Hydrogen-bond network in isomeric phenylenedipropynoic acids and their DABCO salts. Water mediated helical hydrogen bond motifs†
Abstract
The crystal structures of isomeric phenylenedipropynoic acids (PPA) are reported. 1,2-PPA shows an intra- and intermolecular hydrogen bonded 2D layered sheet structure. 1,4-PPA also has a 2D layered sheet structure. However the hydrogen bond is mediated by