Infrared Studies of Hydrogen Bonding in Isopropanol and in Mixtures of Isopropanol with Poly (nhyphen;Butyl Methacrylate) and with Poly(Propylene Oxide)

摘要

Infrared spectra have been measured in the 3hyphen;mgr; region for isopropanol in carbon tetrachloride solutions from 0.005 to 1.0Mand from 0deg; to 60deg;C. Equilibrium constants for cyclic dimer formation were calculated from the spectral data for this temperature range. The enthalpy for cyclic dimer formation is minus;5.7plusmn;0.9 kcalsol;mole. Infrared spectra have also been measured for three hydrogenhyphen;bonding systems with isopropanol as the proton donor over the same temperature range. The proton acceptors were dihyphen;isopropyl ether, liquid poly (propylene oxide), and poly (nhyphen;butyl methacrylate). Equilibrium constants were determined. The enthalpies of formation for the three complexes are minus;2.1plusmn;0.4, minus;3.8plusmn;0.8, and minus;2.4plusmn;0.5 kcalsol;mole, respectively.