Formation of 24 cooperative hydrogen bonds drives the spontaneous assembly of a rigid bifunctional trimelamine and bis(barbituric acid) to give selectively the [2 × 2] hydrogen-bonded grid, in preference to the corresponding [1 × 1] or polymeric assemblies.
P. Lipkowski, A. Bielejewska, P. Timmerman, D. N. Reinhoudt, H. Kooijman and A. L. Spek, Chem. Commun., 1999, 1311 DOI: 10.1039/A903446C
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