The crystal structures of solvent-free alkali-metal squarates from powder diffraction data
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Robert E. Dinnebier
Abstract
The crystal structures of solvent-free lithium, sodium, rubidium, and cesium squarates have been determined from high resolution synchrotron and X-ray laboratory powder patterns. Crystallographic data at room temperature of Li2C4O4: a = 7.1073(3) Å, b = 9.5627(4) Å, c = 3.2973(1) Å, β = 101.11(1)°, V = 219.91(1) Å3, monoclinic, C2/m, Z = 2, Na2C4O4: a = 3.4925(1) Å, b = 6.8152(1) Å, c = 10.3525(2) Å, β = 91.56(1)° V = 246.32(1) Å3, monoclinic, P21/c, Z = 2; Rb2C4O4: a = 10.7908(5) Å, b = 6.8494(3) Å, c = 4.4521(2) Å, β = 92.39(0), V = 328.77(4) Å3, monoclinic, C2/m, Z = 2; Cs2C4O4: a = 11.1768(3) Å, b = 7.0453(2) Å, c = 4.7424(1) Å, β = 92.89(1)°; V = 372.97(4) Å3, monoclinic, C2/m, Z = 2. The packing features of lithium squarate can be deduced from the AlB2 structure type, while sodium, rubidium, and cesium squarate are related to the CdI2 type. The relation between the two types of crystal structures of the squarate dianion is discussed.
© by Oldenbourg Wissenschaftsverlag, München
Artikel in diesem Heft
- Symmetries of coincidence site lattices of cubic lattices
- About the degree of hydration in potassiumtrisoxalatochromate hydrate
- Structural variations of Cr-doped (Y,REE)AlO3 perovskites
- Structure change of Mn2O3 under high pressure and pressure-induced transition
- To crystal chemistry of compounds of MHgYX (M = Cu, Ag, Y = S, Se, X = Cl, Br, I)
- The crystal structures of solvent-free alkali-metal squarates from powder diffraction data
- PDF from X-ray powder diffraction for nanometer-scale atomic structure analysis of quasicrystalline alloys
- Cu2MnMIVS4 (MIV = Si, Ge, Sn) — analysis of crystal structures and tetrahedra volumes of normal tetrahedral compounds
- Synthesis and crystal structure of a homotrinuclear Ni(II) complex
- Two new mononuclear Ni(II) complexes with reduced ONNO type Schiff base
- The cubic limiting complexes of lattice complexes with trigonal characteristic symmetry
Artikel in diesem Heft
- Symmetries of coincidence site lattices of cubic lattices
- About the degree of hydration in potassiumtrisoxalatochromate hydrate
- Structural variations of Cr-doped (Y,REE)AlO3 perovskites
- Structure change of Mn2O3 under high pressure and pressure-induced transition
- To crystal chemistry of compounds of MHgYX (M = Cu, Ag, Y = S, Se, X = Cl, Br, I)
- The crystal structures of solvent-free alkali-metal squarates from powder diffraction data
- PDF from X-ray powder diffraction for nanometer-scale atomic structure analysis of quasicrystalline alloys
- Cu2MnMIVS4 (MIV = Si, Ge, Sn) — analysis of crystal structures and tetrahedra volumes of normal tetrahedral compounds
- Synthesis and crystal structure of a homotrinuclear Ni(II) complex
- Two new mononuclear Ni(II) complexes with reduced ONNO type Schiff base
- The cubic limiting complexes of lattice complexes with trigonal characteristic symmetry
