Add time:08/14/2019         Source:sciencedirect.com

The mid- and near-infrared spectra of hydrogen bond complexes between phenol derivatives and N,N-dimethylformamide are investigated. The enthalpies of complex formation determined in carbon tetrachloride range from 23 to 26.6 kJ mol−1. Some spectroscopic features observed in the mid- and near-infrared region are discussed. The first overtone of the ν(OH…O) vibration is very broad and characterized by several submaxima which are tentatively assigned to a coupling between high and low frequency modes. The anharmonicities of the ν(OH…O) vibration determined from the experimental frequencies observed in the mid-infrared and near-infrared region range between 117 and 150 cm−1. The correlation between the enthalpies and experimental or harmonic frequency shifts is discussed. Comparison with complexes involving the same proton donors and N-methyldiacetamide shows that the anharmonicity roughly increases with the hydrogen bond strength.

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