(I)], [RbCr(C2O4)2(H2O)2], (I), and dicaesium magnesium dioxalate tetrahydrate [tetraaquabis([bold mu]-oxalato)magnesium(II)dicaesium(I)], [Cs2Mg(C2O4)2(H2O)4], (II), have layered structures which are new among double-metal oxalates. In (I), the Rb and Cr atoms lie on sites with imposed 2/m symmetry and the unique water molecule lies on a mirror plane; in (II), the Mg atom lies on a twofold axis. The two non-equivalent Cr and Mg atoms both show octahedral coordination, with a mean Cr-O distance of 1.966  Å and a mean Mg-O distance of 2.066  Å. Dirubidium copper(II) dioxalate dihydrate [diaquabis([bold mu]-oxalato)copper(II)dirubidium(I)], [Rb2Cu(C2O4)2(H2O)2], (III), is also layered and is isotypic with the previously described K2- and (NH4)2CuII(C2O4)2·2H2O compounds. The two non-equivalent Cu atoms lie on inversion centres and are both (4+2)-coordinated. Hydrogen bonds are medium-strong to weak in the three compounds. The oxalate groups are slightly non-planar only in the Cs-Mg compound, (II), and are more distinctly non-planar in the K-Cu compound, (III).

Formula: [RbCr(C2O4)2(H2O)2], [Cs2Mg(C2O4)2(H2O)4] and [Rb2Cu(C2O4)2(H2O)2]

Online 19 February 2004

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