YL-4H-1-BENZOPYRAN-4-ONATO)BIS(PYRIDINE)NICKEL(II)

3-Hydroxyflavone and bipyridyl ligands coordinate to the Ni-II centre in an octahedral arrangement, giving the title complex, [Ni(C15H9O3)(2 )(C5H5N)(2)]. Since the Ni atom lies on a centre of symmetry, all the trans O-Ni-O and N-Ni-N bond angles are 180 degrees; those of O-Ni-N a re close to 90 degrees. The Ni-O(carbonyl), Ni-O(hydroxy) and Ni-N dis tances are 2.067(2), 2.023(2) and 2.180(2) Angstrom, respectively. All the C-C bond distances are normal with values between 1.366 (3) and 1 .406(4) Angstrom, except those which are close to the coordinated C-O bonds: C(1)-C(2), C(2)-C(3) and C(9)-C(10) are 1.457(4), 1.445(3) and 1.462(4) Angstrom, respectively. All rings are almost planar, except t hose involving coordinated O atoms. The dihedral angles between the fl avonato planes and the pyridyl ligands are quite large with values of ca 84 degrees. The angles between the planes in the hydroxyflavone lig and are less than 10 degrees.