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采用半微量相平衡方法研究了三元体系La(NCS)3·4.5H2O-18C6-C2H5OH在298.15K的溶解度,测定了各饱和溶液的折光率。该体系形成两种化学计量的配合物,其组成分别为:犤La(NCS)318C6犦·4.5H2O?和犤La2(NCS)6(18C6)3犦·9H2O?,?为溶解一致化合物,?为溶解不一致化合物。依据相平衡结果,制备了两种固态配合物,用IR,DTG,TG,DSC及电导对配合物进行了表征。测量了298.15K时18C6,配合物?在无水乙醇中的热效应,依据本文所设计的热化学循环,求得了溶解一致化合物?的标准生成焓,ΔfHm(犤La(NCS)318C6犦·4.5H2O,s)为-3196.7kJ·mol-1。
The solubility of ternary system La (NCS) 3 · 4.5H2O-18C6-C2H5OH at 298.15K was studied by semi-micro phase equilibrium method. The refractive index of each saturated solution was measured. The system forms two stoichiometric complexes with the following composition: La (NCS) 318C6 犦 · 4.5H2O · and La2 (NCS) 6 (18C6) 3 犦 · 9H2O ·, To dissolve inconsistent compounds. Based on the phase equilibrium results, two solid-state complexes were prepared and the complexes were characterized by IR, DTG, TG, DSC and conductivity. The standard enthalpy of formation, ΔfHm (犤 La (NCS) 318C6 犦 · 4.5H2O, was calculated from the thermodynamic cycle of 18C6 at 298.15K and ethanol in ethanol. , s) is -3196.7 kJ · mol -1.