ON THE THERMOCHEMISTRY OF INTERCALATION OF N-ALKYLAMINES INTO ALPHA-TITANIUM HYDROGENPHOSPHATE

dc.creatorAIROLDI, C
dc.creatorDEOLIVEIRA, SF
dc.date1991
dc.dateJAN
dc.date2014-12-16T11:34:35Z
dc.date2015-11-26T18:01:59Z
dc.date2014-12-16T11:34:35Z
dc.date2015-11-26T18:01:59Z
dc.date.accessioned2018-03-29T00:43:37Z
dc.date.available2018-03-29T00:43:37Z
dc.identifierStructural Chemistry. Plenum Publ Corp, v. 2, n. 1, n. 41, n. 46, 1991.
dc.identifier1040-0400
dc.identifierWOS:A1991FL93500007
dc.identifier10.1007/BF00673488
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/81702
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/81702
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/81702
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1292111
dc.descriptionLamellar alpha-titanium hydrogenphosphate (alpha-TiP) suspended in water or 1,2-dichloroethane (dce) intercalates approximately 7.70 meq g 1 of n-alkylamines (C1-C4), as determined by potentiometry and thermogravimetry. The thermal decomposition of the intercalates takes place in three stages: dehydration, removal of amines, and condensation of the hydrogenphosphate to pyrophosphate. The increase in the alpha-TiP interlayer distance (7.56 X 10(2) pm) during the intercalation was followed by x-ray powder diffraction. The standard enthalpy (DELTA-r(H)m-degrees) involved in the overall reaction O3PO-H + RNH2 --> O3P-O +H-3NR, which was determined by reaction-dissolution calorimetry, correlates linearly with the number of carbons in the alkyl chain and with the interlamellar distance. An intercalation mechanism is proposed, starting from the amine protonation by POH groups and its insertion between the sheets. An increase in enthalpy of -2.67 and +2.56 kJ mol-1 or -1.24 and +1.20 kJ mol 1/10(2) pm for each CH2 group of the n-alkyl chain in dce and water, respectively, for this series of amines is prosposed.
dc.description2
dc.description1
dc.description41
dc.description46
dc.languageen
dc.publisherPlenum Publ Corp
dc.publisherNew York
dc.relationStructural Chemistry
dc.relationStruct. Chem.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectInsoluble Acid Salts
dc.subjectZirconium-phosphate
dc.subjectIon-exchange
dc.subjectTetravalent Metals
dc.subjectForms
dc.titleON THE THERMOCHEMISTRY OF INTERCALATION OF N-ALKYLAMINES INTO ALPHA-TITANIUM HYDROGENPHOSPHATE
dc.typeArtículos de revistas


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