Counting Ambidentate Ligands in Coordination Complexes

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In $[\mathrm{M}(\mathrm{e}\mathrm{n})(\mathrm{S}\mathrm{C}\mathrm{N}{)}_4]$, $\mathrm{e}\mathrm{n}$ is a symmetric bidentate ligand while each ${\mathrm{S}\mathrm{C}\mathrm{N}}^{-}$ (thiocyanate) is an ambidentate ligand capable of coordinating through either $\mathrm{S}$ or $\mathrm{N}$; since there are four ${\mathrm{S}\mathrm{C}\mathrm{N}}^{-}$ ions, the number of ambidentate ligands is $4$.