Abstract
In the title compound, [Co(C
12
H
8
N
2
)
3
][ReO
4
]
2
·H
2
O, the Co
II
atom is coordinated by three 1,10-phenanthroline ligands in a distorted octahedral arrangement. In the crystal, the components are linked by O—H⋯O, C—H⋯O and aromatic π–π stacking [shortest centroid–centroid separation = 3.659 (5) Å] interactions.