Crystal Structures, Lattice Potential Energies, and Thermochemical Properties of Crystalline Compounds (1-CnH2n+1NH3)2ZnCl4(s) (

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• 作者：Yupu Liu ; Youying Di ; Donghua He ; Qian Zhou ; Jianmin Dou
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：November 7, 2011
• 年：2011
• 卷：50
• 期：21
• 页码：10755-10764
• 全文大小：1035K
• 年卷期：v.50,no.21(November 7, 2011)
• ISSN：1520-510X

文摘

As part of our ongoing project involving the study of (1-C_nH_2n+1NH₃)₂MCl₄(s) (where M is a divalent metal ion and n = 8鈥?8), we have synthesized the compounds (1-C_nH_2n+1NH₃)₂ZnCl₄(s) (n = 8, 10, 12, and 13), and the details of the structures are reported herein. All of the compounds were crystallized in the monoclinic form with the space group P2₁/n for (1-C₈H₁₇NH₃)₂ZnCl₄(s), P2₁/c for (1-C₁₀H₂₁NH₃)₂ZnCl₄(s), P2₁/c for (1-C₁₂H₂₅NH₃)₂ZnCl₄(s), and P2₁/m for (1-C₁₃H₂₇NH₃)₂ZnCl₄(s). The lattice potential energies and ionic volumes of the cations and the common anion of the title compounds were obtained from crystallographic data. Molar enthalpies of dissolution of the four compounds at various molalities were measured at 298.15 K in the double-distilled water. According to Pitzer鈥檚 theory, molar enthalpies of dissolution of the title compounds at infinite dilution were obtained. Finally, using the values of molar enthalpies of dissolution at infinite dilution (螖_sH_m^{鈭?/sup>) and other auxiliary thermodynamic data, the enthalpy change of the dissociation of [ZnCl₄]2鈥?/sup>(g) for the reaction [ZnCl₄]2鈥?/sup>(g)鈫?Zn2+(g) + 4Cl鈥?/sup>(g) was obtained, and then the hydration enthalpies of cations were calculated by designing a thermochemical cycle.}