Infrared spectroscopy study of cyclopentanol self-associations

Solvent-assisted alcohol-isocyanate kinetics

“…However, in most studies, the concentration dependent distribution of monomeric and aggregated alcohol is not considered, making it questionable to attach any molecular meaning to the reaction order. Such data are available for cyclopentanol in the solvents used [1].…”

High pressure and low-temperature polymorphism in cyclopentanol

“…[14] It has been reported that there were two plastic phases and two ordered crystalline phases below the melting point. [5] According to this result, we can conclude that cyclopentanol shows the first plastic phases (phase I) below the melting point of 254 K. Below 222 K, another plastic phase (phase II) is formed. The first ordered phase (phase III) is found to be stable below the temperature of 206 K. Below 172 K, another crystalline structure, phase IV, is formed.…”

“…However, two crystal phases III and IV at lower temperature are completely in order in both position and orientation. [5] Many distinct changes are observed in the spectra, including the band sharpening and new peak appearance. Figure 3 displays the Raman spectrum of cyclopentanol at different pressures.…”

“…This result is in good agreement with the previous report that cyclopentanol would crystallize in the plastic phase at around 0.7 GPa, on subsequent compression to 1.5 GPa, a fully ordered crystalline phase with monoclinic structure is found to be stable. [5] It is reported that compression can cause significant variations in the relative strength of the hydrogen bond, which played an important role in its high pressure structure. [12,19] Figure 7 represents the Raman spectra of cyclopentanol under different pressures in the region of wavenumbers 2500 to 3450 cm −1 .…”

“…[3,4] Two plastic crystal phases and more solid-to-solid phase transitions were reported below melting point. [5] It is well known that, besides temperature, pressure is another important thermodynamic parameter that greatly influences the structure and properties. Upon compression, structural and chemical stabilities can be completely altered due to changes in the intermolecular and intramolecular distances.…”