Standard molar enthalpies of formation and lattice energies of 1-methylethyl, n-butyl and 2-methylpropyl ammonium halides

dc.creatorSouza, AG
dc.creatorMelo, AMS
dc.creatorSantos, LCR
dc.creatorEspinola, JGP
dc.creatorOliveira, SF
dc.creatorAiroldi, C
dc.date1998
dc.dateAPR 14
dc.date2014-12-02T16:24:37Z
dc.date2015-11-26T16:09:28Z
dc.date2014-12-02T16:24:37Z
dc.date2015-11-26T16:09:28Z
dc.date.accessioned2018-03-28T22:58:03Z
dc.date.available2018-03-28T22:58:03Z
dc.identifierThermochimica Acta. Elsevier Science Bv, v. 313, n. 2, n. 175, n. 180, 1998.
dc.identifier0040-6031
dc.identifierWOS:000073292700009
dc.identifier10.1016/S0040-6031(98)00244-5
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/74532
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/74532
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/74532
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1266626
dc.descriptionStandard molar enthalpies of formation of 1-methylethyl, (CH3)(2)CHNH3X, n-butyl, CH3(CH2)(3)NH3X and 2-methylpropyl, (CH3)(2)CHCH2NH3X, ammonium halides (X=Cl, Br, I) have been determined by solution-reaction calorimetry at 298.15+/-0.02 K. Heat capacities for solid and liquid phases were determined for the means of differential scanning calorimetry and estimated by gaseous phase through the generalized vibrational assignment method. Starting from the equivalent methyl cation derivative, the molar standard enthalpies of both cations were estimated by a group contribution method. From these values, the lattice energies of the salts have been calculated via a thermochemical cycle. The lattice energies decrease from chloride to iodide for all three series of compounds. Semi-empirical methods were used to determine the thermochemical cation radii. These values depend on the number of carbon atoms in the organic chain and the position of the attached methyl group on the branched carbon chain. (C) 1998 Elsevier Science B.V.
dc.description313
dc.description2
dc.description175
dc.description180
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationThermochimica Acta
dc.relationThermochim. Acta
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subject1-methylethyl ammonium
dc.subjectn-butyl ammonium
dc.subject2-methylpropyl ammonium
dc.subjectcalorimetry
dc.subjectcation radii
dc.subjectlattice energy
dc.titleStandard molar enthalpies of formation and lattice energies of 1-methylethyl, n-butyl and 2-methylpropyl ammonium halides
dc.typeArtículos de revistas


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