Citation: WANG Xiao-Shan, LIU Li-Juan, XIA Ming-Jun, WANG Xiao-Yang, CHEN Chuang-Tian. Two Isostructural Multi-metal Borates: Syntheses, Crystal Structures and Characterizations of M₃LiNa₄Be₄B₁₀O₂₄F (M=Sr, Cd)[J]. Chinese Journal of Structural Chemistry, ;2016, 34(10): 1617-1625. doi: 10.14102/j.cnki.0254-5861.2011-0713 shu

Two Isostructural Multi-metal Borates: Syntheses, Crystal Structures and Characterizations of M₃LiNa₄Be₄B₁₀O₂₄F (M=Sr, Cd)

1.
a Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2.
b Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: LIU Li-Juan,
Received Date: 16 March 2015
Available Online: 13 May 2015
Fund Project: This work was supported by the National Natural Science Foundation of China (No.50972149, 61138004, 51402316) (No.50972149, 61138004, 51402316)

Two new isostructural multi-metal beryllium borates, M₃LiNa₄Be₄B₁₀O₂₄F (M=Sr (1), Cd (2)), have been synthesized by spontaneous crystallization. The structures were verified by single-crystal X-ray crystallography. The compounds crystallize in the trigonal space group R3, with a=b=9.4645(1) Å, c=38.842(8) Å, V=3013.2(6) Å³, Z=6, F(000)=2568, D_c=3.005 g/cm³, M_r=908.9, R=0.0327, wR=0.0678, μ=8.160 mm^-1 for Sr₃LiNa₄Be₄B₁₀O₂₄F and a=b=9.3019(8) Å, c=37.782(7) Å, V=2831.12(9) Å³, Z=6, F(000)=2748, D_c=3.459 g/cm³, M_r=983.24, R=0.0158, wR=0.0455, μ=3.586 mm^-1 for Cd₃LiNa₄Be₄B₁₀O₂₄F. The structures are characterized by an infinite two-dimensional [Be₈B₁₆O₄₀F₂]_∞ double layer bridged by [B₁₂O₂₄] groups like a sandwich structure, while the cations reside in tunnels along different directions. UV-vis-IR diffuse reflectance spectroscopy demonstrates that their cut-off edges are below 200 nm. Thermal analysis shows that they melt incongruently and their melting points are around 740~770 ℃.
- borates,
- [B₁₂O₂₄] group,
- optical material,
- sandwich structure,
- multi-metal;
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