Add time:08/04/2019         Source:sciencedirect.com

Infrared spectra for both gaseous (4000-1000 cm−1) and polycrystalline (4000-400 cm−1) samples of dimethylphosphinic acid (CH3)2POOH (DMPA) at various temperatures are reported and discussed. The main attention is focused on the hydrogen bond vibrations. For the first time, the characteristic ABC structure of the ν(OH) band, occurring in the spectra of solid samples of strongly hydrogen bonded complexes was observed in the gas phase spectra of DMPA dimers. In spite of different types of aggregates present in the solid state a similar shape of the ν(OH) absorption was found in the crystalline sample spectra. However, an inverse intensity distribution of the ABC subbands was observed. The presented results fully confirm the explanation of the ABC structure as being due to the Fermi resonances between ν(OH) and overtones of the deformation modes 2δ(OH) and 2γ(OH).

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