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A close competition between O–H⋯O and O–H⋯π hydrogen bonding: IR spectroscopy of anisole–methanol complex in helium nanodroplets.
- Source :
- Physical Chemistry Chemical Physics (PCCP); 10/21/2020, Vol. 22 Issue 39, p22408-22416, 9p
- Publication Year :
- 2020
-
Abstract
- Anisole is a multifunctional molecule that can form intermolecular complexes via its aromatic π-electron system as well as its methoxy group. We have studied the complexation of anisole with methanol. This serves as a prototype system to explore the competition between O–H⋯O, O–H⋯π, C–H⋯O and C–H⋯π hydrogen bonding. The anisole⋯methanol molecular complexes were formed in superfluid helium droplets and were detected using high-resolution laser-infrared spectroscopy, in the frequency range between 2630 and 2730 cm<superscript>−1</superscript> covering the O–D stretches of methanol-d<subscript>4</subscript> (CD<subscript>3</subscript>OD). Several bands assigned to (anisole)<subscript>m</subscript>⋯(methanol)<subscript>n</subscript> complexes (where m = 1, and 2 and n = 1) were observed. The experimental results are complemented by the ab initio electronic structure calculations at the MP2/6-311++G(d,p) and B3LYP-D3/aug-cc-pVTZ levels of theory. Based on a comparison of the observed spectra with the ab initio theoretical spectra, we suggest that for the anisole⋯methanol complex, structures bound via O–H⋯O and O–H⋯π hydrogen bonding are almost equally preferred. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639076
- Volume :
- 22
- Issue :
- 39
- Database :
- Complementary Index
- Journal :
- Physical Chemistry Chemical Physics (PCCP)
- Publication Type :
- Academic Journal
- Accession number :
- 146508637
- Full Text :
- https://doi.org/10.1039/d0cp02589e