A green paramagnetic gold fluoride - Sn1-xAuxF4?

Article abstract of DOI:10.1002/zaac.19966221016

Green single crystals were obtained by heating (Au-tube, 450°-500°C) a mixture of SnF₂ and AuF₃ (Sn:Au = 1:1) which correspond to the SnF₄-type [2, 3] (two single crystals, A: 762 I_o, R1 = 2.4%; B: 1591 I_o, R1 = 1.2% (SHELXL=93); I4/mmm (No. 139); B: a = 404.8(1) pm, c = 796.4(1) pm, c/a = 1.97, z_F2 = 0.2354). Due to atom absorption and Moessbauer measurements the crystals contain Au. The compound is paramagnetic and follows the Curie-Weiss law (14.7-251.3 K, θ = -12K, μ/μ_B = 1.55). ESR-experiments confirm that Au is surrounded by 6 F^- according to Sn in SnF₄ (2 short (187.5 pm) and 4 longer (202.4 pm) distances). The observed Moessbauer spectra could not be interpreted yet, but they don't correspond to any known. Johann Ambrosius Barth 1996.