CRYSTAL-STRUCTURES OF BIS(DI-2-PYRIDYLAMINE)(ACETATO)COPPER(II) NITRATE AND BIS(DI-2-PYRIDYLAMINE)(FORMATO)COPPER(II) TETRAFLUOROBORATE

Bis(di-2-bipyridylamine)(acetato)copper(II) nitrate, [Cu(C10H9N3)2(C2H3O2)][NO3], (I), M(r) = 526.89, and bis(di-2-bipyridylamine)(formato)copper(II) tetrafluoroborate, [Cu(C10H9N3)2(CHO2)][BF4], (II), M(r) = 537.64, both crystallize in the monoclinic space group P2(1)/c. (I), a = 13.216 (3), b = 8.068 (2), c = 22.161 (4) angstrom, beta = 92.01 (3)-degrees, V = 2361.50 angstrom 3, Z = 4, D(m)(flotation) = 1.50 (1), D(x) = 1.48 Mg m-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 0.926 mm-1, T = 298 K, F(000) = 1084, R = 0.048 for 1887 observed reflections. (II), a = 13.571 (2), b = 7.687 (1), c = 22.362 (3) angstrom, beta = 94.99 (2)-degrees, V = 2323.97 angstrom 3, Z = 4, D(m)(flotation) = 1.52 (1), D(x) = 1.54 Mg m-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 0.960 mm-1, T = 298, F(000) = 1092, R = 0.051 for 1660 observed reflections. Both structures involve a cis-octahedral CuN4O2 chromophore, but with very asymmetrically coordinated OXO groups, DELTA-O = {[Cu-O(2)] - [Cu-O(1)]} = 0.643 (8) and 0.873 (4) angstrom, for (I) and (II), respectively. Both structures are best described as involving a square-pyramidal cis-distorted octahedral (4 + 1 + 1*) CuN4OO' chromophore, but with significantly different angular distortions.