8-hydroxyquinoline coordinated vanadium(V) complexes with Schiff bases: Synthesis, characterization, and crystal structures

Two new 8-hydroxyquinoline coordinated vanadium(V) complexes, [VO(L-1)(L')] (I) and [VO(L-2)(L')] (II), where L-1 is the dianionic form of 2-[(2-hydroxyethylimino)methyl]-6-methylphenol (H2L1), L-2 is the dianionic form of N'-(4-oxopentan-2-ylidene)pivalohydrazide (H2L2), L' is the monoanionic form of 8-hydroxyquinoline (HL'), were prepared and characterized by elemental analysis, infrared, UV-Vis and H-1 NMR spectra, and single crystal X-ray diffraction (CIF files CCDC nos. 1012078 (I) and 1012077 (II)). Complex I crystallizes in the monoclinic space group P2(1)/n with unit cell dimensions a = 16.120(1), b = 6.9952(5), c = 16.128(1) , beta = 106.948(2)A degrees, V = 1739.6(2) (3), Z = 4, GOOF = 1.127, R (1) = 0.0464 and wR (2) = 0.1172. Complex II crystallizes in the orthorhombic space group Pna2(1) with unit cell dimensions a = 13.512(2), b = 9.606(1), c = 31.081(4) , V = 4034.3(8) (3), Z = 8, GOOF = 1.044, R (1) = 0.0604 and wR (2) = 0.1038. The V atoms in the complexes are in octahedral coordination. Thermal stability of the complexes was studied.