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In the title compound, C(8)H(9)N(3)S·H(2)O, intra-molecular N-H⋯N hydrogen bonding contributes to the mol-ecular conformation. Water mol-ecules are involved in inter-molecular N-H⋯O and O-H⋯S hydrogen bonds, which link the mol-ecules into ribbons extended along the a axis. Weak inter-molecular N-H⋯S hydrogen bonds link these ribbons into layers parallel to the ab plane with the phenyl rings pointing up and down.

The cation of the title compound, C(36)H(34)N(6)O(2) (2+)·2PF(6) (-), lies across a crystallographic inversion centre. The imidazole and pyridine rings form dihedral angles of 82.28 (5)° and 11.87 (7)°, respectively, with the anthracene ring system. The crystal packing is stabilized by π-π inter-actions between the pyridine ring and the central ring of anthracene, with a ring centroid-centroid distance of 3.684 (3) Å. The PF(6) (-) anion is disordered over three different positions with occupancies of 0.284 (6), 0.354 (8) and 0.362 (9).