Crystal Growth and Design p. 2835 - 2841 (2015)
Update date:2022-08-11
Topics:
Omorodion, Harrison
Twamley, Brendan
Platts, James A.
Baker, Robert J.
The solid-state structures of CF3(CF2)5CH2CO2H and a fluorous triazole are reported, both of which display a wide variety and large number of noncovalent interactions in their packing. The solid-state structure of CF3(CF2)5CH2CO2H is stabilized by multiple F···F contacts but only one C-H···F-C interaction, as well as O-H···O and C-H···O hydrogen bonds. In contrast to other reported structures, the torsion angles in the fluorous chain are close to 180°, which means that the fluorine atoms are eclipsed. A DFT study of the interactions in both compounds show that F···F interactions, along with stacking and C-H···F and C-H···O contacts, are individually weakly energetically stabilizing, but collectively, they can give rise to interaction energies of up to 13 kcal mol-1. A topological approach to the interactions using atoms-in-molecules (AIM) theory reveals that there are bond critical points between the C-F···F-C interactions as well as C-F···H-C interactions that are not recognized when using only the van der Waals distances.
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