The structures of bis(2,2'-bipyridyl)mononitritocopper(II) tetrafluoroborate and bis(2,2'-bipyridyl)mononitritozinc(II) nitrate

Abstract

host lattice, the crystal structure of [Zn(bpy) 2(ONO)]NO 3 (2) has also been determined. The structures of bis(2,2'-bipyridyl)mononitritocopper(II) tetrafluoroborate [Cu(C10HaN2)2(ONO)]BF 4, C20H16CuNsO+.BF4 (1), and bis(2,2'-bipyridyl)mononitritozinc(II) nitrate [Zn(C~0HsN2)2(ONO)]NO 3, C20H16NsO2Zn+.NO3 (2), have been determined by X-ray analysis. Both complexes crystallize in the monoclinic space group P2~/n with, for (1), a = 10.839 (3), b = 12.367 (3), c = 16.219 (3)A, fl = 105.25 (5) °, U = 2097.5 :k 3, Z = 4, R = 0.0468 (R w = 0.0566) for 2769 unique reflections and, for (2), a = 11.27 (5), b = 11.93 (5), c = 15.49 (6) A, fl = 101.2 (2) ° , U = 2042.7A 3, Z = 4, R = 0.0953 (R w = 0.1033) for 2083 unique reflections. Both complexes involve an MN40 2 chromophore but while (1) has a (4+ 1 + l*)-type coordination involving a trigonal-bipyramidal stereochemistry with a squarepyramidal distortion with an elongation along one of the in-plane Cu-N directions and an off-the-axis sixth O ligand, (2) involves a cis-distorted ZnN402 chromophore stereochemistry. The two structures may be related by a linear combination of the components of the E mode of vibration of the parent trigonaloctahedral tris(chelate)metal(II) structure.