Molecular Materials

Electrochemically driven box-weaving

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Science  22 Sep 2017:
Vol. 357, Issue 6357, pp. 1251-1252
DOI: 10.1126/science.357.6357.1251-c

Woven textures within a molecular material can potentially affect strength and toughness. Champsaur et al. describe the electrochemical crystallization of polymer stands that adopt a box-weave structure through electrostatic assembly. Trans-substituted Co6Se8(PEt3)4(CNC6H4NC)2 (where Et is ethyl) oxidizes to form polymer strands through isonitrile-cobalt bond formation. These cationic strands assemble electrostatically with a Lundqvist dianion, Mo6O192−. The tetragonal symmetry of the dianion acts as a template to impose the box weave. Polymer strands cross above or below one another within each two-dimensional sheet, as shown by x-ray diffraction of a single crystal annealed to 150°C.

J. Am. Chem. Soc. 10.1021/jacs.7b07279 (2017).

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