Probe of Alcohol Structures in the Gas and Liquid States Using C–H Stretching Raman Spectroscopy

Abstract

Vibrational spectroscopy is a powerful tool for probing molecular structures and dynamics since it offers a unique fingerprint that allows molecular identification. One of important aspects of applying vibrational spectroscopy is to develop the probes that can characterize the related properties of molecules such as the conformation and intermolecular interaction. Many examples of vibrational probes have appeared in the literature, including the azide group (–N3), amide group (–CONH2), nitrile groups (–CN), hydroxyl group (–OH), –CH group and so on. Among these probes, the –CH group is an excellent one since it is ubiquitous in organic and biological molecules and the C–H stretching vibrational spectrum is extraordinarily sensitive to the local molecular environment. However, one challenge encountered in the application of C–H probes arises from the difficulty in the accurate assignment due to spectral congestion in the C–H stretching region. In this paper, recent advances in the complete assignment of C–H stretching spectra of aliphatic alcohols and the utility of C–H vibration as a probe of the conformation and weak intermolecular interaction are outlined. These results fully demonstrated the potential of the –CH chemical group as a molecular probe.

Diffusivities in Binary Mixtures of n-Hexane or 1-Hexanol with Dissolved CH4, Ne, Kr, R143a, SF6, or R236fa Close to Infinite Dilution

“…Consistent with our previous studies, , no influence of the solute on the spectra of the C 6 H 14 or C 6 H 14 O solvent molecules was found in this work. To evaluate the fluid structure, the CH- and OH-stretching domains are of particular interest as they can give qualitative information on the population of trans and gauche conformers ,, and hydrogen bonding, which both can influence the magnitude of D 11 .…”

Promotion Effect of Succinimide on Amyloid Fibrillation of Hen Egg-White Lysozyme

“…Spontaneous Raman spectroscopy was performed as described elsewhere. ,− Briefly, in a back-scattering geometry, a continuous-wave laser (532 nm, Verdi V5, Coherent) with 1 W power was focused on the solutions in a 10 mm × 10 mm quartz cuvette by an f = 5 cm lens, and the confocal Raman scattering was converged into a triple monochromator (TriplePro; Acton Research) through an f = 20 cm lens. The dispersed spectra were recorded using a liquid-nitrogen-cooled CCD detector (Spec-10:100B; Princeton Instruments).…”