Ammonia detection by using flexible Lewis acidic sites in luminescent porous frameworks constructed from a bipyridinium derivative.

A flexible bipyridinium ligand with Lewis acidic sites has been introduced into two isomorphous metal–organic frameworks to yield luminescent porous materials with subtriangular pore windows, which exhibit sensitive fluorescent response for ammonia molecules and can be proved at the molecular level by Raman spectroscopy. [ABSTRACT FROM AUTHOR]