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Displacement ellipsoid plot (50% probability) of the cation of 2 at 110(2) K. The H atoms were omitted for clarity. Selected bond distances (in Å): Fe1–N1 1.9614(19), Fe1–N2 1.9599(19), Fe1–N3 1.949(2), Fe1–N4 2.0626(19), Fe1–N5 2.030(2), Fe1–N6 1.927(2).