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An infrared spectroscopic study of trifluoromethoxybenzene⋯methanol complexes formed in superfluid helium nanodroplets†
Tarun Kumar Roy,Devendra Mani,Gerhard Schwaab,Martina Havenith
Physical Chemistry Chemical Physics Pub Date : 09/27/2021 00:00:00 , DOI:10.1039/D1CP03136H
Abstract

We have studied the intermolecular complex formation between trifluoromethoxybenzene and methanol (CD3OD) in superfluid helium droplets by infrared spectroscopy in the spectral range of 2630–2730 cm−1, covering the O–D stretches of methanol-d4 (CD3OD). The cluster size associated with the observed bands is deduced from the variation of infrared intensity of a particular band with the partial pressures of trifluoromethoxybenzene and methanol. Quantum chemical calculations are performed at the MP2/6-311++G(d,p) level of theory to complement the experimental results. As a result, we have identified six different conformers of the trifluoromethoxybenzene⋯methanol intermolecular complex: three bound via O–H⋯O hydrogen bonds and the other three via O–H⋯π hydrogen bonds. Furthermore, to access the effect of fluorination on the methyl unit of anisole molecules, we compare the IR spectrum of trifluoromethoxybenzene (C6H5OCF3)⋯methanol with our earlier reported spectrum of anisole (C6H5OCH3)⋯methanol.

Graphical abstract: An infrared spectroscopic study of trifluoromethoxybenzene⋯methanol complexes formed in superfluid helium nanodroplets
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