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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/EH22_008%2F0004649" target="_blank" >EH22_008/0004649: Quantum Engineering and Nanotechnology</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

1463-9084

Volume of the periodical

26

Issue of the periodical within the volume

15

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

12053-12059

UT code for WoS article

001197157000001

EID of the result in the Scopus database

2-s2.0-85189686370