Framework Morphology

Mesocrystal morphogenesis

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Science  09 Mar 2018:
Vol. 359, Issue 6380, pp. 1115-1116
DOI: 10.1126/science.359.6380.1115-g

Control of the formation of mesoscale crystals of metalorganic framework (MOF) compounds can offer ways to control their reactivity and sorption properties and create more elaborate structures. Hwang et al. show that a copolymer with two hydrophilic blocks—polyethylene oxide and polymethylmethacrylate—modulates the crystal formation of a MOF in which zinc cations and bdc (benzene-1,4-dicarboxylic acid) linkers form two-dimensional sheets connected by a second ligand that act as pillars. The copolymer kinetically favors metastable hexagonal crystal polymorphs. After partial removal of the copolymer with methanol soaking, the crystals transform into more stable tetragonal crystals.

J. Am. Chem. Soc. 10.1021/jacs7b12633 (2018).

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