Synthesis and Crystal Structure of Barium Thioborate Ba7(BS3)4S

The thioborate phase Ba7(BS3)4S crystallizes in the monoclinic space group C2/c (No. 15) with a = 10.1750(15) Å, b = 23.970(4) Å, c = 10.1692(15) Å, β = 90.095(2)°, and Z = 4. The structure consists of isolated trigonal planar (BS3)3- anions, and isolated S2- anions and Ba2+ cations. The vibrational modes of the isolated (BS3)3- units were measured from Raman scattering and IR absorption spectra, and the frequencies agree very well with those found for similar orthothioborate phases