The recently developed iminophosphorane ligand (phosphasalen) with an ethylene diamine bridge mimics the well-studied salen ligand in coordination geometry around a metal center.1 Replacing the ethylene diamine linker with a diethylene triamine bridge yielded a pentacoordinate ligand2 which when combined with potassium hexamethyl silyl amide and a metal source yielded the corresponding metal complexes. An iron(III) chloride complex was synthesized and characterized spectroscopically and crystallographically which showed an octahedral coordination geometry around the iron center. An air sensitive cobalt(II) complex was prepared through reaction with cobalt(II) acetate and the deprotonated phosphasalen ligand. The cobalt(II) complex was oxidized with iodine yielding a cobalt(III) iodide complex which was characterized with 1H and 31P NMR and absorbance spectroscopy. 1 T.-P.-A. Cao, A. Buchard, X. F. Le Goff, A. Auffrant and C. K. Williams, Inorg. Chem., 2012, 51, 2157. 2 C. Bakewell, T.-P.-A. Cao, N. Long, X. F. Le Goff, A. Auffrant and C. K. Williams, J. Am. Chem. Soc., 2012, 134, 20577.

Synthesis, structural and spectroscopic studies of six-coordinate iron and cobalt phosphasalen complexes

249th National Meeting (2015)

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