Hydrogen Bond-Induced Assembly and Crystal Structures of Two Oxovanadium Complexes with Schiff Bases

Abstract

Two new oxovanadium complexes, [VOL¹(acac)] (1) and [VO₂L²]₂ (2), where acac is acetylacetone, and L¹ and L² are the deprotonated forms of 2-bromo-4-chloro-6-[(2-dimethylaminoethylimino)methyl]phenol (HL¹) and 2-bromo-4-chloro-6-[(2-methylaminoethylimino)methyl]phenol (HL²), respectively, have been synthesized and characterized by infrared (IR) spectra and single-crystal x-ray diffraction. Complex (1) is a mononuclear oxovanadium(IV) complex. Complex (2) is a centrosymmetric dinuclear dioxovanadium(V) complex, with the V···V distance of 3.133(2) Å. The V atoms in both complexes are in octahedral coordination. The different of the structures of the complexes is largely induced by the hydrogen bonds during the self-assembly.

Keywords:

• crystal structure
• hydrogen bond
• Schiff base
• synthesis
• vanadium complex

Acknowledgments

The authors acknowledge Taizhou University for funding this work.

Notes

^a R ₁ = ∑||Fo| – |Fc||/∑|Fo|, wR ₂ = [∑w(Fo ² – Fc ²)²/∑w(Fo ²)²]^1/2, w ₁ = [σ ² Fo ² + (0.0098(Fo ² + 2Fc ²)/3)²]⁻¹, w ₂ = [σ ² Fo ² + (0.0349(Fo ² + 2Fc ²)/3)² + 2.4709(Fo ² + 2Fc ²)/3]⁻¹.

^aSymmetry code: (i) 1 – x, 2 – y, – z.