RbCrIII(C₂O₄)₂•2H₂O, Cs₂Mg(C₂O₄)_2•4H₂O and Rb₂Cu^II(C₂O₄)₂•2H₂O: Three new complex oxalate hydrates

Autor(en)

Uwe Kolitsch

Abstrakt

Rubidium chromium(III) dioxalate dihydrate [diaquabis(œ-oxalato)chromium(III)rubidium(I)], [RbCr(C2O4)2(H2 O)2], (I), and dicaesium magnesium dioxalate tetrahydrate [tetra-aquabis(œ-oxalato) magnesium(II)dicaesium(I)], [Cs2Mg(C2-O4)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 A° and mean Mg-O distance of 2.066 A°. Dirubidium copper(II) dioxalate dihydrate [diaquabis(œ-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)2ž2H2O 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).

Organisation(en)

Institut für Mineralogie und Kristallographie

Journal

Acta Crystallographica. Section C: Crystal Structure Communications

Band

60

Seiten

m129-m133

Anzahl der Seiten

5

ISSN

0108-2701

Publikationsdatum

2004

Peer-reviewed

Ja

ÖFOS 2012

1051 Geologie, Mineralogie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2a267733-a18d-45a0-a5be-052fad96c260