catena-Poly[diquinolinium [[diaquacobaltate(II)]-μ-cyclotetraphosphato] hexahydrate]

The cyclotetraphosphate anion, [P4O12]4−, forms the title complex with cobalt(II) and quinolinium, {(C9H8N)2[Co(P4O12)(H2O)2]·6H2O}n. In the complex anion, the CoII ion, lying on an inversion center, is surrounded by four phosphate O atoms and two water molecules in a slightly distorted octahedral geometry. The crystal structure consists of anionic ribbons of formula {[Co(P4O12)(H2O)2]2−}n extending along [100]. A network of O—H...O, N—H...O and C—H...O hydrogen bonds consolidates the crystal packing.