Experimental standard molar enthalpies of formation of crystalline 3,5-dimethylpyrazole, 3,5-dimethyl-4-nitrosopyrazole, 1,3,5-trimethyl-4-nitrosopyrazole,and 3,5-dimethyl-1-phenyl-4-nitrosopyrazole |
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| Institution: | 1. Centro de Investigação em Quı́mica, Departamento de Quı́mica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007, Porto, Portugal;2. Department of Chemistry, University of North Texas, Denton, TX 76203-5070, U.S.A.;1. Department of Chemistry, Govt. Engineering College Kozhikode, West Hill 673005, Kerala, India;2. Department of Physics, Govt. College Madappally, Vadakara, Kozhikode 6731002, Kerala, India;1. Reumatología y Enfermedades Óseas, Rosario, Argentina;2. Bone Biology Laboratory, School of Medicine, Rosario National University, Argentina;3. National Council of Scientific and Technical Research (CONICET), Argentina;4. Centro Rossi, Buenos Aires, Argentina;5. Consultorio de Reumatologia y Osteoporosis, Lujan, Argentina;6. Hospital Nacional Prof. A. Posadas, Buenos Aires, Argentina;7. Hospital Italiano de Buenos Aires, Buenos Aires, Argentina;8. Hospital Privado de Rosario (Grupo Gamma), Rosario, Argentina;9. Instituto de Rehabilitación Psicofísica (IREP), Buenos Aires, Argentina;10. Ceim Investigaciones Médicas, Buenos Aires, Argentina;11. Hospital Provincial del Centenario, Rosario, Argentina;1. Departamento de Química Física, Facultad de Química, Campus de Excelencia Internacional Regional “Campus Mare Nostrum”, Universidad de Murcia, 30100 Campus de Espinardo, Murcia, Spain;2. CEISAM, UMR CNRS 6230, BP 92208, Université de Nantes, 2, Rue de la Houssinière, 44322 Nantes, Cedex 3, France;3. Institut Universitaire de France, 103 bd St Michel, 75005 Paris Cedex 5, France;1. Physics Department, Robeson Hall (0435), Virginia Tech, Blacksburg, VA 24061, USA;2. Mathematical Institute, University of Oxford, Andrew Wiles Building, Oxford OX2 6GG, UK |
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| Abstract: | The standard (po = 0.1 MPa) molar enthalpies of combustion in oxygen, at T = 298.15 K, for crystalline 3,5-dimethylpyrazole (Me2Pyr), 3,5-dimethyl-4-nitrosopyrazole (Me2PyrNO), 1,3,5-trimethyl-4-nitrosopyrazole (Me3PyrNO), and 3,5-dimethyl-1-phenyl-4-nitrosopyrazole (Me2PhPyrNO) were measured by static-bomb calorimetry. These values were used to derive the standard molar enthalpies of formation of the crystalline compounds. The standard molar enthalpies of sublimation for these four compounds were measured by microcalorimetry.The experimental results obtained allow us to derive the values of the standard molar enthalpies of formation, in the gaseous state, for the monomeric compounds involved in this work. These last values are discussed comparatively with results previously obtained for some aromatic nitroso derivatives. |
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