(CH_3NH_3)_2Sb_2S_4, a New Thioantimonate (III) with Building Groups Stabilized by Hydrogen Bonds

摘要

(CH_3NH_3)_2Sb_2S_4 has been isolated from the reaction of antimony with sulfur in the presence of manganese in an ethanolic solution of methylamine under solvothermal conditions. Two pyramidal SbS_3 units are linked via common S-S edges to give dimeric Sb_2S_4~(2-) anions, which are joined via secondary Sb...S contacts of 3.074 (2) and 2.975 (2)A forming infinite _(infinity)~1[SbS_2]~(-2n) chains consisting of edge-linked #psi#-SbS_4 trigonal bipyramids. The cis configuration of the Sb_2S_4~(2-) anions in the title compounds is observed for the first time. A specific hydrogenbonding pattern between the amino-hydrogen and the sulfur atoms stabilizes this configuration and gives rise to anionic layers separated by the methyl groups.