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From Diamondoid Network to (4,4) Net:  Effect of Ligand Topology on the Supramolecular Structural Diversity

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posted on 03.10.2005, 00:00 by D. Krishna Kumar, D. Amilan Jose, Amitava Das, Parthasarathi Dastidar
While N,N‘-bis(4-pyridyl)urea affords a 5-fold interpenetrated diamondoid network, its positional isomer N,N‘-bis(3-pyridyl)urea gave a net-to-net hydrogen-bonded (4,4) net (square grid network) displaying temperature-dependent anion-induced reversible single-crystal-to-single-crystal disorder−order phase transition, when the ligands are reacted with zinc perchlorate.