Thermodynamic study of the sublimation of crystalline tris(1,1,1-trifluoro-2,4-pentanedionate)ruthenium(III) and tris(1,1,1,5,5,5-hexafluoro-2,4-pentanedionate)ruthenium(III) |
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| Institution: | 1. The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, China;2. Department of General Surgery, Dongguan People’s Hospital, Wanjiang District, Dongguan 523000, China;3. Department of Chemistry, Dr. Ram Manohar Lohiya Awadh University, Ayodhya, India;4. Department of Chemistry, Sri Venkateswara College, University of Delhi, New Delhi 110021, India;5. Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226007, India;1. Institute of Bioorganic & Medicinal Chemistry, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China;2. School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, PR China;3. National and Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, College of Pharmacy, Chongqing University of Arts and Sciences, Chongqing 402160, PR China;1. College of pharmacy, Guizhou University of Traditional Chinese Medicine, Guizhou (550025), China;2. College of pharmacy, Zhejiang Chinese Medical University, Hangzhou (310053), China;3. Affiliated hospital of integrated traditional Chinese and western medicine, Nanjing university of Chinese medicine, Nanjing (210028), China;4. College of pharmacy, Nanjing University of Chinese medicine, Nanjing (210023), China;5. School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing (210023), China |
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| Abstract: | The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of two crystalline ruthenium complexes: tris(1,1,1-trifluoro-2,4-pentanedionate)ruthenium(III) {Ru(tfacac)3}, between T = 350.20 K and T = 369.17 K and tris(1,1,1,5,5,5-hexafluoro-2,4-pentanedionate)ruthenium(III) {Ru(hfacac)3} between T = 299.15 K and T = 313.14 K. From the temperature dependence of the vapour pressure of the crystalline compounds, the standard molar enthalpies of sublimation were derived by the Clausius–Clapeyron equation and the molar entropies of sublimation at equilibrium pressures were calculated. By using an estimated value for the heat capacity differences between the gas and the crystal phases the standard, po = 105Pa, molar enthalpies, entropies, and Gibbs energies of sublimation at T = 298.15 K, were derived: |
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