Hydrogen-bonding chain and dimer motifs in pyridinium and morpholinium hydrogen oxalate salts

Abstract

Three compounds consisting of pyridinium or morpholinium hydrogen oxalates each display different hydrogen oxalate hydrogen-bonding motifs, resulting in chains for 4-(di­methyl­amino)­pyridinium hydrogen oxalate 0.22-hydrate, dimers for 4-tert-butyl­pyridinium hydrogen oxalate and chains for morpholinium hydrogen oxalate.