Tris(1,10-phenanthroline)nickel(II) squarate octa­hydrate

In the title mononuclear [Ni(phen)₃]sq·8H₂O complex [phen is 1,10-phenanthroline (C₁₂H₈N₂) and sq is squarate (C₄O₄²⁻)], the Ni^II ion has a distorted octa­hedral coordination geometry composed of six N atoms from three bidentate chelating phen ligands. An extensive three-dimensional network of O_water—H...O, O_water—H...O_water and C—H...O hydrogen-bonding inter­actions is responsible for crystal stabilization.