which has been characterized by standard spectroscopic and micro-analytical methods (Scheme 1 and Figure ). [2-K(C7H8)]2 can be shown by X-ray crystallography to feature a centrosymmetric structure in which two [(NON)Al] units are bridged by a [C4O4] fragment and two K + counterions (which each interact with the p system of a Dipp group of one NON ligand and an additional toluene molecule; Figure ).