Computational study finds fluorine in flatland

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1 While other planar tetracoordinate systems with carbon, nitrogen and oxygen are known, until now fluorine equivalents had not been reported.
Source: © Gabriel Merino/Cinvestav
Bonding analyses indicate that interactions between fluorine and the peripheral atoms would be significantly electrostatic in the pentaatomic clusters uncovered by this study
The researchers, led by Jorge Barroso and Gabriel Merino from Cinvestav in Mexico, explored the potential energy surfaces of viable pentaatomic clusters with a fluorine atom combined with main group elements, which had 18 valence electrons and charges from -2 to +2. This led to 440 combinations and around 100,000 optimisations.
They only found planar tetracoordinate fluorine systems with substituents from group 13 elements – gallium, indium and thallium. The cavity formed in the centre of four aluminium atoms was not large enough to accommodate a fluorine atom. The size of this cavity is very important, and both indium and thallium formed clusters with sufficiently large cavities, giving FIn

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