Tiffanny Do / Chemistry & Biochemistry / Faculty Mentor: Rasika Dias
Poly(pyridyl)borates represent a novel addition to the widely recognized scorpionate family. Despite their increasing utility in various applications, previously reported poly(pyridyl)borates were predominantly confined to their fundamental structures featuring unsubstituted pyridyl groups. However, a recent development introduces a chemically robust tris(pyridyl)borate variant, featuring fluoro-alkyl groups positioned proximate to the metal coordination site. This compound has been successfully synthesized and employed as a supportive ligand for copper(I), silver(I), and gold(I) ions incorporating t-BuNC and phosphine donors. Distinctly, the CN stretching frequencies of the fluorinated tris(pyridyl)borate-supported t-BuNC complexes of Cu(I), Ag(I), and gold(I) exhibit higher values compared to free t-BuNC. Notably, within this series of group 11 metal-propylene complexes, Cu(I) demonstrates the lowest stretching frequencies, while gold(I) exhibits the highest. The 19F NMR spectroscopy reveals phosphorus–fluorine coupling constants in chloroform at room temperature for both phosphine complexes. Intriguingly, the 19F NMR spectroscopy of the silver phosphine complex also demonstrates a coupling between silver and fluorine, a phenomenon hitherto unobserved in other silver complexes featuring fluorinated poly(pyridyl)borates.
Leave a Reply