Hydrogen bonding adducts of octamolybdate anions containing coordinately bound pyridiniumoxides

The reaction of hepatmolybdate with 3-hydroxypyridine and 4-hydroxypyridine in water resulted in the crystalline materials of octamolybdates. The crystal structures reveal that pyridinium oxide moieties are coordinately linked to Mo8O26 clusters. These clusters joined together via N-H⋯O hydrogen bonds to form linear ribbons which are further joined by H2O molecules to form 2D-layers.