Ck. Lam et Tcw. Mak, Rhodizonate and croconate dianions as divergent hydrogen-bond acceptors inthe self-assembly of supramolecular structures, CHEM COMMUN, (17), 2001, pp. 1568-1569
The C5O52- and relatively unstable C6O62- dianions, each serving as a hub f
or binding with a set of convergent NH donor groups of four phenylurea mole
cules, have been generated in situ and stabilized in nearly isostructural h
ydrogen-bonded host lattices.