Physicochemical Nature of Perfluoroalkyl Compounds Induced by Fluorine

Abstract

Perfluoroalkyl (R ) compounds have unique characters represented by a significantly high hydrophobic property, which often makes us consider that R groups should be interacted with each other via the 'hydrophobic interaction' as found for a normal hydrocarbon. Due to a similar intuitive and simplistic speculation, the R -specific material properties have long been enveloped in darkness for comprehensive understanding, which should lucidly be discussed within a framework of physical chemistry. Here, we show studies on the stratified dipole arrays (SDA) theory, which readily explains the R -specific material characters in a comprehensive manner based on only a few fundamental physical parameters of fluorine. The SDA theory encompasses some conventional theories that account for only a part of material properties. In addition, we show that the concept of vibrational spectroscopy of R compounds should also be revised, since the mass of fluorine is larger than that of carbon, which is opposite to the hydrocarbon case. In this manner, chemistry of R compounds needs another fully revised concept, which cannot be replaced by an extended concept of normal hydrocarbon compounds.

Thermotropic liquid crystalline properties of (hydroxypropyl)cellulose derivatives with butyryl and heptafluorobutyryl substituents

“…As is generally known, fluoropolymers having a perfluoroalkyl side chain show unique properties represented by the water-and oil-repellency, low dielectric permittivity, low refractive index, etc. (Hasegawa 2017). The perfluoroalkyl (Rf) chains take an attitude of spontaneous aggregation induced by the dipole-dipole interaction, and the above-mentioned bulk properties of fluoropolymers seem to be dominated strongly by the intrinsic interaction between the Rf groups (Hasegawa 2015(Hasegawa , 2017.…”

“…(Hasegawa 2017). The perfluoroalkyl (Rf) chains take an attitude of spontaneous aggregation induced by the dipole-dipole interaction, and the above-mentioned bulk properties of fluoropolymers seem to be dominated strongly by the intrinsic interaction between the Rf groups (Hasegawa 2015(Hasegawa , 2017. By deduction, the 7FBu groups of the cellulose derivative Bu7FBu-HPC would also show such a habit of attractive interaction that becomes noticeable in frequency when the DS7FBu is increased.…”

Study of Perfluoroalkyl Chain-Specific Band Shift in Infrared Spectra on the Chain Length

“…4,5 This Rf chain-specific character of the peak shift is, in fact, useful for distinguishing the Rf chain length. 2,3 However, the mechanism of the unusual shift is not revealed.…”

Development of Solid Catalyst–Solid Substrate Reactions for Efficient Utilization of Biomass

“…It is assumed that the CHπ interactions are not permanent dipolequadrupole interactions, but mainly dispersion force because of the low dipole moment of CH groups (® = 0.40 D). 54 Tsuzuki performed quantum calculations to clarify the force working between π electrons of benzene and a CH group of methanol, which can be regarded as an analog of CH groups in cellulose. 55 The total energy of the CHπ interactions was ¹8.28 kJ mol ¹1 in the coupled cluster theory including the single, double, and perturbative triple excitation [CCSD(T)] model, one of the most accurate levels of theory.…”