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Imidazolate (C3H3N−
2) is the conjugate base of imidazole. It is a nucleophile and a strong base. The free anion has C2v symmetry. Imidazole has a pKa of 14.05, so the deprotonation of imidazole (C3H3N2H) requires a strong base.
Occurrence
Imidazolate is a common bridging ligand in coordination chemistry. In the zeolitic imidazolate frameworks, the metals are interconnected via imidazolates. In the enzyme superoxide dismutase, imidazolate links a Cu and Zn centers.
References
Imidazolate Wikipedia(Text) CC BY-SA