Abstract
The well characterized complex of Cu(II) and glycyl- L-histidine consists of a tridentate ligand bound to Cu(II) by amino, ionized amide, and one of two imidazole nitrogen donors. The Ni(II) and Pd(II) complexes possess a similar structure. The 1 : 1 complexes of all three metal ions undergo a deprotonation at about pH 9·6. Significant blue shifts in the absorption spectra accompany this deprotonation, suggesting that a nitrogen donor rather than hydroxide ion replaces water in the fourth coordination position about the transition metal ion. Ionization at an unbound imidazole nitrogen permits it to coordinate at the fourth position of a metal ion chelated by another ligand molecule. Quantitative spectrophotometric analysis of the yellow Ni(II) complex indicates that the structure formed after ionization is the tetramer, ( ML) 4 4−. Space-filling molecular models show that a unique tetramer is the smallest polymer which permits four nitrogen donors about each metal ion and no uncoordinated nitrogen atoms.
Published Version
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