Zn(NO3)2-Leu-H2O体系(25℃)的相平衡及新相配合物的合成与性质

用半微量相平衡方法研究了硝酸锌-亮氨酸-水体系在25℃及全浓度范围内的溶度性质,绘制了体系的相图和饱和溶液折光率曲线,发现并制备了未见报道的非一致溶解配合物[Zn(Leu)(NO3)2(H20)]·H20(A)和Zn(Leu)2(NO3)2·H20(B),通过化学分析、元素分析、IR和TG-DTG等对其组成、结构及热稳定性进行了研究.用精密转动弹热量计测定配合物的标准燃烧能分别为(-12692.80±5.83)和(-15345.71±9.11)J/g,求得它们的标准燃烧焓分别为(-4523.22±2.08)和(-7208.86±4.28)kJ/mol,标准生成焓分别为(-615.67±2.27)和(-1863.16±4.60)kJ/mol

Synthesis, Properties and Phase Equilibrium of Zn(NO3)2-Leu-H2O System(25 ℃)

The solubility of Zn(NO3)2-Leu-H20 system at 25 ℃ in the entire concentration range has been investigated by phase equilibrium method. The corresponding phase diagram and refractive index diagram have been constructed. The incongruently soluble complexes [Zn(Leu)(NO3)2(H20)]·H20(A) and [Zn(Leu)2(NO3)2·H20(B)] which have not been reported in literature, have been prepared. The compounds are characterized by IR spectra, TG-DTG, as well as chemical and elemental analyses. The constant volume combustion energies of the complexes, ΔcE(complex, s), have been determined by a precision rotating bomb calorimeter at 298.15 K. The standard enthalpies of combustion, ΔcHmθ(complex, s), and standard enthalpies of formation, ΔfHmθ(complex, s), are calculated for the complexes.