| LaL3(NO3)3·(H2O)2·(C2H5OH)2的晶体结构和生成反应焓变 |
| Crystal Structure and Enthalpy Change of Formation Reaction for LaL3(NO3)3·(H2O)2·(C2H5OH)2 |
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| 摘要: |
| 关键词: 水合硝酸镧 对二甲氨基苯甲醛缩三氮唑 晶体结构 微量热法 热化学 |
| 基金项目: |
| Abstract: The solid complex of lanthanum nitrate hydrate LaL3(NO3)3·(H2O)2·(C2H5OH)2 with 4-(p-dimethylamino-benzaldehydeamino)-4H-1,2,4-triazole (L) was synthesized in dry N2 atmosphere and absolute alcohol. The compo-sition of the complex was determined by chemical and elemental analyses. The crystal structure showed that La3+ was coordinated by ten oxygen atoms with three nitrates, two waters and two alcohols. It crystallizes in a monoclinic system, space group Cc with a=8.464 9(12) nm, b=17.593 3(19) nm, c=33.902(3) nm, β=90.152(2)°, Z=4. The enthalpies of solution of lanthanum nitrate hydrate and L in absolute alcohol at 298.15 K and the enthalpy change of liquid-phase reaction of formation for complex LaL3(NO3)3·(H2O)2·(C2H5OH)2 were determined by a microcalorimeter as (-35.254±0.004), (-59.687±0.017) and (-6.926±0.015) kJ·mol-1, respectively. The enthalpy change of the solid-phase reaction of formation was obtained through a thermochemical cycle. CCDC: 727762. |
| Keywords: lanthanum nitrate hydrate 4-(p-dimethylaminobenzaldehydeamino)-4H-1,2,4-triazole (L) crystal structure microcalorimetric method thermochemistry |
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| 赵庆山,周惠良,毛菊林,胡奇林,刘万毅.LaL3(NO3)3·(H2O)2·(C2H5OH)2的晶体结构和生成反应焓变[J].无机化学学报,2009,25(6):1124-1128. |
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