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An explosive way to make porous organic networks

By Paul Grad |

A team from Ulsan National Institute of Science and Technology (Ulsan, South Korea; www.unist.ac.kr), led by professor Jong-Beom Baek has introduced a synthetic methodology for fabricating a three-dimensional porous organic network with a high specific surface area via a solid-state explosion of organic single crystals containing primer molecules. The method involves the Bergman reaction (cyclo-aromatization) of 2,3,6,7, 14, 15-hexaethynyl-9,10-dihydro-9,10-{1,2}benzenoanthracene (HEA), which is a self-polymerizable trifunctional (M3) building block with three enedyne groups (containing a double bond and two triple bonds). X-ray diffraction suggested that two acetone molecules and one water molecule are regularly positioned in the HEA crystal lattice. The acetone and water molecules play a role as primer to trigger explosion. Solid-organic materials can easily melt when heat is applied. However, the newly-developed HEA single crystals trigger explosive Bergman reactions and quickly changes to 3-D porous materials when heat is applied, without the presence of solvents and catalysts. The polyHEA obtained is a porous material with specific surface area of 1,176 m2/g displaying unusual sorption capacity for CO2. The team’s method could…
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