四氯合锌酸正九烷铵的晶体结构及热化学性质

摘要

合成了四氯合锌酸正九烷铵复合物(C9H19NH3)2ZnCl4(s)(C9Zn(s)),并使用X射线单晶衍射、化学分析以及元素分析确定了其晶体结构和化学组成.利用其晶体学数据推导了C9Zn(s)的晶格能UPOT=952.94 kJ·mol-1.在298.15 KF,利用恒温环境溶解-反应热量计测定了C9Zn(s)在不同质量摩尔浓度下的摩尔溶解焓.在Pitzer电解质溶液理论基础上确定了C9Zn(s)的无限稀释摩尔溶解焓△sH∞m=20.09 kJ·mol-1,以及Pitzer焓参数组合(4β(0)L C9H19NH3,Cl+2β(0)L Zn,Cl+θL C9H19NH3,Zn)和(2β(1)L C9H19NH3,Cl+β(1)L Zn,Cl)的值.%We synthesized crystalline bis(n-nonylammonium) tetrachlorozincate (C9H19NH3)2ZnCl4(s) (C9Zn(s)). X-ray single crystal diffraction, chemical analysis, and elemental analysis were used to determine the crystal structure and composition of the complex. The lattice potential energy UPOT was calculated to be 952.94 kJ · mol-1 from crystallographic data. The molar enthalpies of C9Zn(s) dissolution using various molalities were measured in double-distilled water by an isoperibol solution-reaction calorimeter at 298.15 K. According to Pitzer's electrolyte solution theory the molar enthalpy of dissolution of C9Zn(s) at infinite dilution (△sH∞m) was calculated to be 20.09 kJ · mol-1 and the sums of Pitzer's parameters (4β(0)L C9H19NH3,Cl+2β(0)L Zn,Cl+θL C9H19NH3,Zn)and(2β(1)L C9H19NH3,Cl+β(1)L Zn,Cl) were pbtaomed.