The donor OH stretching-libration dynamics of hydrogen-bonded methanol dimers in cryogenic matrices
The donor OH stretching-libration dynamics of hydrogen-bonded methanol dimers in cryogenic matrices Heger, M.; Andersen, J. M.; Suhm, M. A. & Larsen, R. W. (2016) Physical Chemistry Chemical Physics, 18(5) pp. 3739-3745.
Heger, Matthias; Andersen, J. M.; Suhm, Martin A. ; Larsen, Rene Wugt
Royal Soc Chemistry
Physical Chemistry Chemical Physics
Institut für Physikalische Chemie
FTIR spectra of the methanol dimer trapped in neon matrices are presented. The fundamental, overtone and combination bands involving the donor OH libration and stretching motions were observed in order to extract relevant anharmonicity constants. We find a stretching-libration coupling constant of +43(5) cm(-1) and a diagonal librational anharmonicity constant of -71(5) cm(-1). The spectra are compared to a number of VPT2 calculations and a torsionally localized monomer model in order to enhance previous explanations of the observable OH stretching red-shift upon dimerization.