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首页> 外文期刊>Crystal growth & design >Crystallization and characterization of magnesium methanesulfonate hydrate Mg(CH_3SO_3)_2?12H_2O
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Crystallization and characterization of magnesium methanesulfonate hydrate Mg(CH_3SO_3)_2?12H_2O

机译：甲磺酸镁水合物Mg（CH_3SO_3）_2？12H_2O的结晶与表征

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Records of methanesulfonate acid in ice cores play an important role in reconstruction of the past history of marine productivity, sea ice extent, and major El Ni?o event activities related to climate changes. Considering the lack of thermodynamic and crystal structure data, crystallization conditions below zero degrees Celsius were mimicked in the laboratory, and magnesium methanesulfonic hydrate crystals, Mg(CH_3SO_3) _2?12H_2O (i.e., [Mg(H_2O) _6](CH_3SO_3)_2?6H_2O) were grown from solution by cooling crystallization and by eutectic freeze crystallization. The solubility lines between -5 and +21 °C and between 0 and 25 wt % are presented. The eutectic point of the system is detected at -5 °C and 14 wt %. The crystal structure analysis and the molecular arrangement of these crystals were determined using single crystal X-ray diffraction (XRD). Reflections were measured at a temperature of 110(2) K. The structure is trigonal with space group R3 (no. 148). The crystal is a colorless block with the following parameters: a = b = 9.27150(8) ?, c = 21.1298(4) ?, V = 1572.99(4) ?~3, Z = 3, and D_(calc) = 1.364 g/cm ~3. The Raman spectrum of Mg(CH_3SO_3) _2?12H_2O salt has been recorded and the principal absorption modes identified. Thermogravimetric analysis confirmed the stochiometry of the Mg(CH_3SO_3)_2?12H _2O salt.
机译：冰芯中甲磺酸的记录在重建过去的海洋生产力，海冰范围以及与气候变化有关的主要厄尔尼诺事件活动中起着重要作用。考虑到缺乏热力学和晶体结构数据，在实验室中模拟了低于零摄氏度的结晶条件，以及甲烷甲磺酸镁水合物晶体Mg（CH_3SO_3）_2？12H_2O（即[Mg（H_2O）_6]（CH_3SO_3）_2？通过冷却结晶和共晶冷冻结晶从溶液中生长出6H_2O）。给出了-5至+21°C和0至25 wt％的溶解度线。在-5°C和14 wt％的温度下检测到系统的共晶点。使用单晶X射线衍射（XRD）确定这些晶体的晶体结构分析和分子排列。反射是在110（2）K的温度下测量的。该结构是三角形的，具有空间组R3（编号148）。晶体是无色块，具有以下参数：a = b = 9.27150（8）？，c = 21.1298（4）？，V = 1572.99（4）？〜3，Z = 3，并且D_（calc）= 1.364克/厘米〜3。记录了Mg（CH_3SO_3）_2→12H_2O盐​​的拉曼光谱，并确定了主要的吸收模式。热重分析证实了Mg（CH_3SO_3）_2→12H _2O盐的化学计量。

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