Bis­[bis(2,2′‐bi­pyridine‐κ2N,N′)(nitrato‐κ2O,O′)­cobalt(II)] molybdate heptahydrate

The crystal structure of the title compound, [Co(NO3)(bipy)2]2[MoO4]·7H2O (bipy is 2,2′‐bi­pyridine, C10H8N2), contains the isomers Δ and Λ of the cation [Co(NO3)(bipy)2]+, self‐assembled through complementary π–π, C—H⋯π and C—H⋯O interactions, leading to an intricate two‐dimensional array. The final three‐dimensional network is sustained via extensive hydrogen bonding among the cations, uncoordinated water mol­ecules and molybdate anions, which are accommodated in between adjacent cationic two‐dimensional arrays. In the cations, the metal centres adopt a distorted octahedral geometry due to the coordination of the N atoms of two bipy mol­ecules and one bidentate nitrate ligand.