Enthalpies of formation of cis -azobenzene and trans -azobenzene
Identifieur interne : 001F77 ( Main/Exploration ); précédent : 001F76; suivant : 001F78Enthalpies of formation of cis -azobenzene and trans -azobenzene
Auteurs : A. R. Dias [Portugal] ; M. E. Minas Da Piedade [Portugal] ; J. A. Martinho Sim Es [Portugal] ; J. A. Simoni [Portugal] ; C. Teixeira [Portugal] ; H. P. Diogo [Portugal] ; Yang Meng-Yan [Royaume-Uni] ; G. Pilcher [Royaume-Uni]Source :
- The Journal of Chemical Thermodynamics [ 0021-9614 ] ; 1992.
English descriptors
- Teeft :
- Calorimeter, Calorimetric value, Carbon dioxide, Chem, Combustion experiments, Dias, Dicyclopentadienyltitanium diiodide, Diethyl ether, Elliptical reflector, Enthalpy, Gaseous state, Heptane, Heptane solution, Heptane solutions, Isomerization, Keithley multimeter, Knudsen method, Light petroleum, Molar enthalpy, Moura ramos, Photomicrocalorimetric measurements, Potential difference, Standard deviation, Toluene solution, Trans, Tungsten lamp, Vapour pressure, Vapour pressures.
Abstract
The standard (p° = 0.1 MPa) molar enthalpy of formation of crystalline trans-azobenzene was determined from its enthalpy of combustion in oxygen at 298.15 K measured by static-bomb calorimetry. The enthalpy of isomerization: ΔisomH°m(cr, cis → trans)/(kJ · mol−1) = -(49.1 ± 1.0), was measured by reaction-solution calorimetry: the isomerization was catalysed by dicyclopentadienyltitanium diiodide in toluene solution. The enthalpy of isomerization in heptane solution: ΔisomH°m(trans → cis)/(kJ · mol−1) = -(48.9 ± 2.3) when coupled with the enthalpies of solution of the two forms in heptane confirmed the reaction-solution calorimetric value. For the crystalline solids:ΔfH∘m(trans-azobenzene, cr)/(k/J · mol-1) = (308.6 ± 1.9),ΔfH∘m(cis-azobenzene, cr)/(k/J · mol-1) = (357.7 ± 2.1)The enthalpy of sublimation of trans-azobenzene was determined from the variation of vapour pressure with temperature measured by the Knudsen method: ΔgcrH°m(trans-azobenzene)/ (kJ · mol−1) = (93.6±1.9).
Url:
DOI: 10.1016/S0021-9614(05)80161-2
Affiliations:
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R." last="Dias">A. R. Dias</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Minas Da Piedade, M E" sort="Minas Da Piedade, M E" uniqKey="Minas Da Piedade M" first="M. E." last="Minas Da Piedade">M. E. Minas Da Piedade</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Martinho Sim Es, J A" sort="Martinho Sim Es, J A" uniqKey="Martinho Sim Es J" first="J. A." last="Martinho Sim Es">J. A. Martinho Sim Es</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Simoni, J A" sort="Simoni, J A" uniqKey="Simoni J" first="J. A." last="Simoni">J. A. Simoni</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Teixeira, C" sort="Teixeira, C" uniqKey="Teixeira C" first="C." last="Teixeira">C. Teixeira</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Diogo, H P" sort="Diogo, H P" uniqKey="Diogo H" first="H. P." last="Diogo">H. P. Diogo</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento de Engenharia Química, Instituto Superior Técnico, 1096 Lisboa Codex</wicri:regionArea><wicri:noRegion>1096 Lisboa Codex</wicri:noRegion></affiliation></author><author><name sortKey="Meng Yan, Yang" sort="Meng Yan, Yang" uniqKey="Meng Yan Y" first="Yang" last="Meng-Yan">Yang Meng-Yan</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Chemistry, University of Manchester, Manchester M13 9PL</wicri:regionArea><orgName type="university">Université de Manchester</orgName><placeName><settlement type="city">Manchester</settlement><region type="nation">Angleterre</region><region nuts="2" type="region">Grand Manchester</region></placeName></affiliation></author><author><name sortKey="Pilcher, G" sort="Pilcher, G" uniqKey="Pilcher G" first="G." last="Pilcher">G. 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The enthalpy of isomerization: ΔisomH°m(cr, cis → trans)/(kJ · mol−1) = -(49.1 ± 1.0), was measured by reaction-solution calorimetry: the isomerization was catalysed by dicyclopentadienyltitanium diiodide in toluene solution. The enthalpy of isomerization in heptane solution: ΔisomH°m(trans → cis)/(kJ · mol−1) = -(48.9 ± 2.3) when coupled with the enthalpies of solution of the two forms in heptane confirmed the reaction-solution calorimetric value. For the crystalline solids:ΔfH∘m(trans-azobenzene, cr)/(k/J · mol-1) = (308.6 ± 1.9),ΔfH∘m(cis-azobenzene, cr)/(k/J · mol-1) = (357.7 ± 2.1)The enthalpy of sublimation of trans-azobenzene was determined from the variation of vapour pressure with temperature measured by the Knudsen method: ΔgcrH°m(trans-azobenzene)/ (kJ · mol−1) = (93.6±1.9).</div></front></TEI><affiliations><list><country><li>Portugal</li><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Grand Manchester</li></region><settlement><li>Manchester</li></settlement><orgName><li>Université de Manchester</li></orgName></list><tree><country name="Portugal"><noRegion><name sortKey="Dias, A R" sort="Dias, A R" uniqKey="Dias A" first="A. R." last="Dias">A. R. Dias</name></noRegion><name sortKey="Diogo, H P" sort="Diogo, H P" uniqKey="Diogo H" first="H. P." last="Diogo">H. P. Diogo</name><name sortKey="Martinho Sim Es, J A" sort="Martinho Sim Es, J A" uniqKey="Martinho Sim Es J" first="J. A." last="Martinho Sim Es">J. A. Martinho Sim Es</name><name sortKey="Minas Da Piedade, M E" sort="Minas Da Piedade, M E" uniqKey="Minas Da Piedade M" first="M. E." last="Minas Da Piedade">M. E. Minas Da Piedade</name><name sortKey="Simoni, J A" sort="Simoni, J A" uniqKey="Simoni J" first="J. A." last="Simoni">J. A. Simoni</name><name sortKey="Teixeira, C" sort="Teixeira, C" uniqKey="Teixeira C" first="C." last="Teixeira">C. Teixeira</name></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Meng Yan, Yang" sort="Meng Yan, Yang" uniqKey="Meng Yan Y" first="Yang" last="Meng-Yan">Yang Meng-Yan</name></region><name sortKey="Pilcher, G" sort="Pilcher, G" uniqKey="Pilcher G" first="G." last="Pilcher">G. Pilcher</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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