Low-temperature heat capacity of Ir(C5H7O2)(C8H12)
•The sample of Ir(C5H7O2)(C8H12) was synthesized and purified.•The temperature dependence of heat capacity of Ir(C5H7O2)(C8H12) has been measured.•The thermodynamic functions at 298.15K are presented.•An anomaly of heat capacity has been discovered with a maximum at Tc=287.20K. Iridium(I) (acetylace...
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| Published in: | The Journal of chemical thermodynamics Vol. 99; pp. 70 - 74 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
01-08-2016
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | •The sample of Ir(C5H7O2)(C8H12) was synthesized and purified.•The temperature dependence of heat capacity of Ir(C5H7O2)(C8H12) has been measured.•The thermodynamic functions at 298.15K are presented.•An anomaly of heat capacity has been discovered with a maximum at Tc=287.20K.
Iridium(I) (acetylacetonato)(1,5-cyclooctadiene) complex, Ir(C5H7O2)(C8H12), was synthesized and characterized by elemental CH-analysis, NMR, X-ray spectroscopy. The heat capacity of compound Ir(C5H7O2)(C8H12) has been measured by the adiabatic method within the temperature range (6–318)K. The thermodynamic functions: entropy, enthalpy and reduced Gibbs energy have been calculated. They have the following values at 298.15K: C°p=(323.6±0.6)JK−1mol−1, Δ0298.15S°m=(347.0±0.9)JK−1mol−1, Δ0298.15H°m=(50.82±0.09)kJmol−1, Φ°m=(176.5±0.7)JK−1mol−1. The value of the absolute entropy were used to calculate the entropy of formation of Ir(C5H7O2)(C8H12) at T=298.15K. An anomaly of heat capacity has been discovered with a maximum at Tc=287.20K, which points to the phase transition of the complex. Anomalous contributions to entropy and enthalpy have been revealed. |
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| ISSN: | 0021-9614 1096-3626 |
| DOI: | 10.1016/j.jct.2016.03.044 |