Synthesis, crystal structures and catalytic activity of oxidovanadium(V) complexes with tridentate ONO aroylhydrazone ligands

Abstract

Two oxidovanadium(V) complexes, [VOL¹(OEt)] (1) and [V₂O₂(L²)₂(OEt)₂] (2), where L¹ and L² are the anions of 2-amino-N′-(2-hydroxybenzylidene)benzohydrazide (H₂L¹) and N′-(2-hydroxybenzylidene)-4-hydroxybenzohydrazide (H₂L²), respectively, have been synthesized and characterized by elemental analysis, infrared and electronic spectra, and ¹H NMR spectra. Structures of the complexes were further confirmed by single-crystal X-ray determination. The V atom in the mononuclear complex 1 is in square pyramidal coordination, and those in the dinuclear complex 2 are in octahedral coordination. Both aroylhydrazone ligands coordinate to the V atoms through the phenolate O, imino N, and enolate O atoms. The ethanol ligand in complex 1 is in terminal coordination mode, while that in complex 2 is in bridging coordination mode. The complexes function as effective olefin epoxidation catalysts with hydrogen peroxide as terminal oxidant and sodium hydrogen carbonate as a co-catalyst.

Keywords:

• Aroylhydrazone
• vanadium complex
• catalytic activity
• crystal structure

Supplementary material

CCDC reference numbers 1851433 (1) and 1851434 (2) contain the supplementary crystallographic data for this article. These data can be obtained free of charge at http://www.ccdc.cam.ac.uk, or from Cambridge Crystallographic Data Center, 12 Union Road, Cambridge CB2 1EZ, UK; Fax: [phone]; Email: [email protected].

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by the Fundamental Research Funds in Heilongjiang Provincial Universities (Project No. 135409307).