Anion recognition by new acyclic quaternary polybipyridinium receptors
Abstract
New acyclic quaternary polybipyridinium receptors L1–L4 containing 5,5′- and 4,4′-disubstituted-N,N′-dimethyl-2,2′-bipyridinium are prepared and shown by preliminary 1H and 13C NMR titration investigations to coordinate chloride and bromide anionic guest species.