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[13]  (a) The combination of Fe salts and acids has also been previously reported. See: (a) M. C. White, A. G. Doyle, E. N. Jacobsen, J. Am. Chem. Soc. 2001, 123, 7194.
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[18]  CCDC 828098 ([1·Fe·DME·H₂O]²⁺·2ClO₄^–). These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.au.uk/data_request/cif.

[19]  During our studies, the heptacoordination around Fe was confirmed by two other X-ray structures: CCDC 850236 ([1·Fe·2MeCN·H₂O]²⁺·2ClO₄^–) and CCDC 864123 ([1·Fe·2THF·H₂O]²⁺·2Br^–). These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.au.uk/data_request/cif.

[20]  Fe(ClO₄)₂·6H₂O (1.0 equiv), Bolm’s ligand (3.0 equiv), and benzoic acid (1.2 equiv) were solubilized in acetonitrile. After 0.5 h, a clear orange solution was obtained and the solvent was evaporated.