| CPC B01J 20/223 (2013.01) [B01J 20/3085 (2013.01); C07F 7/226 (2013.01); G21F 9/02 (2013.01); C07B 2200/13 (2013.01)] | 10 Claims |

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1. A two-dimensional chalcogenide, which is a crystalline material, and has a chemical formula of (NH4)2[Sn3S7]·(C4H13N3)1.41, cell parameters of a=b=13.2307(10) Å, c=19.335(2) Å, α=β=90°, and γ=120°, and space group of P63/mmc.
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