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

Abstract

By heating of FeCl2 and MnCl2 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 GeI4 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.