Synthesis, Spectroscopic Properties And Density Functional Theory Studies Of 1,8 - Naphthyridine And Pyridine Fluoroboron Compounds

1,8-naphthyridine derivatives are one of the most widely studied of a naphthyridine derivative, they have good coordination properties, excellent optical properties and biological activity because of introducing the nitrogen atom and other functional groups. They are widely used in the synthesis of metal complexes, the identification of small molecules and biological metal cations, luminescent materials and biomedical fields. The paper used 2,6-aminopyridine as original material to design and synthesize a series of 1,8-naphthyridine and pyridine derivatives,especially boron and fluorine is introduced into 1,8-naphthyridine structure among research changes in their spectral properties. The main findings are as follows:1. A novel allomorphs C5 was synthesized and the effect of different crystal structures of their optical properties was studied by experiments and theoretical calculations.2. Three novel 1,8-naphthyridine compounds(L1, L2, L3) were synthesized and its spectral response behavior in different solvents were studied under photochemical properties and lighting conditions. Such compounds are a class of compounds sensitive to light having excellent light-emitting properties and response.3. Four novel N, O ligand naphthyridine fluoroboric compounds C1, C2, C3,C4 were synthesized, especially the first time synthesis of a fluorine-based boron bromo 1,8-naphthyridine. The structure of the compounds were determined by X-diffraction、nuclear magnetic resonance, and changes in optical properties of the ligands were also researched.4. The IR was investigated via the density functional method and the influence of the molecular orbital energy due to different substituent groups were revealed by theoretical calculations.