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.
