Order-disorder phase transitions in Zn2(C8H4O4)2 .C6H12N2 in atmospheres of noble gases

D. P. Pishchur, N. B. Kompankov, A. A. Lysova, S. G. Kozlova

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4 Citations (Scopus)

Abstract

The molar heat capacity of Zn2(C8H4O4)2 .C6H12N2 (Zn-DMOF) was measured for the first time at 4.8–302 K in atmospheres of noble gases 3He, 4He, and 40Ar under pressures P up to 1.52·105 Pa. It is shown that phase transitions reported earlier at Tc = 13, 58.9, and 131.2 K are second-order phase transitions associated with the ordering/disordering of organic ligands in Zn-DMOF. The transition entropy (ΔSm) in the temperature range of phase transitions associated with the ordering/disordering of C6H12N2 molecules decreases at Tc = 13 K and increases at Tc = 58.9 K as P increases from 0.51·105 to 1.52·105 Pa. The values of ΔSm do not depend on P in the region of the phase transition at Tc = 131.2 K associated with the ordering/disordering of C8H4O4 2− anions.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalJournal of Chemical Thermodynamics
Volume130
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Adiabatic calorimetry
  • Heat capacity
  • Noble gases loading
  • Phase transition
  • Zn-DMOF
  • STORAGE
  • METAL-ORGANIC FRAMEWORKS
  • BEHAVIOR
  • FLEXIBILITY
  • HEAT-CAPACITY
  • MOLECULES

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