Synthesis, crystal structure, photocatalysis, photocurrent response: one-dimensional K 2 HgSnSe 4 and three-dimensional Na 6 Cu 8 Sn 3 Se 13

By using different solvent molecules as structure agents, two novel selenidostannates were solvothermally synthesized. In compound K 2 HgSnSe 4 (1), tetrahedral Hg/SnSe 4 are linked by edge-sharing to form one-dimensional (1D) anion chains [HgSnSe 4 ] 2− , and these chains are separated by K + ions. Compound Na 6 Cu 8 Sn 3 Se 13 (2) contains a copper-rich [Cu 8 Sn 3 Se 13 ] 6− framework that is charge-balanced by Na + ions, and a 16-membered ring with an aperture of 9.62 × 9.62 Å 2 is generated in the middle. The photodegradation activity of methylene blue (MB) was studied and 2 showed excellent photodegradation efficiency. Also, the optical properties, photocurrent response and band structures of 1 and 2 were investigated.