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Open AccessArticle

The Behavior of NH3+ Torsional Vibration in Amino Acids: A Raman Spectroscopic Study

1
Universidade CEUMA, Campus Imperatriz, R. Barão do Rio Branco, 100- Entroncamento, Imperatriz-MA 65903093, Brazil
2
Universidade Federal do Maranhão, Campus Avançado Bom Jesus, Av. da Universidade, S/N-Dom Afonso Felipe Gregory, Imperatriz-MA 65915240, Brazil
3
Universidade Federal do Ceará, Departamento de Física, Campus do Pici, Fortaleza 60440900, Brazil
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(10), 517; https://doi.org/10.3390/cryst9100517
Received: 13 August 2019 / Revised: 13 September 2019 / Accepted: 16 September 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Raman Spectroscopy of Crystals)
In this work we present the continuation of studies carried out on the changes of geometric parameters of the hydrogen bonds in amino acid crystals subjected to temperature or pressure variations. Changes in geometric parameters of the hydrogen bonds are correlated with the temperature behavior of the Raman wavenumber of NH3+ torsional band. Now four monocrystals, L-valine, L-isoleucine, taurine, and L-arginine hydrochloride monohydrate, are studied. Temperature evolution of the Raman wavenumber of NH3+ torsional band, with positive slope (dν/dT = 0.023 cm−1/K) of L-isoleucine, can be related to the stability of the crystal structure and the hydrogen bonds strengths on heating due to different temperature lattice parameters variation. View Full-Text
Keywords: amino acid crystals; ammonium torsional vibration; hydrogen bond amino acid crystals; ammonium torsional vibration; hydrogen bond
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Cavaignac, A.L.O.; Lima, R.J.C.; Freire, P.T.C. The Behavior of NH3+ Torsional Vibration in Amino Acids: A Raman Spectroscopic Study. Crystals 2019, 9, 517.

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