Imidazolate

It is a nucleophile and a strong base.

The free anion has C2v symmetry.

Imidazole has a pKa of 14.05,[1] so the deprotonation of imidazole (C3H3N2H) requires a strong base.

Imidazolate is a common bridging ligand in coordination chemistry.

[4][5] In the enzyme superoxide dismutase, imidazolate links copper and zinc centers.

In the human SOD1 enzyme ( N-terminus = blue, C-terminus = red), the copper (orange sphere) and zinc (grey one) are bridged by imidazolate. [ 3 ]