Synthesis, Structure and Thermodynamic Property of a New Lithium Borate： Li4[B8O13（OH）2]·3H2O  

作　　者：李平 刘志宏 

机构地区：[1]Key Laboratory for Macromoleeular Science of Shaanxi Province,School of Chemistry and Chemical Engineering,Shaanxi Normal University,Xi'an,Shaanxi 710062,China

出　　处：《Chinese Journal of Chemistry》2012年第4期847-853,共7页中国化学（英文版）

摘　　要：A new hydrated lithium borate, Li4[B8O13（OH）2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It crystal- lizes in the triclinic, space group P]-, a=8.4578（5） A, b=8.7877（5） A, c= 10.8058（7） A, a=87.740（3）°, β= 71.819（3）°, γ=61.569（3）°, Z=2, V=665.26（7） A3, Dc=2.043 g/cm3. Its crystal structure features polyborate ani- onic layers with the larger odd 13-membered boron rings constructed by [B8O13（OH）2]4- FBBs. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be -（7953.8 ± 6.6） kJ·mol-1 by using a heat conduction microcalorimeter.A new hydrated lithium borate, Li4[B8O13（OH）2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It crystal- lizes in the triclinic, space group P]-, a=8.4578（5） A, b=8.7877（5） A, c= 10.8058（7） A, a=87.740（3）°, β= 71.819（3）°, γ=61.569（3）°, Z=2, V=665.26（7） A3, Dc=2.043 g/cm3. Its crystal structure features polyborate ani- onic layers with the larger odd 13-membered boron rings constructed by [B8O13（OH）2]4- FBBs. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be -（7953.8 ± 6.6） kJ·mol-1 by using a heat conduction microcalorimeter.

关 键 词：lithium borate hydrothermal synthesis crystal structure THERMOCHEMISTRY 

分 类 号：O614.111[理学—无机化学] TQ424.25[理学—化学]