Chirality effects in the structures of jet-cooled bichromophoric dipeptides
| Autor: | Ivan Alata, Anne Zehnacker, Ariel Pérez-Mellor, Valeria Lepere |
|---|---|
| Přispěvatelé: | Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), SYSIPHE, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Dipeptide
010304 chemical physics Diastereomer 010402 general chemistry Resonance (chemistry) Ring (chemistry) 01 natural sciences Atomic and Molecular Physics and Optics 3. Good health 0104 chemical sciences Crystallography chemistry.chemical_compound chemistry 0103 physical sciences [CHIM]Chemical Sciences Physical and Theoretical Chemistry Spectroscopy Chirality (chemistry) Conformational isomerism Excitation ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Molecular Spectroscopy Journal of Molecular Spectroscopy, Elsevier, 2018, 349, pp.71-84. ⟨10.1016/j.jms.2018.02.005⟩ |
| ISSN: | 0022-2852 1096-083X |
| DOI: | 10.1016/j.jms.2018.02.005⟩ |
| Popis: | Diastereomer cyclic dipeptides built on a diketopiperazine (DKP) ring and phenylalanine residues of either identical or opposite chirality have been studied in jet-cooled conditions by combining conformer-specific IR-UV laser spectroscopy. Comparison between the IR-UV double resonance experiments and anharmonic calculations shows the presence of only one conformer of cyclo Phe-Phe, with one aromatic ring folded on the dipeptide DKP ring and the other one extended. This allows weak NH…π and CH…π interactions to take place, which are slightly different in cyclo SPhe-SPhe and cyclo SPhe-RPhe. In both diastereomers, comparison between the S0 and S1 spectra of the all 12C species and that containing one 13C indicates that the electronic excitation is localized on one aromatic ring. This study has been extended to linear SPhe-SPhe and linear SPhe-RPhe, already studied by Abo-Riziq (2005). |
| Databáze: | OpenAIRE |
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