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The Co atom in the title compound, [Co(C 14 H 12 N 6 )(H 2 O) 3 ]C 4 H 2 O 4 , has a  mer -CoN 3 O 3  octa­hedral coordination arising from the tridentate  N2 , N4 -di-2-pyridylpyrimidine-2,4-diamine (tpda) ligand and three coordinated water mol­ecules. The asymmetric unit contains two fumarate half-anions, both completed by inversion symmetry. A network of N—H⋯O and O—H⋯O hydrogen bonds leads to a three-dimensional network in the crystal structure.

Triaqua(N2,N4-di-2-pyridylpyrimidine-2,4-diamine)cobalt(II) fumarate

Triaqua(N²,N⁴-di-2-pyridylpyrimidine-2,4-diamine)cobalt(II) fumarate