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Crystals 2018, 8(6), 245; https://doi.org/10.3390/cryst8060245

The Behavior of the Deformation Vibration of NH3 in Semi-Organic Crystals under High Pressure Studied by Raman Spectroscopy

1
Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz-MA 65900-410, Brazil
2
Departamento de Engenharias, Universidade Ceuma, Imperatriz-MA 65903-093, Brazil
3
Departamento de Física, Universidade Federal do Ceará, Fortaleza-CE 60455-760, Brazil
*
Author to whom correspondence should be addressed.
Received: 4 May 2018 / Revised: 28 May 2018 / Accepted: 5 June 2018 / Published: 7 June 2018
(This article belongs to the Section Crystal Engineering)
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Abstract

Single-crystal samples of the semi-organic compounds mono-l-alaninium nitrate and monoglycine nitrate have been studied by Raman spectroscopy in a diamond-anvil cell up to 5.5 GPa, in order to observe the behavior of the deformation mode of NH3 units. It was observed for these semi-organic crystals that increasing pressure produces a decrease in the wavenumber of the band associated with the deformation vibration, differently from most of the modes. Comparatively, mono-l-alaninium has a higher dν/dP than monoglycine nitrate, for the band associated with the deformation vibration. The anomalous behavior is explained in terms of the effect of high pressure in the short and linear intermolecular hydrogen bonds. View Full-Text
Keywords: semi-organic crystals; high-pressures; raman spectroscopy semi-organic crystals; high-pressures; raman spectroscopy
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Cavaignac, A.L.O.; Soares, R.A.; Lima, R.J.C.; Façanha Filhoo, P.F.; Freire, P.T.C. The Behavior of the Deformation Vibration of NH3 in Semi-Organic Crystals under High Pressure Studied by Raman Spectroscopy. Crystals 2018, 8, 245.

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