Complexation thermodynamics of rare earth(Ⅲ)-crown ether.Ⅱ.calorimetric of complexation of the arm type 15-crown-5 and arm type 18-crown-6 with rare earth(Ⅲ)nitrates in  anhydrous acetonitrile

Acta Chimica Sinica ›› 1993, Vol. 51 ›› Issue (9): 874-879. Previous Articles Next Articles

Original Articles

稀土(Ⅲ)-冠醚配位作用的热力学性质Ⅱ:臂式15-冠-5和臂式18-冠-6与稀土(Ⅲ)硝酸盐在无水乙腈溶液中配位的量热滴定

刘育;鲁统部;谭民裕;井上佳久;白子忠男

中国科学院兰州化学物理研究所;兰州大学化学系;日本姬路工业大学物质科学系;日本姬路工业大学应用化学系

发布日期:1993-09-15

Complexation thermodynamics of rare earth(Ⅲ)-crown ether.Ⅱ.calorimetric of complexation of the arm type 15-crown-5 and arm type 18-crown-6 with rare earth(Ⅲ)nitrates in anhydrous acetonitrile

LIU YU;LU TONGBU;TAN MINYU;JING SHANGJIAJIU;BAI ZIZHONGNAN

Published:1993-09-15

Abstract

Calorimetric titrns. at 298.15 K in anhydrous acetonitrile were used to determine the stability constants and thermodn. parameters for 1:1 complexes of rare earth (III) nitrates with N-benzyl-monoaza-15-crown-5 and N-benzyl-monoaza-18-crown-6 (the latter with La and Ce only). The stability constants, heats and entropies were calculated from data obtained by precision calorimetry. The effect of the crown ether size, spatial arrangement and other factors influencing the stability of the complexes are discussed.

Key words: THERMODYNAMIC PROPERTIES, NITROGEN HETEROCYCLICS, STABILITY CONSTANT, CROWN ETHER COMPOUNDS, NITRATE, ENTROPY, ENTHALPY, STERIC EFFECT, RARE EARTH COMPOUNDS, ACETONITRILE

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LIU YU;LU TONGBU;TAN MINYU;JING SHANGJIAJIU;BAI ZIZHONGNAN. Complexation thermodynamics of rare earth(Ⅲ)-crown ether.Ⅱ.calorimetric of complexation of the arm type 15-crown-5 and arm type 18-crown-6 with rare earth(Ⅲ)nitrates in anhydrous acetonitrile[J]. Acta Chimica Sinica, 1993, 51(9): 874-879.

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稀土(Ⅲ)-冠醚配位作用的热力学性质Ⅱ:臂式15-冠-5和臂式18-冠-6与稀土(Ⅲ)硝酸盐在无水乙腈溶液中配位的量热滴定

Complexation thermodynamics of rare earth(Ⅲ)-crown ether.Ⅱ.calorimetric of complexation of the arm type 15-crown-5 and arm type 18-crown-6 with rare earth(Ⅲ)nitrates in anhydrous acetonitrile

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