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Title: New Insights on the Vibrational Dynamics of 2-Methoxy-, 4-Methoxy- and 4-Ethoxy-Benzaldehyde from INS Spectra and Periodic DFT Calculations
Authors: Ribeiro-Claro, Paulo J. A. 
Vaz, Pedro D. 
Nolasco, Mariela M. 
Gil, Francisco P. S. C. 
Carvalho, Luís A. E. Batista de 
Catarro, Maria Paula M. Marques 
Amado, Ana M. 
Keywords: C–H…O hydrogen bonds; Density functional theory; Inelastic neutron scattering; Molecular crystal; Torsional potential; Vibrational assignment
Issue Date: 2021
Publisher: MDPI
Serial title, monograph or event: Materials
Volume: 14
Issue: 16
Abstract: The dynamics of 2-methoxybenzaldehyde, 4-methoxybenzaldehyde, and 4-ethoxybenzaldehyde in the solid state are assessed through INS spectroscopy combined with periodic DFT calculations. In the absence of experimental data for 4-ethoxybenzaldehyde, a tentative crystal structure, based on its similarity with 4-methoxybenzaldehyde, is considered and evaluated. The excellent agreement between calculated and experimental spectra allows a confident assignment of the vibrational modes. Several spectral features in the INS spectra are unambiguously assigned and torsional potential barriers for the methyl groups are derived from experimental frequencies. The intramolecular nature of the potential energy barrier for methyl rotation about O– CH3 bonds compares with the one reported for torsion about saturated C–CH3 bonds. On the other hand, the intermolecular contribution to the potential energy barrier may represent 1/3 of the barrier height in these systems. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
ISSN: 1996-1944
DOI: 10.3390/ma14164561
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
FCTUC Física - Artigos em Revistas Internacionais

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