Two new Schiff-base modified vanadium complexes with third-order NLO properties

Abstract

Two new Schiff-base modified vanadium complexes, [V^IVO(C₇ H₅O)₂(N₂C₆H₁₀)] (1) and [V^VO₂(C₇H₅O)(N₂C₆H₁₂)] (2), were synthesized under hydrothermal conditions, in which salicylaldehyde and cyclohexanediamine were used directly to form Schiff-base ligands during the reactions. The structures of 1 and 2 were characterized by EA, FT-IR, UV-vis, SCXRD and PXRD, EPR spectroscopy and magnetic susceptibility measurement. Due to the good optical activity of Schiff-base ligands and the existence of conjugated benzene rings in 1 and 2, the delocalized electronic effects between Schiff-base ligands and vanadium can be improved. Therefore, the third-order non-linear optical (NLO) properties of these complexes were investigated. The results of the open aperture Z-scan tests show that the two-photon absorption (TPA) cross-sections (σ) of the complexes are 1033 and 1041GM, respectively, which indicated that they both have potential applications as NLO materials.

Graphical Abstract

Keywords:

• Vanadium complexes
• Schiff-base
• crystal structure
• open aperture Z-scan technique
• third-order NLO properties

Disclosure statement

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

Additional information

Funding

This work was supported by the Natural Science Foundation of JiangsuProvince (BK20191359) and China (Grant 21571103), the Major Natu-ral Science Projects of the Jiangsu Higher Education Institution (Grant 16KJA150005).