Abstract

It was found that the lanthanide diiodides LnI 2 ( 1) (Ln = Nd, Sm, Eu, Dy, Tm, Yb) are dissolved in isopropylamine (IPA) without redox transformations. Stability of the formed solutions decreases in a row Eu ≈ Yb > Sm > Tm > Dy > Nd. Removing of a solvent in vacuum leaves complexes LnI 2(IPA) x ( 2) (Nd, x = 5; Sm, Eu, Dy, Tm, Yb, x = 4) as crystalline colored solids. Stability of 2-Nd, Dy, Tm is higher than that of known THF or DME coordinated salts. Divalent state of metal in the products is confirmed by data of UV–Vis spectroscopy, magnetic measurements and their chemical behavior. Structure of 2-Eu and 2-Tm was established by X-ray diffraction analysis. Oxidation of 2-Nd, Dy in IPA affords amine-amides (Pr i NH)Ln(IPA) y ( 3) (Nd, y = 4; Dy, x = 3). n-Propylamine also dissolves the iodides 1-Sm, Eu, Dy, Tm, Yb but stability of the solutions is significantly lower. 1-Nd vigorously reacts with Pr n NH 2 even at −30 °C which hampers the formation of the solution.

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