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In the title complex, [V(C13H15NO3)O(CH3O)(CH3OH)], the VV atom is six-coordinated by a tridentate O,N,O′-donor ligand, derived from the condensation of salicylaldehyde and l-isoleucine, a vanadyl O atom, a methanolate O atom and a methanol O atom in a distorted octahedral geometry. The asymmetric unit contains two complex molecules. In the crystal, intermolecular O—H...O and C—H...O hydrogen bonds connect the molecules into a one-dimensional chain along [100].

In the title complex, [V(C9H6NO)2(CH3O)O], the central VV atom is coordinated by the O atoms from the oxido and methoxo ligands and the N and O atoms of two bis-chelating quinolin-8-olate ligands, forming a distorted octahedral environment. In the crystal structure, weak intermolecular C—H...O hydrogen bonds connect molecules into centrosymmetric dimers which are, in turn, linked by weak C—H...π interactions into chains along the b axis.

In the title complex, [Cu(C21H14NO)2], the CuII atom, lying on an inversion center, is coordinated by two bidentate 1-(2-naphthyliminomethyl)-2-naphtholate ligands in a trans arrangement, forming a slightly distorted square-planar coordination geometry. The mean planes of two naphthyl systems of the ligand make a dihedral angle of 40.32 (11)°.