Flexible Ketone-bridged organic porous nanospheres: Promoting porosity utilizing intramolecular hydrogen-bonding effects for effective gas separation

Ketone-bridged nanoporous organic polymers (NOPs) were readily prepared through one-pot Friedel-Crafts acylation. The NOPs integrated with carboxyl groups in the adjacent positions of ketone exhibit significantly higher porosity than the carbonyl-free category, which may be ascribed to the H-bonding interaction between the carbonyl and the carboxyl group.