Synthesis and characterization of palladium complexes of 3-nitroformazans

3-Nitroformazans react with bis(1,1,1,5,5,5-hexafluroacetylacetonato)palladium to afford monometallic complexes. The complexes were characterized via X-ray crystallography, cyclic voltammetry, and electronic spectroscopy. The nature of the aryl substituents on the formazan ligands had a profound effect on the structure and spectroscopy of the complexes, with o-substituted aromatic rings twisted with respect to the ligand, while the p-tolyl substituted derivative adopted a planar structure. The complexes undergo irreversible reductions near −1 V versus Fc/Fc+.

Graphical abstract1,5-Diaryl-3-nitroformazans react with Pd(hfac)2 to give Pd(formazanato)(hfac) complexes which have been structurally, spectroscopically, and electrochemically studied.Figure optionsDownload full-size imageDownload as PowerPoint slide