Аннотация
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.
Язык оригинала | английский |
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Страницы (с-по) | 147-153 |
Число страниц | 7 |
Журнал | Journal of Chemical Thermodynamics |
Том | 130 |
DOI | |
Состояние | Опубликовано - 1 янв 2019 |