Photoelectron spectroscopy of the deprotonated tryptophan anion: the contribution of deprotomers to its photodetachment channels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F24%3A00585161" target="_blank" >RIV/61388955:_____/24:00585161 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0352903" target="_blank" >https://hdl.handle.net/11104/0352903</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d4cp00309h" target="_blank" >10.1039/d4cp00309h</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photoelectron spectroscopy of the deprotonated tryptophan anion: the contribution of deprotomers to its photodetachment channels

Popis výsledku v původním jazyce

Photoelectron spectroscopy and electronic structure calculations are used to investigate the electronic structure of the deprotonated anionic form of the aromatic amino acid tryptophan, and its chromophore, indole. The photoelectron spectra of tryptophan, recorded at different wavelengths across the UV, consist of two direct detachment channels and thermionic emission, whereas the h nu = 4.66 eV spectrum of indole consists of two direct detachment features. Electronic structure calculations indicate that two deprotomers of tryptophan are present in the ion beam, deprotonation of the carboxylic acid group (Trp(i)-) or the N atom on the indole ring (Trp(ii)-). Strong similarities are observed between the direct detachment channels in the photoelectron spectra of tryptophan and indole, which in conjunction with electronic structure calculations, indicate that electron loss from Trp(ii)- dominates this portion of the spectra. However, there is some evidence that direct detachment of Trp(i)- is also observed. Thermionic emission is determined to predominantly arise from the decarboxylation of Trp(i)-, mediated by the pi pi* excited state near lambda = 300 nm, which results in an anionic fragment with a negative electron affinity that readily autodetaches.

Název v anglickém jazyce

Photoelectron spectroscopy of the deprotonated tryptophan anion: the contribution of deprotomers to its photodetachment channels

Popis výsledku anglicky

Photoelectron spectroscopy and electronic structure calculations are used to investigate the electronic structure of the deprotonated anionic form of the aromatic amino acid tryptophan, and its chromophore, indole. The photoelectron spectra of tryptophan, recorded at different wavelengths across the UV, consist of two direct detachment channels and thermionic emission, whereas the h nu = 4.66 eV spectrum of indole consists of two direct detachment features. Electronic structure calculations indicate that two deprotomers of tryptophan are present in the ion beam, deprotonation of the carboxylic acid group (Trp(i)-) or the N atom on the indole ring (Trp(ii)-). Strong similarities are observed between the direct detachment channels in the photoelectron spectra of tryptophan and indole, which in conjunction with electronic structure calculations, indicate that electron loss from Trp(ii)- dominates this portion of the spectra. However, there is some evidence that direct detachment of Trp(i)- is also observed. Thermionic emission is determined to predominantly arise from the decarboxylation of Trp(i)-, mediated by the pi pi* excited state near lambda = 300 nm, which results in an anionic fragment with a negative electron affinity that readily autodetaches.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/EH22_008%2F0004649" target="_blank" >EH22_008/0004649: Kvantové inženýrství a nanotechnologie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

1463-9084

Svazek periodika

26

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

12053-12059

Kód UT WoS článku

001197157000001

EID výsledku v databázi Scopus

2-s2.0-85189686370