The Divalent Lanthanoid Triflates Ln(CF₃SO₃)₂(CH₃CN) (Ln=Sm, Eu): Structure, Luminescence, and Magnetism

The reaction of the trivalent lanthanoide triflates Ln(OTf) 3 (Ln=Sm, Eu; OTf=CF 3 SO 3 − ) with the respective metals in acetonitrile leads to the Ln(II)‐triflates Eu(OTf) 2 (CH 3 CN) (monoclinic, P 2 1 / n , Z =4, a =1053.54(1), b =610.28(5), c =1946.92(2) pm, β =98.611(4)) and Sm(OTf) 2 (CH 3 CN) (monoclinic, P 2 1 / n , Z =4, a =1054.41(4), b =612.16(2), c =1952.65(7) pm, β =98.524(2)). The isotypic strontium compound Sr(OTf) 2 (CH 3 CN) (monoclinic, P 2 1 / n , Z =4, a =1056.39(5), b =610.05(3), c =1950.1(1) pm, β =98.900(2)°) has been obtained from SrCO 3 and triflic acid. The compounds have been investigated by X‐ray diffraction, vibrational spectroscopy, luminescence spectroscopy, cyclic voltammetry, thermal analysis, and magnetic measurements.