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

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Abstract
Infrared spectra have been measured in the 3‐μ region for isopropanol in carbon tetrachloride solutions from 0.005 to 1.0M and from 0° to 60°C. Equilibrium constants for cyclic dimer formation were calculated from the spectral data for this temperature range. The enthalpy for cyclic dimer formation is −5.7±0.9 kcal/mole. Infrared spectra have also been measured for three hydrogen‐bonding systems with isopropanol as the proton donor over the same temperature range. The proton acceptors were di‐isopropyl ether, liquid poly (propylene oxide), and poly (n‐butyl methacrylate). Equilibrium constants were determined. The enthalpies of formation for the three complexes are −2.1±0.4, −3.8±0.8, and −2.4±0.5 kcal/mole, respectively.