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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleStandard molar enthalpies of formation and lattice energies of 1-methylethyl, n-butyl and 2-methylpropyl ammonium halidespt_BR
dc.contributor.authorSouza, AGpt_BR
dc.contributor.authorMelo, AMSpt_BR
dc.contributor.authorSantos, LCRpt_BR
dc.contributor.authorEspinola, JGPpt_BR
dc.contributor.authorOliveira, SFpt_BR
dc.contributor.authorAiroldi, Cpt_BR
unicamp.authorUniv Fed Paraiba, CCEN, Dept Quim, BR-58059900 Joao Pessoa, Paraiba, Brazil Univ Fed Sergipe, CCET, Dept Quim, Aracaju, Sergipe, Brazil Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazilpt_BR
dc.subject1-methylethyl ammoniumpt_BR
dc.subjectn-butyl ammoniumpt_BR
dc.subject2-methylpropyl ammoniumpt_BR
dc.subjectcation radiipt_BR
dc.subjectlattice energypt_BR
dc.description.abstractStandard 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
dc.relation.ispartofThermochimica Actapt_BR
dc.relation.ispartofabbreviationThermochim. Actapt_BR
dc.publisherElsevier Science Bvpt_BR 14pt_BR
dc.identifier.citationThermochimica Acta. Elsevier Science Bv, v. 313, n. 2, n. 175, n. 180, 1998.pt_BR
dc.sourceWeb of Sciencept_BR
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dc.description.provenanceMade available in DSpace on 2015-11-26T16:09:28Z (GMT). No. of bitstreams: 2 WOS000073292700009.pdf: 85225 bytes, checksum: 68610d4fa508ec666394b23897ee207b (MD5) WOS000073292700009.pdf.txt: 19338 bytes, checksum: e7d985e9c46ecb1ce1770696316198a2 (MD5) Previous issue date: 1998en
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