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Thermodynamic Properties of Rare Earth (III) -Crownether Coordination Reactions Ⅱ. Calorimetric Tit-ration Studies on Coordination Reactions of Lanthanide Perchlorates with Dibenzo-18-Crown-6 in Anhydrous Acetonitrile

Huang, Xi-Rong Jiang, Ben-Gao~* Yin, Jing-Zhi (Departmenv of Chemistry, Shandong University, Jinan, 250100) Yan, Hai-Ke (Institute of Chemistry, Academia Sinica, Beijing, 100080)  
The coordination reactions of dibenzo-18-crown-6 with lanthanide perchlorates except Pm, Lu in anhydrous acetonitrile were investigated at 298.15 Kby titration calorimeter. The formation constants and enthalpies of coordination reactions were calculated uaing computer program made by ourselves. The changes of free energy and entropy of every coordination reaction were obtained. The influences of lanthanide cations (Ⅲ) on the coordination reactions were discussed. Comparisons were also made on the thermodynamic properties for coordination reaction of lanthanum perchlorate with dibenzo-18-crown-6 and with other crowns in anhydrous acetonitrile, respectively.
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