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By heating of FeCl 2  and MnCl 2  in the ionic liquid [BMIm][OTf] (BMIm: 1-butyl-3- methylimidazolium, OTf: trifluoromethanesulfonate), the compounds [BMIm][M(OTf) 3 ] (M: Fe +II , Mn +II ) have been obtained as colorless crystals. Similarly, [BMIm][Li(OTf) 2 ] was synthesized by heating of LiCl in [BMIm][OTf]. While the crystal quality of the [BMIm][M(OTf) 3 ] (M: Fe +II , Mn +II ) products thus obtained is low, mild oxidation of Fe(CO) 5  or Mn2(CO) 10  with GeI 4  applied as an alternative in the same ionic liquid allowed a slow growth of well-formed, needle-shaped crystals. According to X-ray structure analysis based on single crystals, [BMIm][M(OTf) 3 ] (M: Fe +II , Mn +II ) crystals are monoclinic, and [BMIm][Li(OTf) 2 ] crystals are triclinic. All compounds form infinite  1  ∞ [M(OTf) 3 ] (M=Fe, Mn) and  1  ∞ [Li(OTf) 2 ] chains. The compounds have further been characterized by FT-IR spectroscopy, energy-dispersive X-ray analysis (EDX), differential thermal analysis (DTA), thermogravimetry (TG), and magnetic measurements.

[BMIm][Fe(OTf) 3 ], [BMIm][Mn(OTf) 3 ], [BMIm][Li(OTf) 2 ] – Three One-dimensional Infinite Coordination Polymers