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Reactions of lanthanoid metals with tris(pentafluorophenyl)bismuth or pentafluorophenylsilver and two extensively disparate formamidines, N,N'-bis(2,6-difluorophenyl)formamidine (DFFormH) and N,N'-bis(2,6-diisopropylphenyl)formamidine (DippFormH) have already been investigated as possible redox transmetallation/protolysis (RTP) syntheses of lanthanoid formamidinates. Hence, [Ln(DFForm)3(thf)] (Ln = Lu, 1, Yb, 2, Tm, 3, Er, 4, Ho, 5, Dy, 6; thf = tetrahydrofuran), [L