ISSN:
1573-1111
Keywords:
phase diagram
;
Werner clathrate
;
thermodynamic parameters
;
copper(II) complex
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract In the first part of the work, thephase diagram of the benzene -ndash;[CuPy4(NO3)2] system has beendetermined in the -100 to +200 °C temperaturerange using DTA and solubility techniques. The onlycompound found in the system is the[CuPy4(NO3)2]β 2C6H6clathrate. It is stable up to a temperature of+104.2(5) °C at which it melts incongruently togive liquid and the solid [CuPy4(NO3)2]host phase. At 146.1(5) °C exfoliation into twoliquid phases is observed, with the composition of themonotectic point being close to that of the clathrate.In the second part of the work, thermodynamicparameters of the clathrate dissociation have beendetermined from benzene vapour pressure strainmeasurements. For the process1/2 [CuPy4(NO3)2]β2C6H6(solid) = 1/2 [CuPy4(NO3)2] (solid) +C6H6 (gas) Δ H° = 45.3(3) kJ/mole;Δ S298° = 126(1) J/(mole K);Δ G298° = 7.7(5) kJ/mole.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008162514955
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