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

Abstract

The reaction of the trivalent lanthanoide triflates Ln(OTf)₃ (Ln=Sm, Eu; OTf=CF₃SO₃ ^-) with the respective metals in acetonitrile leads to the Ln(II)-triflates Eu(OTf)₂(CH₃CN) (monoclinic, P2₁/n, Z=4, a=1053.54(1), b=610.28(5), c=1946.92(2) pm, β =98.611(4)) and Sm(OTf)₂(CH₃CN) (monoclinic, P2₁/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(CH₃CN) (monoclinic, P2₁/n, Z=4, a=1056.39(5), b=610.05(3), c=1950.1(1) pm, β =98.900(2)°) has been obtained from SrCO₃ and triflic acid. The compounds have been investigated by X-ray diffraction, vibrational spectroscopy, luminescence spectroscopy, cyclic voltammetry, thermal analysis, and magnetic measurements.

Keywords: Crystal Structure; Divalent Lanthanoides; Luminescence; Magnetism; Triflates.