Morshedi, MahbodWillis, Anthony C.White, Nicholas G.2016-09-052016-09-051466-8033http://hdl.handle.net/1885/108626Hexahydroxytriphenylene (HHTP) forms 2D frameworks through O–H⋯anion hydrogen bonds with a range of anions. In all cases, 1 : 1 co-crystals of HHTP and tetraalkylammonium·anion salts are obtained, which have a layered 2D structure. When HSO₄⁻ was used as anion, an unprecedented methylation reaction was observed giving crystals containing the methylsulfate anion (MeOSO₃⁻).© The Royal Society of Chemistry 2016201610.1039/C6CE00297H