The mol-ecule of the title compound, [CuNa(C(18)H(18)N(2)O(4))(C(2)N(3))(H(2)O)], is almost planar, the maximum deviation from the mol-ecular plane being 0.48 (4) Å. The coordination environment of the Cu(2+) ion is distorted square-planar and it is N(2)O(2)-chelated by the Schiff base ligand. The Na(+) cation has a distorted octahedral environment defined by the four O atoms of the 6,6'-dimeth...

The secondary interaction between a polarized chalcogen atom and different Lewis bases, either anionic or neutral, has been studied by charge displacement analysis. Using charge displacement analysis, the charge rearrangement in the adduct upon the formation of the interaction has been quantified and described in great detail. By comparing the theoretical results with the experimental associati...

The title Schiff base, C(21)H(26)N(2)O(2), contains two intra-molecular O-H⋯N hydrogen bonds between the hydroxyl groups and the nearest imine N atoms, each leading to a six-membered ring. Weak C-H⋯O hydrogen bonds result in a ladder network running along the a axis. In addition, inter-molecular C-H⋯π inter-actions serve to stabilize the extended structure.

In the title compound, C(15)H(12)BrClN(2)O(4), the configuration of the C=N double bond can be described as trans. The two aromatic rings in this Schiff base are nearly coplanar with a dihedral angle between their mean planes of 15.4 (2)°. In the crystal, molecules are linked via O-H⋯N and C-H⋯O interactions.

The title compound, C(15)H(13)BrClNO, is a Schiff base derived from the condensation of equimolar quanti-ties of 3-bromo-5-chloro-salicylaldehyde and 1-phenyl-ethanamine. The structure displays a trans configuration with respect to the imine C=N double bond. The N atom is also involved in an intra-molecular O-H-N hydrogen bond, which stabilizes the configuration of the compound.

In the title complex, [Zn(C(13)H(12)NO(3))(2)], the Zn(II) ion is located on a twofold rotation axis and is coordinated by two bidentate Schiff base ligands in a distorted tetra-hedral environment. The complex mol-ecules are stacked in columns along the b axis through C-H⋯O hydrogen bonds.

The title compound, C(26)H(21)N(3)O(2), is an unsymmetrical tetra-dentate Schiff base ligand. The hydr-oxy group forms an intra-molecular O-H⋯N hydrogen bond with an adjacent N atom. An inter-molecular N-H⋯O hydrogen bond creates centrosymmetric dimers in the crystal packing.

In the title complex, [CuLu(C(19)H(20)N(2)O(4))(NO(3))(3)]·CH(3)COCH(3), the Cu(II) ion is four-coordinated in a square-planar geometry by two O atoms and two N atoms from the deprotonated Schiff base. The Lu(III) ion is ten-coordinate, chelated by three nitrate groups and linked to the four O atoms of the deprotonated Schiff base. A mol-ecule of acetone is present as a solvate.

The azomethine double-bond in the title Schiff base, C(20)H(22)N(4)O, has an E-configuration. The aromatic ring of the benzyl-idene portion (r.m.s. deviation 0.011 Å) and the five-membered pyrazolyl ring (r.m.s. deviation 0.033 Å) form a dihedral angle of 19.0 (1)°. The phenyl substituent is twisted by 55.0 (1)° with respect to the five-membered ring.

The V(IV) atom in the title complex, [V(C(19)H(17)N(3)O(2)S)O], is coordinated by two N and two O atoms of the dianionic tetra-dentate Schiff base ligand and the terminal oxide O atom. The N(2)O(3) donor set defines a square-pyramidal coordination geometry with the oxide O atom in the apical site. Some buckling in the tetra-dentate ligand is indicated by the dihedral angle of 17.92 (19)° betwee...