fac-Tri­aqua­(1,10-phenanthroline-κ(2) N,N′)(sulfato-κO)cobalt(II): crystal structure, Hirshfeld surface analysis and computational study

The Co(II) atom in the title complex, [Co(SO(4))(C(12)H(8)N(2))(H(2)O)(3)] (or C(12)H(14)CoN(2)O(7)S), is octa­hedrally coordinated within a cis-N(2)O(4) donor set defined by the chelating N-donors of the 1,10-phenanthroline ligand, sulfate-O and three aqua-O atoms, the latter occupying an octa­hedral face. In the crystal, supra­molecular layers lying parallel to (110) are sustained by aqua-O—H⋯O(sulfate) hydrogen bonding. The layers stack along the c-axis direction with the closest directional inter­action between them being a weak phenanthroline-C—H⋯O(sulfate) contact. There are four significant types of contact contributing to the calculated Hirshfeld surface: at 44.5%, the major contribution comes from O—H⋯O contacts followed by H⋯H (28.6%), H⋯C/C⋯H (19.5%) and C⋯C (5.7%) contacts. The dominance of the electrostatic potential force in the mol­ecular packing is also evident in the calculated energy frameworks. The title complex is isostructural with its manganese, zinc and cadmium containing analogues and isomeric with its mer-tri­aqua analogue.