Bis-glycinato complexes of palladium(II): Synthesis, structural determination, and hydrogen bonding interactions

• Crystal structures of Pd complexes with various glycines at 100 K are reported.
• Pd complexes have same structure in aqueous solution as in solid state.
• Powder diffraction shows same bulk structure as shown by single crystal diffraction.
• N-15 and C-13 labeling of glycine allows for clear NMR studies of solution species.
• Trans isomers formed from Pd3(OAc)6 while cis isomers formed from PdCl2.

Palladium(II) acetate and palladium(II) chloride react with glycine and glycine derivatives in acetone/water to yield square planar bis-chelated palladium amino acid complexes. Glycine, N-methylglycine and N,N-dimethylglycine all adopt the trans configuration when prepared from palladium(II) acetate, whereas glycine adopts a cis configuration when prepared from palladium(II) chloride. The crystal structures of all four complexes were obtained. The extended lattice structures arise from N–H··O or O··(HOH)··O hydrogen bonding. Nuclear magnetic resonance, infrared, high resolution mass spectroscopy, and UV–Vis spectroscopic data are evaluated.

Palladium(II) acetate and palladium(II) chloride react with glycine and glycine derivatives in acetone/water to yield square planar bis-chelated palladium amino acid complexes. Glycine, N-methylglycine and N,N-dimethylglycine all adopt the trans configuration when prepared from palladium(II) acetate, whereas glycine adopts a cis configuration when prepared from palladium(II) chloride.Figure optionsDownload as PowerPoint slide