Journal of Physical Chemistry A, Vol.109, No.5, 915-921, 2005
Infrared and ab initio studies on 1,2,4,5-tetrafluorobenzene clusters with methanol and 2,2,2-trifluoroethanol: Presence and absence of an aromatic C-H center dot center dot center dot O hydrogen bond
The (1:1) clusters of 1,2,4,5-tetrafluorobenzene (TFB) with methanol and with 2,2,2-trifluoroethanol (TFE) were studied both experimentally and computationally. Through use of fluorescence-detected infrared spectroscopy, the (1:1) clusters were identified in supersonic jets. Intermolecular interactions in the clusters were characterized by the spectral shifts of the aromatic C-H stretching modes in the TFB moiety owing to the cluster formation. The molecular structures, stabilization energies, and vibrational frequencies of the clusters were computed at the MP2/6-31+G* level. Both computational and experimental data indicate that an aromatic C-(HO)-O-... hydrogen bond is present in the TFB-methanol cluster, while it is absent in the TFB-TFE cluster.