Studies on Phase Equilibrium and Thermochemistry of La(NCS)3·4.5H2O with Bl5C5 in C2H5OH

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (9): 1344.

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Studies on Phase Equilibrium and Thermochemistry of La(NCS)₃·4.5H₂O with Bl5C5 in C₂H₅OH

XUE Gang-Lin¹, DANG Gao-Chao¹, LI Qian-Ding¹, REN De-Hou¹, ZHANG Quan-Zhen², SONG Di-Sheng²

1. Department of Chemistry, Northwest University Xi'an, 710069;
2. Research Laboratory of Thermochemistry Northwest University Xi'an, 710069

Received:1994-12-07 Revised:1995-04-25 Online:1995-09-24 Published:1995-09-24

Abstract

Abstract: The solubilities of the ternary system, La(NCS)₃·4.5H₂O-B15C5-C₂H₅OH, were investigated at 298.15 K by a semimicro method for study of phase equilibrium and the refractive indexes of saturated solutions were determined.Astoichiometrical coordination compound, La(NCS)₃·B15C5·4.5H₂O(I), formed in the system.The solid coordination compound was prepared and characterized by IR, TG, DTG, DSCand conductivity measurement.The integral heats of solution of La(NCS)₃·4. 5H₂O in B15C5-C₂H₅OH solution,the complex(I) and B15C5 in C₂H₅OH were measured calorimetrically at 298.15 K. By means of thermochemical reactions suggested in this paper, the standard molar enthalpy of formation for(I) was obtained.

Key words: Phase equilibrium, Complex, Crown ether Bl5C5, Lanthanum isothiocyanate, Standard molar enthalpy of formation

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XUE Gang-Lin, DANG Gao-Chao, LI Qian-Ding, REN De-Hou, ZHANG Quan-Zhen, SONG Di-Sheng . Studies on Phase Equilibrium and Thermochemistry of La(NCS)₃·4.5H₂O with Bl5C5 in C₂H₅OH[J]. Chem. J. Chinese Universities, 1995, 16(9): 1344.

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Studies on Phase Equilibrium and Thermochemistry of La(NCS)₃·4.5H₂O with Bl5C5 in C₂H₅OH

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