Can I read Mixed alkali systems: Dietzels theorem, X-ray structure, hygroscopicity, and 29-Si MAS NMR of NaRbSi~2~O~5~ and NaCsSi~2~O~5~ on EtoBox?

Mixed alkali systems: Dietzels theorem, X-ray structure, hygroscopicity, and 29-Si MAS NMR of NaRbSi~2~O~5~ and NaCsSi~2~O~5~ by B.H.W.W.S. de Jong; H.T.J. Supèr; R.M. Frijhoff; A.L. Spek; G. Nachtegaal is a Chemistry article available to read on EtoBox.

What is Mixed alkali systems: Dietzels theorem, X-ray structure, hygroscopicity, and 29-Si MAS NMR of NaRbSi~2~O~5~ and NaCsSi~2~O~5~ about?

NaRbSi~2~O~5~, M~r~ 244.63, λ(MoK~α~)=0.71073 Å, 150K, monoclinic, P2~1~/c, a=4.8570(10)°, b=13.5403(10)°, c=7.7328(10) Å, β=90.908(10)°, V=508.49(13) Å^3^, μ(MoK~α~)=10.23 mm^-1^, Z=4, F(000)=464, D~x~=3.1954(8) g/cm^3^, R~1~=0.0899 for 743 reflections with I>2.0σ(I), wR~2~=0.2425 for all 2534 reflections. NaCsSi~2~O~5~, M~r~ 584.13, λ(MoK~α~)=0.71073 Å, 150K, orthorhombic, Pna2~1~, a=17.0743(10)°, b=4.9011(10)°, c=13.3391(10) Å, V=1116.3(3) Å^3^, μ(MoK~α~)=7.08 mm^-1^, Z=8, F(000)=1072, D~x~=3.4757(9)g/cm^3^, R~1~=0.0199 for 1103 reflections with I>2.0σ(I), wR~2~=0.0465 for all 2668 reflections. The crystal structures of NaRbSi~2~O~5~ and NaCsSi~2~O~5~ have been determined. Though the nominal composition of both phases is that of a phyllosilicate, their anion topology is similar and consists of double chains of [SiO~4~] tetrahedra forming 4-membered T rings, i.e. rings consisting of 4 tetrahedra in chair conformation and built from Q~3~ units. The alkali-oxygen distances in the Na~2~O-Cs~2~O-SiO~2~ system tend to support the notion that in mixed alkali systems the alkali-oxygen distance of the smaller cation decreases at the expense of that of the larger one. The observed very hi

Who reads Mixed alkali systems: Dietzels theorem, X-ray structure, hygroscopicity, and 29-Si MAS NMR of NaRbSi~2~O~5~ and NaCsSi~2~O~5~?

Author

B.H.W.W.S. de Jong; H.T.J. Supèr; R.M. Frijhoff; A.L. Spek; G. Nachtegaal

Publisher

Walter de Gruyter GmbH

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)