三元配合物[RE(Gly)_4(Im)(H_2O)](ClO_4)_3(RE=La,Pr)的热化学研究  

Thermochemical Study of Ternary Complexes of [RE(Gly)_4(Im)(H_2O)](ClO_4)_3(s) (RE= La, Pr)

作　　者：赵艳茹[1] 但悠梦 刘义[3] 屈松生[3] 

机构地区：[1]河南许昌学院化学系,河南许昌461000 [2]湖北民族学院,湖北恩施445000 [3]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《稀土》2004年第6期5-9,共5页Chinese Rare Earths

基　　金：教育部高校优秀青年教师教学科研奖励计划项目资助

摘　　要：利用自行研制的新型恒温环境反应量热计,以2mol·L-1HCl做溶剂,分别测定了LaCl3·7H2O、PrCl3·6H2O、[La(Gly)4(Im)(H2O)](ClO4)3、[Pr(Gly)4(Im)(H2O)](ClO4)3、Im、NaClO4、Gly、NaCl在298.15K时的溶解焓,再通过设计的热化学循环求得化学反应的摩尔反应焓,利用这些结果和其它辅助数据,计算出两种配合物的标准摩尔生成焓分别为:ΔfH m{[Prm{[La(Gly)4(Im)(H2O)](ClO4)3,s}=-3459.3±0.2kJ·mol-1;ΔfH (Gly)4(Im)(H2O)](ClO4)3,s}=-3460.63±0.18kJ·mol-1。The molar dissolution enthalpies of the reactions and products of the two coordination reaction, LaCl_3·7H_2O + Im + 4Gly + 3NaClO_4= [La(Gly)_4(Im)(H_2O)](ClO_4)_3+3NaCl+6H_2O and PrCl_3·6H_2O + Im + 4Gly + 3NaClO_4= [Pr(Gly)_4(Im)(H_2O)](ClO_4)_3+3NaCl+5H_2O, were measured by isoperibol solution calorimetry, the calorimetric solvent is 2mol·L^(-1) HCl.From the results and other auxiliary quantities, the standard molar enthalpies of formation of [La(Gly)_4(Im)(H_2O)](ClO_4)_3(s) and [Pr(Gly)_4(Im)(H_2O)](ClO_4)_3(s) were derived, Δ_fH~_m{[La(Gly)_4(Im)(H_2O)](ClO_4)_3, s} = -3459.3±0.2 kJ·mol^(-1) and Δ_fH~_m{[Pr(Gly)_4(Im)(H_2O)]·ClO_4)_3, s} = -3460.63±0.18 kJ ·mol^(-1), respectively.

关 键 词：溶解-反应量热 标准摩尔生成焓 稀土高氯酸盐 甘氨酸 咪唑 

分 类 号：O614.33[理学—无机化学] O642.3[理学—化学]