Three new sulfides Li 2 CdSnS 4 (1), Na 2 CdSnS 4 (2) and Na 6 CdSn 4 S 12 (3), have been synthesized using a molten flux of alkali-metal polysulfides and structurally characterized by single crystal X-ray diffraction studies. Both the layered compound 1 and the three-dimensional compound 2 have tetrahedral anionic frameworks of (CdSnS 4 ) 2Ϫ and, for charge compensation, alkali-metal cations. The two-dimensional compound 3 has Na ϩ ions interleaved between anionic (CdSn 4 S 12 ) 6Ϫ layers with an octahedral framework. Compounds 1, 2 and 3 are structurally related to Cu 2 CdGeS 4 , LiAlSe 2 and Na 2 SnS 3 respectively. Compound 2, as determined from its diffuse reflectance spectrum, is a semiconductor with a band gap of 1.52 eV.

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