A highly fluorescent tri-nuclear boron complex with large Stokes shifts based on tripodal Schiff base: synthesis and photophysical properties

Abstract

In this study, a new imine-based tripodal ligand and its difluoroboron complex were designed and synthesized. This trinuclear-boron complex was prepared for the first time and fully characterized by common spectroscopic techniques such as 1 H-NMR, 13 C-NMR, FT-IR, UV-Vis and MS analysis. The optical and fluorescence properties of complex were examined in CHCl 3 , THF, acetonitrile, EtOAc, DMF and DMSO. It was revealed that the obtained boron complex showed intense emission with large Stokes shifts in the range from 83 nm to 96 nm. As a result of quantification of fluorescence quantum yields, it has been observed that it has high quantum yield values up to 48%. The large Stokes shifts and high efficient emissions in the solutions of boron complex make it precious fluorophore for potential applications in materials science.

Diiodinated Mono‐ and Dipyridylvinyl BODIPY Dyes: Photophysicochemical Properties, in vitro Antibacterial Studies, Molecular Docking and Theoretical Calculations

“…2) demonstrate that the red shift of the main spectral band arises because the lone pair electrons on the iodine atoms cause a decrease in the HOMO–LUMO gap due to mesomeric interactions with the HOMO which has large MO coefficients at the 2,6‐positions π‐system MOs, resulting in a bathochromic shift (8). The absence of a strong solvent dependence in the λ max values of 1 and 2 can be attributed to their rigid geometry (28).…”