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https://hdl.handle.net/10316/4402
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. | URI: | https://hdl.handle.net/10316/4402 | DOI: | 10.1002/ejic.200600298 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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