Different Hemi-Salen/Salan Ligand Containing Binuclear Boron-Fluoride Complexes: Synthesis, Spectroscopy, Fluorescence Properties, and Catalysis

ABSTRACT A family of hemi-salen (L1H–L6H) and hemi-salan (L1aH–L2aH) ligands-based N,O-chelated binuclear boron-fluoride [Ln(BF2)2] (n = L1–L6 or L1a–L2a) complexes have been prepared and characterized by a variety of spectroscopic techniques (1H, 13C and 19F NMR, FT-IR, UV-Vis, LC-MS, and fluorescence spectra) and elemental analysis. All of the binuclear boron-fluoride complexes exhibit strong absorption bands due to S0→S1 transitions and strong fluorescence properties were observed at room temperature in the solution. The binuclear boron complexes containing two naphthyl groups are significantly red-shifted in comparison with the other binuclear boron-fluoride complexes. After the structures are characterized, these hemi-salen and salan ligand-based N, O-chelated binuclear boron-fluoride complexes were utilized to the transfer hydrogenation of the different acetophenone derivatives conversion to 1-phenylethanol derivatives as catalysts.

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