Enthalpies of sublimation and fusion of monophenylurea and diphenyl-1,3 urea |
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| Institution: | 1. CNR - Centro per la Termodinamica Chimica alle Alte Temperature, Dipartimento di Chimica, Università “La Sapienza” di Roma, P.le A. Moro 5, 001Italy;2. Istituto di Chimica Generale ed Inorganica, Facoltà di Farmacia, Università di Torino, Via P. Giuria 9, 10125 TorinoItaly;1. College of Psychology, Jiangxi Normal University, Nanchang, Jiangxi 330022, PR China;2. College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, PR China;1. Nanoscience Center for Optoelectronic and Energy Devices, Department of Chemistry, Sona College of Technology, Salem 636005, Tamilnadu, India;2. School of Advanced Materials Engineering and Research Center of Advanced Materials Development, Chonbuk National University, Jeonju 561-756, South Korea;1. Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, India;2. Department of Zoology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, India |
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| Abstract: | The sublimation enthalpies of monophenylurea (MPhU) and diphenyl-1,3 urea (1,3-DPhU) have been derived from the dependence of their vapour pressures on temperature, as measured by the torsion-effusion method. Values obtained are: 136 kj mol−1 for MPhU and 152 kJ mol−1 for 1,3-DPhU, where the estimated errors are comprised within 6 kJ mol−1Enthalpies and temperatures of fusion have been measured by differential scanning calorimetry, leading to 23.7 kJ mol−1 and 420.6 K for MPhU, and 34.6 kJ mol−1 and 512 K for 1,3-DPhU. Poor reproducibility of results for 1,3-DPhU seems be due to the beginning of decomposition. No solid-to-solid transitions have been revealed from r.t. to fusion for both compounds. |
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