Structure and vibrational spectra of α-hydroxy isobutyric acid in the crystalline and glassy phases and isolated in inert gas matrixes
文献信息
Susana Jarmelo, Rui Fausto
Infrared spectra of monomeric α-hydroxy isobutyric acid (HIBA) isolated in argon, krypton and xenon matrixes (at 8 K) are reported. It is shown that in all the studied matrixes HIBA exists preferentially as the intramolecularly H-bonded SsC conformer, where the HOCC, OCCO and OCOH dihedrals are 0°. In addition to the SsC form, two higher energy conformers (AaT and GskC) could be observed experimentally for the first time. The spectra of the three observed conformers were assigned on the basis of density functional theory calculations (B3LYP/6-31G*) and their relative energies estimated from relative band intensities. Raman and infrared spectra of both crystalline and low temperature glassy states were also recorded and interpreted. In consonance with previously reported X-ray structural studies (W. P. J. Gaykema, J. A. Kanters and G. Roelofsen, Cryst. Struct. Commun., 1978, 7, 463), the vibrational data now obtained are consistent with the exclusive presence in the crystalline phase of molecules assuming a conformation similar to that of the lowest energy monomer observed in the matrixes (SsC conformer).
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.












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