Vibrational Spectroscopy of N-3(-) in the Gas and Condensed Phase

Salehi, Seyedeh Maryam and Koner, Debasish and Meuwly, Markus. (2019) Vibrational Spectroscopy of N-3(-) in the Gas and Condensed Phase. Journal of Physical Chemistry B, 123 (15). pp. 3282-3290.

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Official URL: https://edoc.unibas.ch/94200/

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Azido-derivatized amino acids are potentially useful, positionally resolved spectroscopic probes for studying the structural dynamics of proteins and macromolecules in solution. To this end, a computational model for the vibrational modes of N 3 - based on accurate electronic structure calculations and a reproducing kernel Hilbert space representation of the potential energy surface for the internal degrees of freedom is developed. Fully dimensional quantum bound state calculations yield the antisymmetric stretch vibration at 1974 cm -1 compared with 1986 cm -1 from experiment. This mode shifts by 64 cm -1 (from the frequency distribution) and 74 cm -1 (from the IR line shape) to the blue, respectively, compared with 61 cm -1 from experiment for N 3 - in water. The decay time of the frequency fluctuation correlation function is 1.1 ps, which is in good agreement with experiment (1.2-1.3 ps) and the full width at half maximum of the asymmetric stretch in solution is 18.5 cm -1 compared with 25.2 cm -1 from experiment. A computationally more efficient analysis based on instantaneous normal modes is shown to provide comparable, albeit somewhat less quantitative results compared to solving the three-dimensional Schrödinger equation for the fundamental vibrations.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Physikalische Chemie (Meuwly)
UniBasel Contributors:Meuwly, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:03 Apr 2023 08:46
Deposited On:03 Apr 2023 08:46

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