Thermochemistry on the Solid State Coordination Compounds M(Nic)2 · H2O(s) (M = Mn and Mg, Nic = Nicotinate)
Thermochemistry on the Solid State Coordination Compounds M(Nic)2 · H2O(s) (M = Mn and Mg, Nic = Nicotinate)
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DOI：
10.1524/zpch.2009.5449
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Y. Kong;Y. Di;Wei-wei Yang;Guo-zheng Zhao;Kun Zhang;Z. Tan
中科院分区：
文献类型：
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作者：
Y. Kong;Y. Di;Wei-wei Yang;Guo-zheng Zhao;Kun Zhang;Z. Tan
摘要 采用室温固相合成和球磨机的方法合成了两种新型固态配位化合物——一水烟酸锰和一水烟酸镁。应用 FTIR、化学和元素分析以及 X 射线粉末衍射技术来表征这些配合物的结构和组成。根据赫斯定律设计热化学循环，利用等温方程测定烟酸与四水醋酸锰、四水醋酸镁固相反应的焓变为ΔrH0m,l = (39.66±0.36) kJ·mol–1和ΔrH0m,2 = (40.73±0.17) kJ·mol–1分别是溶液反应量热计。标题配合物 M(Nic)2·H2O(s) 的标准摩尔形成焓计算为 ΔfH0Mn(Nic)2·H2O = –(1165.01±2.01) kJ·mol–1 和 ΔfH0Mg(Nic)2·H2O = –(1390.49±1.99) kJ·mol–1溶解和其他辅助热力学数据。此外，比较了M(Nic)2·H2O(s)(M=Mg、Mn、Zn)的标准摩尔生成焓值，可以得出[–ΔfH0Zn(Nic)2·H2O] < [–ΔfH0Mn(Nic)2·H2O] < [–ΔfH0Mg(Nic)2·H2O]的变化规律，并与三者的稳定性相关。一水合烟酸盐。
Abstract Two novel solid state coordination compounds – manganese nicotinate monohydrate and magnesium nicotinate monohydrate were synthesized by the method of room temperature solid phase synthesis and ball grinder. FTIR, chemical and elemental analyses and X-ray powder diffraction techniques were applied to characterize the structure and composition of these complexes. In accordance with Hess’ law, hermochemical cycles were designed, the enthalpy changes of the solid phase reactions of nicotinic acid with manganese acetate tetrahydrate and magnesium acetate tetrahydrate were determined as ΔrH0m,l = (39.66±0.36) kJ · mol–1 and ΔrH0m,2 = (40.73±0.17) kJ · mol–1 by use of an isoperibol solution-reaction calorimeter, respectively. The standard molar enthalpy of formation of the title complexes M(Nic)2 · H2O(s) were calculated as ΔfH0Mn(Nic)2·H2O = –(1165.01±2.01) kJ · mol–1 and ΔfH0Mg(Nic)2·H2O = –(1390.49±1.99) kJ · mol–1 by use of the enthalpies of dissolution and other auxiliary thermodynamic data. In addition, the values of the standard molar enthalpies of formation of M(Nic)2·H2O(s) (M = Mg, Mn, Zn) were compared, a law of change of [–ΔfH0Zn(Nic)2·H2O] < [–ΔfH0Mn(Nic)2·H2O] < [–ΔfH0Mg(Nic)2·H2O] can be obtained, and was in relation with the stability of the three monohydrated nicotinates.