Anion-controlled formation of an aminal-(bis)imine Fe(ii)-complex.

In the presence of triflate as the counter anion, 1,2-diaminobenzene and 2-formylpyridine self-sort with iron(ii) to a low-spin [Fe(L1)](OTf)2 complex in which both aminal and imine moieties coexist simultaneously, while under similar conditions the chloride anion leads to a high-spin [Fe(L2)Cl2] complex.

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