Über Oxostannate(II). V. Na4[SnO3] – das erste Oxostannat(II) mit „Inselstruktur”︁

On Oxostannates(II). V. Na₄[SnO₃] – The First Oxostannate (II) with Island Structure The new oxid Na₄SnO₃ (yellow, transparant single crystals) has been prepared by heating of mixtures of: 1. NaO_0.45 and SnO (Na:Sn²⁺ = 4.1:1; Ag-cylinders; 600–730°C, 7–66 d); 2. NaO_0.45′ SnO₂ and Sn^±0 (Na:Sn⁴⁺:Sn^±0 = 8.2:1:1; Ag-cylinders; 650–680°C, 2–66 d); 3. NaO_0.45′ Na₂SnO₃ and Sn^±0 (Na:Na₂SnO₃:Sn^±0 = 6.1:1:1; Ag-cylinders; 650–670°C, 5 d). Na₄SnO₃:804 I₀(hkl); four circle diffractometer PW 1100; ω-scan; MoKα; R = 5.14%; R_w = 4.64%; monoclin, Cc? C; a = 582.77(11), b = 1667.44(24), c = 589.42(10) pm, β = 110.187(13)°; d_x = 3.20 g/cm³; d_pyk = 3.19 g/cm³; Z = 4; parameter look for text. It is a NaCl-variant with systemathical blanks of the anion part and “isolated” groups of [SnO₃]. documentclass{article}pagestyle{empty}begin{document}$ {rm N}mathop {rm a}limits^{rm 1} $end{document} has the uncommon coordination number 2. The Effective Coordination Numbers, ECoN, the Mean Fictive Ionic Radii, MEFIR, and the Madelung Part of Lattice Energy, MAPLE, are calculated. The structure is described using ?Erweiterte Schlegeldiagramme”?.