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