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Controlling the crystallization of porous organic cages: molecular analogs of isoreticular frameworks using shape-specific directing solvents

DOI: 10.1021/ja409594s DOI Help

Authors: Tom Hasell (University of Liverpool) , Jamie L. Culshaw (University of Liverpool) , Sam Chong (University of Liverpool) , Marc Schmidtmann (University of Liverpool) , Marc Little (University of Leeds) , Kim E Jelfs (University of Liverpool) , Edward O Pyzer-knapp (University of Cambridge,) , Hilary Shepherd (University of Liverpool) , Dave Adams (University of Liverpool) , Graeme M. Day (University of Southampton) , Andrew I. Cooper (University of Liverpool)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Chemical Society , VOL 136 (4)

State: Published (Approved)
Published: January 2014
Diamond Proposal Number(s): 7040 , 8728

Abstract: Small structural changes in organic molecules can have a large influence on solid-state crystal packing, and this often thwarts attempts to produce isostructural series of crystalline solids. For metal–organic frameworks and covalent organic frameworks, this has been addressed by using strong, directional intermolecular bonding to create families of isoreticular solids. Here, we show that an organic directing solvent, 1,4-dioxane, has a dominant effect on the lattice energy for a series of organic cage molecules. Inclusion of dioxane directs the crystal packing for these cages away from their lowest-energy polymorphs to form isostructural, 3-dimensional diamondoid pore channels. This is a unique function of the size, chemical function, and geometry of 1,4-dioxane, and hence, a noncovalent auxiliary interaction assumes the role of directional coordination bonding or covalent bonding in extended crystalline frameworks. For a new cage, CC13, a dual, interpenetrating pore structure is formed that doubles the gas uptake and the surface area in the resulting dioxane-directed crystals.

Journal Keywords: Porous organic cages; covalent organic frameworks; metal-organic frameworks; crystalline; amorphous; microporous; polymorph

Subject Areas: Chemistry, Materials

Instruments: I11-High Resolution Powder Diffraction , I19-Small Molecule Single Crystal Diffraction

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