[Cu(C10H8N2)(H2O)3(NO3)]NO3, M(r) = 397.8, triclinic, P1BAR, a = 7.702 (1), b = 9.343 (1), c = 11.275 (1) angstrom, alpha = 99.24 (1), beta = 103.36 (1), gamma = 102.08 (1)-degrees, V = 753.1 angstrom 3, Z = 2, D(m) = 1.75, D(x) = 1.754 g cm-3, lambda(Mo K-alpha) = 0.7107 angstrom, mu = 15.14 cm-1, F(000) = 406, T = 294 K, R = 0.046, wR = 0.052 for 2493 unique observed reflections [F > 3-sigma(F)]. The general features of the structure are the same as those reported earlier [Nakai, Ooi & Kuroya (1977). Bull. Chem. Soc. Jpn, 50, 531-532]. The Cu-O bonds of 1.949 (2) and 1.963 (2) angstrom in the equatorial plane are not equal [1.99 (1) angstrom] as observed in the previous work. The structure is stabilized by a network of hydrogen bonds and van der Waals interactions. The bipyridine rings are involved in stacking interactions with centrosymmetrically related entities.
