Abstract
Reactions of SmII, TbIII, TmII, YbII, and LuIII iodides with 2,2′-bipyridyllithium in THF afford [Li(THF)4][Ln(bipy) n ] complexes (n=3 or 4) containing trivalent lanthanides. X-ray structural analysis demonstrated that in the crystalline state, the Yb derivative has the ionic structure, [Li(THF)4]+[Yb(bipy)3]−. In THF solutions, the reversible ligand exchange between metal atoms occurs to yield neutral compounds [Ln(bipy) n−1(THF) x ] and [Li(bipy)(THF) y ]. A decrease in the temperature shifts the equilibrium to ionic pairs.
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