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Citation: Wu Xin-Ming, Liu Yi, Qu Song-Sheng, Zhang Da-Shun, Liu Ping, Wang Chun-Yan. Determination of Standard Enthalpies of Formation of Rare Earth (RE=Pr,Er) with L-Proline [RE₂(L-Pro)₆(H₂O)₄](ClO₄)₆ Complexes[J]. Acta Physico-Chimica Sinica, ;2001, 17(10): 956-960. doi: 10.3866/PKU.WHXB20011019 shu

Determination of Standard Enthalpies of Formation of Rare Earth (RE=Pr,Er) with L-Proline [RE₂(L-Pro)₆(H₂O)₄](ClO₄)₆ Complexes

1.
College of Chemistry and Molecular Science,Wuhan University,Wuhan　430072；Department of Chemistry and Chemical Engineering,Changde Teacher′s University,Changde　415000

Received Date: 2 April 2001
Available Online: 15 October 2001

Crystals of two complex compounds of rareearth perchlorate with Lproline,[RE2(LPro)6(H2O)4](ClO4)6(RE=Pr,Er),were synthesized.Their structures were characterized using TG,DTA,chemical analytic method and comparing with literatures,and the purity is determined as 99.24％ and 98.20％,respectively.For the calculation of chemical reaction heat,solution heat of the [2RE(NO3)3•6H2O＋6LPro＋6NaClO4•H2O] and the {[RE2(LPro)6(H2O)4](ClO4)6＋6NaNO3} were firstly measured in 2 mol•L1 HCl solvent with an isoperibel reaction calorimeter,respectively.The standard enthalpy of formation of the two crystals were calculated by chemical reaction heat and a designed thermochemical cycle at 298.15 K.The following reaction enthalpy and standard enthalpy of formation were obtained: 　　RE=Pr:ΔrHm=－63.904 kJ•mol－1;RE=Er:ΔrHm=－ 91.017 kJ•mol－1; 　　ΔfHm([Pr2(LPro)6(H2O)4](ClO4)6,s,298.15 K)=－6 594.78 kJ•mol－1; 　　ΔfHm([Er2(LPro)6(H2O)4](ClO4)6,s,298.15 K)=－6 532.87 kJ•mol－1.
- Perchlorate;L-Proline;[RE₂(L-Pro)₆(H₂O)₄](ClO₄)₆(RE=Pr,Er); Reaction heat;Standard enthalpy of formation
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Determination of Standard Enthalpies of Formation of Rare Earth (RE=Pr,Er) with L-Proline [RE2(L-Pro)6(H2O)4](ClO4)6 Complexes

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通讯作者: 陈斌, bchen63@163.com

Determination of Standard Enthalpies of Formation of Rare Earth (RE=Pr,Er) with L-Proline [RE₂(L-Pro)₆(H₂O)₄](ClO₄)₆ Complexes