The title compound, [VO(C10H6NO2)2(H2O)]2·C2H5OH, contains six‐coordinate VIV atoms. The central VIV atom in each of the two crystallographically independent mol­ecules has a distorted octahedral coordination geometry, involving O atoms of the oxo and aqua ligands, together with two O and two N atoms of two organic ligands.

Key indicatorsSingle-crystal X-ray study T = 296 K Mean '(C±C) = 0.004 A Ê R factor = 0.026 wR factor = 0.071 Data-to-parameter ratio = 16.6For details of how these key indicators were automatically derived from the article, see

In the three title complexes, namely (2,2'-biquinoline-kappa(2)N,N')dichloropalladium(II), [PdCl2(C18H12N2)], (I), and the corresponding copper(II), [CuCl2(C18H12N2)], (II), and zinc(II) complexes, [ZnCl2(C18H12N2)], (III), each metal atom is four-coordinate and bonded by two N atoms of a 2,2'-biquinoline molecule and two Cl atoms. The Pd(II) atom has a distorted cis-square-planar coordination geometry, whereas the Cu(II) and Zn(II) atoms both have a distorted tetrahedral geometry. The dihedral angles between the N-M-N and Cl-M-Cl planes are 14.53 (13), 65.42 (15) and 85.19 (9) degrees for (I), (II) and (III), respectively. The structure of (II) has twofold imposed symmetry.

In the title compounds, [Pd(C(10)H(6)O(2))(C(10)H(8)N(2))], (I), and [Pd(C(10)H(6)O(2))(C(18)H(12)N(2))], (II), each Pd(II) atom has a similar distorted cis-planar four-coordination geometry involving two O atoms of the 2,3-naphthalenediolate dianion and two N atoms of the 2,2'-bipyridine or 2,2'-biquinoline ligand. The overall structure of (I) is essentially planar, but that of (II) is not, as a result of intramolecular overcrowding leading to bowing of the biquinoline ligand.

Key indicatorsSingle-crystal X-ray study T = 296 K Mean '(C±C) = 0.008 A Ê R factor = 0.049 wR factor = 0.170 Data-to-parameter ratio = 15.8For details of how these key indicators were automatically derived from the article, see