Two Isostructural Multi-metal Borates: Syntheses, Crystal Structures and Characterizations of M_3LiN

• 作 者: 王小珊 刘丽娟 夏明军 王晓洋 陈创天
• 机 构: Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, C
• 出 处: 结构化学
• 发表日期: 2015年10期
• 关键词: reflectance melting sandwich crystallize verified diffuse bridged trigonal resid

Two new isostructural multi-metal beryllium borates, M3 Li Na4Be4B10O24F(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 R 3, with a = b = 9.4645(1) ?, c = 38.842(8) ?, V = 3013.2(6) ?3, Z = 6, F(000) = 2568, Dc = 3.005 g/cm3, Mr = 908.9, R = 0.0327, w R = 0.0678, μ = 8.160 mm-1 for Sr3 Li Na4Be4B10O24F and a = b = 9.3019(8) ?, c = 37.782(7) ?, V = 2831.12(9) ?3, Z = 6, F(000) = 2748, Dc = 3.459 g/cm3, Mr = 983.24, R = 0.0158, w R = 0.0455, μ = 3.586 mm-1 for Cd3 Li Na4Be4B10O24F. 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 ℃.

Two new isostructural multi-metal beryllium borates, M3 Li Na4Be4B10O24F (M = Sr (1), Cd (2)), have been synthesized by spontaneous crystallization. The structures were verified by single-crystal X-ray crystallography. The compound crystallize in the trigonal space group R 3 with a = b = 9.4645 (1) ?, c = 38.842 (8) ?, V = 3013.2 (6)? 3, Z = 6, F (000) = 2568, Dc = 3.005 g / cm3, Mr = 908.9, R = 0.0327, w R = 0.0678, μ = 8.160 mm-1 for Sr3 Li Na4Be4B10O24F and a = b = 9.3019 (8) ?, c = 37.782 (7) ) 3, Z = 6, F (000) = 2748, Dc = 3.459 g / cm3, Mr = 983.24, R = 0.0158, w ​​R = 0.0455, μ = 3.586 mm-1 for Cd3 Li Na4Be4B10O24F. 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 ℃.