Uv Photolysis Of Amino Acids In A Solid Parahydrogen Matrix

Moore, Brendan

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https://hdl.handle.net/2142/116733 Copy

Description

Title

Uv Photolysis Of Amino Acids In A Solid Parahydrogen Matrix

Author(s)

Moore, Brendan

Contributor(s)

• Momose, Takamasa
• Djuricanin, Pavle
• Wong, Ying-Tung Angel
• Zeng, Mei Fei
• McKinnon, Alexandra
• Mahoney, Kyle
• Bashiri, Termeh
• Toh, Shin Yi

Issue Date

2022-06-21

Keyword(s)

Photodissociation and photochemistry

Abstract

Matrix isolation has recently proven successful for the spectroscopic characterization of amino acids in their neutral form. Here, we utilize solid parahydrogen, a cage-free matrix host, to study the photochemistry of a number of amino acids. The photochemistry of alanine, glycine, leucine, proline, and serine will be presented. Irradiation by 213 nm light resulted in $\alpha$-carbonyl C-C bond cleavage and hydrocarboxyl (HOCO) radical production from all five amino acids. The temporal behavior of the Fourier-transform infrared spectra revealed that HOCO radicals rapidly reach a steady state, which occurs predominantly due to photodissociation of HOCO into CO + OH or \ce{CO2} + H. In alanine, glycine, and leucine, the amine radicals generated by the $\alpha$-carbonyl C-C bond cleavage rapidly undergo hydrogen elimination to yield ethanimine, methanimine and 3-methylbutane-1-imine, respectively. As an analogue to gas phase photochemistry, the photodissociation pathways identified here provide new insights into the behavior of amino acids in interstellar space.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116733

DOI

https://doi.org/10.15278/isms.2022.TJ10

Copyright and License Information

Copyright 2022 held by the authors

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