The structures of acetatobis(2,2'-bipyridyl)copper(II) perchlorate monohydrate and tetrafluoroborate – cation distortion isomers

Abstract

The structures of acetatobis(2,2'-bipyridyl)copper(II) perchlorate monohydrate, [Cu(C1oHsN2)2(C2H302)] -C104.H20, C22H19CuN40+.C104.H20 (I), and tetrafluoroborate (II) have been determined by X-ray analysis. (I) crystallizes in the triclinic space group. Pi with a = 8.338 (2), b = 9.660 (2), e = 14.912 (3)

Crystal structures of bis(di-2-pyridylamine)(acetato)copper(II) nitrate and bis(di-2-pyridylamine)(formato)copper(II) tetrafluoroborate

“…The mean C---O distance of the acetate ligand, 1.26(2)/~, agrees with the reported value, 1-26/k (Oldham, 1968;Hathaway, Ray, Kennedy, O'Brien & Murphy, 1980;Wells, 1984). The separate C--O distances of 1.236 (8) and subtends an angle of 50-3 (5) ° at the Cu atom.…”

catena-Acetato(di-2-pyridylamine)-μ-perchlorato-copper(II) monohydrate

“…The acetate group is planar, and consistent with the near symmetrical bidentate coordination to the Cu atom, the C(ll)-O(1) and C(11)-O(2) distances of 1.257 (6) and 1.261 (5)/~ not being significantly different. The symmetrical coordination of the acetate group (Oldham, 1968) is unique in the coordinating role of this ligand to Cu, which usually involves very asymmetric bonding (Hathaway et al, 1980), with Cu-O distances of 2.00 and 2.5-2.9 A, respectively, a difference in coordination of the acetate O atoms that is not reflected in a difference in the C-O bond distances. In addition the mean C(ll)-O distance in (1) of 1.259/~ is not very different from the mean C-O distance of 1.25 + 0.02 A in the unsymmetrically bonded acetate groups of [Cu(bpy)2(CH3CO2)](CIO4).2H20 and [Cu(bpy)2(CH3CO2)I(BF 4) (bpy = 2,2'-bipyridyl), (Hathaway et al, 1980), notwithstanding the different bonding role of the acetate in these three complexes.…”

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

“…Consequently, the asymmetric bonding role of the chelate nitrito group in (1) is reflected in the asymmetry of the N-O distances of the nitrite group, and implies that, despite the relative shortness of the Cu-O(2) distance of 2.463 A, the bonding at this distance will be less than the bonding of Cu-O(1) at 2.117 A. This situation contrasts with that in the bonding of acetate (Hathaway, Ray, Kennedy, O'Brien & Murphy, 1980) and formate (Fitzgerald & Hathaway, 1980) ligands in these [Cu(bpy)2(OXO)]Y-type complexes.…”