MINOPYRIMIDINE-N-1)TRIAQUACOBALT(II)]DIHYDRATE(1), INOPYRIMIDINE-N-1)DIAQUANICKEL(II)-MU-SULFATO-O-O' 2-AMINOPYRIMIDINE](2), (2-AMINOPYRIMIDINE-N-1)PENTAAQUANICKEL(II) SULFATE 2-AMINO-PYRIMIDINE(3) AND AMINOPYRIMIDINE-N-1)AQUACOPPER(II)-MU-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 diffractio n. Co-II forms a dimeric complex, [Co(SO4)(C4H5N3)(H2O)(3)](2).2H(2)O, (1), and Ni-II and Cu-II form polymeric complexes, [Ni(SO4)(C4H5N3)(2 )(H2O)(2)].C4H5N3, (2), and [Cu(SO4)-(C4H5N3)(2)(H2O)].2H(2)O, (4). Th e sulfate ion acts as a bridging moiety between the metal atoms in the se three complexes. The Ni-II ion also forms an ionic complex, [Ni(C4H 5N3)(H2O)(5)]SO4.C4H5N3, (3). The coordination of 2-aminopyrimidine to the metal is always through the ring N atom.