ISSN 10703284, Russian Journal of Coordination Chemistry, 2015, Vol. 41, No. 12, pp. 792–797. © Pleiades Publishing, Ltd., 2015.
Hydrazones are very popular ligands because they
efficiently act as chelates generating a rich variety of co
ordination compounds, ranging from mononuclear to
polynuclear species. In recent years, a great number of
complexes with hydrazones have been reported, show
ing interesting structures and excellent properties, such
as catalytic [1–3], magnetic [4–6], and biological [7–
9], etc. Vanadium complexes with hydrazones are often
described as good epoxidation catalysts [10–13]. The
method is mild and is an environment friendly pro
cess. As a further study of the catalytic epoxidation of
vanadium complexes, in this study, the synthesis,
characterization, crystal structure and catalytic epoxi
dation property of a new oxovanadium(V) complex,
), derived from the benzohydra
zone ligand N'(3bromo5chloro2hydroxyben
L) and ben
zohydroxamic acid (HL
), are reported.
The article is published in the original.
Material and measurements.
All chemicals and sol
vents used for the synthesis are of analytical grade. 3Bro
de, benzohydroxamic acid, VO(Fcac)
, styrene and sty
rene oxide were purchased from Aldrich and used with
out further purification. Iodosylbenzene (PhIO) was pre
pared by the hydrolysis of iodobenzene diacetate. Infra
red spectra were recorded as KBr pellets on a JASCO
FTIR 4100 spectrophotometer. Elemental analyses (C,
H, N) were carried out using a Perkin Elmer 2400 II ele
mental analyser. Electronic spectra were recorded on a
Perkin Elmer Lambda 40 (UV/Vis) spectrometer in ace
analysis was performed with Agilent 6890N
Network GC systems. Molar conductivity of complex
in acetonitrile was measured with a DDS11A molar
Synthesis of H
The yellow crystalline product of
the benzohydrazone ligand H
L was prepared by reaction
of equimolar quantities of 3bromo5chlorosalicylalde
hyde (1.0 mmol, 0.235 g) with 2hydroxybenzohydrazide
(1.0 mmol, 0.152 g) in methanol and subsequent evapo
ration of the solvent. The yield was 91%.
IR data (KBr;
): 1647 s
(C=O), 1614 s
(C=N). UV (
, L mol
(2.89), 295 (4.05), 308 (3.31), 340 (2.71).
anal. calcd., %: C, 45.5; H, 2.7; N, 7.6.
Found, %: C, 45.3; H, 2.8; N, 7.7.
Synthesis, Crystal Structure, and Catalytic Epoxidation
of a New Oxovanadium(V) Complex with Benzohydrazone
and Benzohydroxamate MixedLigands
F. Y. Wei
Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji, 721013 P.R. China
Received March 23, 2015
Synthesis, characterization, and catalytic properties for styrene epoxidation of a new oxovanadi
um(V) complex [VOLL
) derived from N'(3bromo5chloro2hydroxybenzylidene)2hy
L) and benzohydroxamic acid (HL') are reported. Complex
was characterized by
elemental analyses, IR, UVVis spectra and molar conductivity. Single crystal Xray structure of complex
has been determined (CIF file CCDC no. 1034615). The V atom in the structure is in an octahedral coordi
nation. In the crystal structure, molecules are linked through intermolecular O–H
Br and N–
O hydrogen bonds, to form 2D layers. Catalytic property for epoxidation of styrene by the complex using
PhIO and NaOCl as oxidant has been studied.