TWO ISOMERIC STRUCTURES OF OXOVANADIUM(V) COMPLEXES WITH HYDRAZONE AND 8-HYDROXYQUINOLINE LIGANDS
G.-H. Sheng1, X.-S. Cheng2, Z.-L. You2, H.-L. Zhu1
1Shandong University of Technology, Zibo, P. R. China
2Liaoning Normal University, Dalian, P. R. China
Keywords: hydrazone ligand, 8-hydroxyquinoline, oxovanadium complex, crystal structure, thermal property
Abstract
Two new oxovanadium(V) complexes [VOL
1(HQ)] (1) and [VOL
2(HQ)] (2) are prepared by the reaction of [VO(acac)
2] (where acac = acetylacetonate), 8-hydroxyquinoline (HHQ) with 4-bromo-
N'-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide (H
2L
1) and 2-bromo-
N'-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide (H
2L
2), respectively, in methanol. Crystal and molecular structures of the complexes are determined by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction. Complex 1 crystallizes in the monoclinic space group
P 2
1/
c , with unit cell dimensions
a = 12.5236(13) Å,
b = 22.5260(15) Å,
c = 16.7029(13) Å, b = 90.054(2)°, V = 4712.0(7) Å
3, Z = 8, GOOF = 1.024, R
1 = 0.0586 and
wR
2 = 0.0835. Complex 2 crystallizes in the triclinic space group
P -1, with unit cell dimensions
a = 7.4344(12) Å,
b = 10.8677(16) Å,
c = 14.687(2) Å, α = 85.327(5)°, β = 77.357(5)°, γ = 84.896(5)°,
V = 1150.9(3) Å
3,
Z = 2, GOOF = 1.153,
R
1 = 0.0917 and
wR
2 = 0.3014. The V atoms are in the octahedral coordination. Thermal stability of the complexes is also studied.
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