Abstract
Two configurations of the furan-CF3Cl complex have been observed by high-resolution rotational spectroscopy. One is characterized by a dominant Cl lone pair⋯π*aromatic interaction and the other is stabilized by a C-Cl···π-CC- halogen bond. This is the first rotational spectroscopic evidence, to the best of our knowledge, that shows how a complexation with a partner like CF3Cl (the weak lone pair belt of Cl, to be more specific) can modulate both the aromatic π* and diene π characters of a heteroaromatic molecule in the formation of non-covalent interactions. The results emphasize the partner molecules' role in modulating the π electron structure and will not only deepen our understanding on non-covalent interactions but also lead to better designs of heteroaromatic-based drugs and materials.
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