Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1123, Issue -, Pages 367-374Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2016.06.038
Keywords
Oxidovanadium(IV); Schiff base; X-ray crystallography; Catalysis; Epoxidation
Categories
Funding
- Damghan University (DU)
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The five coordinated vanadium(IV) Schiff base complexes of VOL1 (1) and VOL2 (2), HL1 = 24(E)-[2-bromoethypiminolmethy1}-2- naphthol, HL2 = 24(E)-[2-chloroethyl)iminolmethyl)-2- naphthol, have been synthesized and they were characterized by using single-crystal X-ray crystallography, elemental analysis (CHN) and FT-IR spectroscopy. Crystal structure determination of these complexes shows that the Schiff base ligands (L-1 and L-2) act as bidentate ligands with two phenolato oxygen atoms and two imine nitrogen atoms in the trans geometry. The coordination geometry around the vanadium(IV) is distorted square pyramidal in which vanadium(IV) is coordinated by two nitrogen and two oxygen atoms of two independent ligands in the basal plane and by one oxygen atom in the apical position. The catalytic activity of the Schiff base complexes of 1 and 2 in the epoxidation of alkenes were investigated using different reaction parameters such as solvent effect, oxidant, alkene/oxidant ratio and the catalyst amount. The results showed that in the presence of TBHP as oxidant in 1: 4 and 1:3 ratio of the cyclooctene/oxidant ratio, high epoxide yield was obtained for 1 (76%) and 2 (80%) with TON(= mole of substrate/mole of catalyst) of 27 and 28.5, respectively, in epoxidation of cyclooctene. (C) 2016 Elsevier B.V. All rights reserved.
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