The title compound, mu-aqua-1:2 kappa(2)O-pentaaqua-1 kappa(2)O,2 kappa(3)O
-mu-3,6-bis(6-methyl-2-pyridyl)pyridazine-1 kappa(2) N-1,N-6 :2 kappa(2)N(2
),N-3-chloro-1 kappa Cl-dinickel(II) trichloride trihydrate, [Ni2Cl(C16H14N
4)(H2O)(6)]Cl-3. 3H(2)O, consists of two Ni-II atoms, a 3,6-bis(6-methyl-2-
pyridyl)pyridazine molecule, four Cl atoms and nine water molecules. The tw
o Ni atoms are octahedrally coordinated by N and Cl atoms, and by water mol
ecules, and the three six-membered rings, a pyridazine and two picolines, a
re planar to within 0.181 (3) Angstrom. The crystal structure is stabilized
by an intra- and intermolecular hydrogen-bonding scheme involving water-wa
ter and water-chlorine interactions.