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dc.contributor.authorPaixão, José António-
dc.contributor.authorSilva, Manuela Ramos-
dc.contributor.authorBeja, Ana Matos-
dc.contributor.authorEusébio, Ermelinda-
dc.identifier.citationPolyhedron. 25:9 (2006) 2021-2025en_US
dc.description.abstractl-Tryptophanium hydrogen selenite was synthesised and structurally characterised at room and low temperature. The aminoacid is positively charged with the amine and carboxylic group protonated. It adopts a staggered conformation with the N1 gauche to C4 that is gauche to C1. The anion displays a pyramidal conformation with three different Se-O bond lengths, one characteristic of a double bond, another of a single bond and the third with an intermediate character. At room temperature there is a disordered hydrogen atom between the carboxylic group of the cation and the O atom of the anion with the intermediate Se-O bond length. At low temperature this hydrogen atom orders and attaches to the carboxylic group. This ordering is most likely related to the transition seen in DSC measurements occurring at -82.5 °C.en_US
dc.subjectPhase transitionen_US
dc.subjectHydrogen bondsen_US
dc.subjectDSC measurementsen_US
dc.subjectOptical propertiesen_US
dc.titleCrystal structure and properties of l-tryptophanium hydrogen seleniteen_US
item.fulltextCom Texto completo-
item.grantfulltextopen- de Ciências e Tecnologia, Universidade de Coimbra- de Ciências e Tecnologia, Universidade de Coimbra- de Coimbra- de Coimbra- for Physics, University of Coimbra- Chemistry Center-
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais
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