The synthesis, characterization and fluorescent properties of a new Schiff base-boron complex

Abstract

In this study, it is aimed to obtain of N,N'-Bis(3-tert-Butyl-5-methylsalicylidene)-1,2diaminoethane-boron complex (3) in three-step reaction. In the first step, an aromatic aldehyde derivative was synthesized by the o-formylation reaction with commercially available an aromatic phenol. The condensation reaction was carried out to give the imine derivative as a Schiff base ligand (2). The fluorine chelated boron complex was synthesized through the reaction of BF 3 .OEt 2 with ligand (2). This Schiff baseboron complex was reported for the first time and was fully characterized by common spectroscopic techniques such as 1 H-NMR, 13 C-NMR, FT-IR, UV-Vis, MS and elemental analysis. The spectroscopic properties of the target boron-complex were examined with the absorption and fluorescence spectroscopy. It was determined that the obtained boron complex is highly emissive molecule in different solvents with large Stokes shifts reaching 100 nm. Moreover, the measurements of the fluorescence quantum yields (up to 48%) were performed.