Exploring the Conformational Space of Cysteine by Matrix Isolation Spectroscopy Combined with Near-Infrared Laser Induced Conformational Change

Six conformers of α-cysteine were identified by matrix isolation IR spectroscopy combined with NIR laser irradiation. Five of these conformers are identical with the five out of six conformers that have recently been identified by microwave spectroscopy. The sixth conformer observed in the present s...

Full description

Saved in:
Bibliographic Details
Published in:The journal of physical chemistry. B 2014-02, Vol.118 (8), p.2093-2103
Main Authors: Najbauer, Eszter E, Bazsó, Gábor, Góbi, Sándor, Magyarfalvi, Gábor, Tarczay, György
Format: Article
Language:English
Subjects:
Argon - chemistry
Complex systems
Cysteine
Cysteine - chemistry
Decay
Infrared radiation
Irradiation
Lasers
Microwave spectroscopy
Models, Molecular
Molecular Conformation
Spectroscopy
Spectroscopy, Near-Infrared
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Six conformers of α-cysteine were identified by matrix isolation IR spectroscopy combined with NIR laser irradiation. Five of these conformers are identical with the five out of six conformers that have recently been identified by microwave spectroscopy. The sixth conformer observed in the present study is a short-lived conformer, which decays by H-atom tunneling; its half-life in a 12 K N2 matrix is (1.1 ± 0.5) × 103 s. This study proves that matrix isolation IR spectroscopy combined with NIR laser irradiation is a suitable method to identify conformers of a complex system for which computations predict several dozens of conformers, and that the reliability of this method for conformational assignment is comparable to that of microwave spectroscopy.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp412550q