1-Phenyl-1H-pyrrole-2,5-dicarboxylic acid derivatives as versatile hydrogen-bonding motifs for the formation of one-, two- and three-dimensional networks in the solid state

A series of 1-phenyl-1H-pyrrole-2,5-dicarboxylic acid derivatives were prepared and their solid state structures were investigated. Small structural changes in the monomeric subunit can lead to the formation of one-dimensional linear ribbons, two-dimensional sheets and three-dimensional networks. In each case a consistent feature of the solid state structures is the formation of bidentate hydrogen bonded contacts between the 2,5-carboxylic acid groups on adjacent pyrrole subunits. The exact nature of the crystal packing is strongly influenced by the substitution on the phenyl ring.