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A new modification of MnSb 2 S 4  was synthesized by solid state reaction of MnS, and Sb 2 S 3  at 500 °C. The monoclinic, purple-red compound crystallizes in the HgBi 2 S 4  structure type. Single crystal measurements provided the space group C2/m (no. 12) with a = 12.747(3) Å, b = 3.799(1) Å, c = 15.106(3) Å, β = 113.91(3)°, V = 668.7(3) Å 3 , and Z = 4. The refinement converged to R = 0.0403, and wR = 0.1001 for 913 unique reflections and 46 parameters. The crystal structure of MnSb 2 S 4  (mC28) consists of strands of edge-sharing octahedra [MnS 6 ] which are interlinked to layers by distorted square pyramids [SbS 5 ] (d(Sb-S) &lt; 3.1 Å). MnSb 2 S 4 (mC28) shows a greater distortion of the [Sb-S] polyhedra as compared to the [Bi-S] polyhedra in analogous MnBi 2 S 4 . This is due to an enhanced stereochemical influence of the lone electron pair of Sb 3+ . Raman spectra of MnSb 2 S 4  (mC28) are dominated by ν  Sb-S  stretching modes at 300 cm -1 , and at 283 cm -1 , respectively.

A new modification of MnSb 2 S 4 crystallizing in the HgBi 2 S 4 structure type