Pyridinium CH⋯anion and π-stacking interactions in modular tripodal anion binding hosts: ATP binding and solid-state chiral induction

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Abstract
The preparation of two new tripodal ‘pinwheel’ type anion hosts based on a triethylbenzene core and bipyridinium or ethylnicotinium arms is reported. The new materials bind anions via CHanion interactions. Complexes with Br− and PF6 − have been characterised by X-ray crystallography as both solvates in a pure form. In the bipyridinium host CHF interactions to PF6 − induce a chiral C3 symmetric conformation that is disrupted in the hydrate. The compound is also selective for ATP2− in aqueous acetonitrile.