Anion-controlled assemblies of C–H⋯O hydrogen bonded grid, stair or bilayer structures by L-shaped pyridinium salts†
Abstract
A series of 1-carbamoylmethyl-3-ethoxycarbonylmethylpyridinium salts with different anions (PF6− (1), BF4− (2), OTf− (3) and Br− (4)) have been synthesized and characterized by