Di-μ-sulfato-O:O'-bis[(2-aminopyrimidine-N¹)triaquacobalt(II)] Dihydrate (1), catena-Poly[bis(2-aminopyrimidine-N¹)diaquanickel(II)-μ-sulfato-O:O' 2-Aminopyrimidine] (2), (2-Aminopyrimidine-N¹)pentaaquanickel(II) Sulfate 2-Aminopyrimidine (3) and catena-Poly[bis(2-aminopyrimidine-N¹)aquacopper(ii)-μ-sulfato-O:O' Dihydrate] (4)

2-Aminopyrimidine complexes of aqueous Co^II, Ni^II and Cu^II sulfate have been prepared and their structures determined by X-ray diffraction. Co^II forms a dimeric complex, [Co(SO₄)(C₄H₅N₃)(H₂O)₃]₂.2H₂O (1), and Ni^II and Cu^II form polymeric complexes, [NiSO₄(C₄H₅N₃)₂(H₂O)₂].C₄H₅N₃ (2) and [CuSO₄(C₄H₅N₃)₂(H₂O)].2H₂O (4). The sulfato ion acts as a bridging moiety between the metal atoms in these three complexes. The Ni^II ion also forms an ionic complex, [Ni(C₄H₅N₃)(H₂O)₅]SO₄.C₄H₅N₃ (3), in which the coordination of 2-aminopyrimidine to the metal is always through the ring N atom.

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