Abstract
X-ray crystal structures are reported for the copper(II) nitrate complexes of the two isomeric ligands 2,2′-bipyridine N-oxide ( 3) and 1-(2′-pyridyl)-2-pyridone ( 4). This is the first reported use of 4 as a ligand and the first X-ray structure of a metal complex of either ligand. Each complex contains two trans-oriented N,O-bidentate ligands and two trans monodentate nitrato ligands, in a tetragonally distorted octahedral environment. The complex of 3 crystallises with an acetonitrile solvate molecule (monoclinic, a=13.6519(4), b=7.7254(2), c=22.1895(6) Å, β=93.208(1)°, P2 1/ n, Z=4), while that of 4 has a crystallographic centre of inversion (triclinic, a=7.8430(2), b=8.0397(2), c=9.7492(3) Å, α=109.359(1), β=93.232(1), γ=116.187(1)°, P-1, Z=1). Both ligands behave as neutral analogues of the more well-studied anionic ligand 2-(2′pyridyl)phenolate ( 2), with which they are isoelectronic.
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