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Title: Crystal structure and properties of l-tryptophanium hydrogen selenite
Authors: Paixão, José António 
Silva, Manuela Ramos 
Beja, Ana Matos 
Eusébio, Ermelinda 
Keywords: Phase transition; Hydrogen bonds; DSC measurements; Optical properties
Issue Date: 2006
Citation: Polyhedron. 25:9 (2006) 2021-2025
Abstract: l-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.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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