Thermochemical Properties of the Complexes RE(HSal)_3·2H_2O (RE=La,Ce,Pr,Nd,Sm)  

作　　者：孙妩娟 杨旭武 张航国 王小燕 高胜利 

机构地区：[1]Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry, Northwest University, Xi'an 710069, China ,Department of Chemistry, Shaanxi University of Technology, Hanzhong 723001, China [2]Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Department of Chemistry, Northwest University, Xi'an 710069, China

出　　处：《Journal of Rare Earths》2006年第4期423-428,共6页稀土学报（英文版）

基　　金：Project supported bythe Northwest University (02NW02) and the Educational Committee of Shaanxi Province (05JC31)

摘　　要：Five solid rare earth salicylate complexes were synthesized by low hydrated lathanide chloride and salicylic acid. The complexes in this experiment were identified as the general formula RE（HSal）3·2H2O（RE = La, Ce, Pr, Nd, Sm） by elemental analysis and EDTA volumetric analysis. IR spectra of the complexes show that carboxyl of salicylic acid coordinates to RE^3＋ ions. Electrochemical behaviors of the complexes on the glass-carbon electrode were researched with cyclic voltammetry （CV）. It is indicated that the electrochemical process of the complexes is a one-electron redox process and the electrochemical reversibility of complexes is less than that of the lanthanide chlorides. The constant-volume combustion energies of complexes,△c U, were determined with a precise rotating-bomb calorimeter at 298.15 K. Their standard molar enthalpies of combustion, △cH^θm, and standard molar enthalpies of formation, △fH^θm, were calculated.Five solid rare earth salicylate complexes were synthesized by low hydrated lathanide chloride and salicylic acid. The complexes in this experiment were identified as the general formula RE（HSal）3·2H2O（RE = La, Ce, Pr, Nd, Sm） by elemental analysis and EDTA volumetric analysis. IR spectra of the complexes show that carboxyl of salicylic acid coordinates to RE^3＋ ions. Electrochemical behaviors of the complexes on the glass-carbon electrode were researched with cyclic voltammetry （CV）. It is indicated that the electrochemical process of the complexes is a one-electron redox process and the electrochemical reversibility of complexes is less than that of the lanthanide chlorides. The constant-volume combustion energies of complexes,△c U, were determined with a precise rotating-bomb calorimeter at 298.15 K. Their standard molar enthalpies of combustion, △cH^θm, and standard molar enthalpies of formation, △fH^θm, were calculated.

关 键 词：THERMOCHEMISTRY salicylic acid cyclic voltammetry combustion energy standard enthalpy of formation rare earths 

分 类 号：O614.33[理学—无机化学]