Supramolecular motifs in s-block metal bound sulfonated monoazo dyes

The solid-state structures of sodium and calcium complexes of the simple su lfonated azo dyes ([O3SC6H4NNC6H3RR'](-) R=H, R'=OH or NH2; R=OH, R'=OH) fo rm a series of supramolecular arrays, with one-, two- and three-dimensional structural motifs and with inorganic coordination networks supporting orga nic channels. The dominant inorganic networks are formed via coordination t o sulfonate groups, water molecules and the amine units, whilst the availab le hydroxyl groups form only hydrogen-bonds. The nature of the networks is dependent on the metal ion used with sodium ions forming close linked sheet s, chains and cages reminiscent of many inorganic minerals whilst the calci um ions adopt ring-ladder structures comparable to those found in s-block a mide chemistry.