Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 25, Pages 10929-10938Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp902194h
Keywords
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Funding
- Fonds der Chemischen Industrie
- DFG [Su 121/2]
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Supersonic jet Raman spectroscopy reveals an increasing bathochromic shift of the OH stretching vibration in the most stable conformation of propanol with increasing extent of argon nanocoating. It falls short of the bulk matrix limit of 17 cm(-1) even at large nozzle distances. Quantum chemical harmonic frequency calculations up to the CCSD(T) level show that this shift cannot be accounted for by individual Ar atoms or even a first solvation layer but instead requires several layers of Ar atoms around the molecule to be explained. It is shown that the stability of Ar-propanol clusters correlates with the number of close O and C contacts to the Ar and that bathochromic shifts are largely caused by backbone solvation. Hydrogen-bonding OH solvation tends to slightly increase the OH stretching frequency but is very sensitive to the computational level.
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