Hydrazine-Assisted Synthesis, Structures, Photoelectricity, and Photocatalysis of Ternary Mercury–Tellurostannate Hybrids with Transition-Metal Complexes

Xiao Yang, Taohong Ren, Hongjin Zhu, and Dingxian Jia*(贾定先)

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China

Inorg. Chem.2024, 63, 15, 6638–6648

Abstract:Tellurostannates are traditionally prepared by multistep reactions using the tellurides SnTe, SnTe₂, K₄SnTe₄, or A₆SnTe₆(A = K, Rb, or Cs) as precursors, which are usually prepared by the molten reaction of alkali metals Sn and Te under harsh synthetic conditions. Differently, ternary Hg–tellurostannate hybrids [Mn(en)₃]HgSnTe₃(Te₂) (1) (en = ethylenediamine), [Mn(dien)₂]HgSnTe₃(Te₂) (2), and [Fe(dien)₂]HgSnTe₃(Te₂) (3) (dien = diethylenetriamine) were synthesized by one-pot reactions using Sn and Te powders as starting materials in the presence of hydrazine under mild solvothermal conditions. In 1, HgTe₃and SnTe₄units are joined via Te-sharing to form a 1-D polymeric chain [HgSnTe₃(Te₂)]_n^2n–, while the [HgSnTe₃(Te₂)]_n^2n–chains in 2 and 3 are composed of HgTe₄and SnTe₄units. The common feature of the [HgSnTe₃(Te₂)^2–]n chains in 1–3 is that they are constructed by both the telluride anion Te^2–and the polytelluride anion Te₂^2–. 1–3 exhibited strong photocurrent responses with current densities of 5.26, 3.38, and 3.94 μA cm^–2, respectively. They showed effective photocatalytic activities for methylene blue degradation with degradation ratios in the range of 85.3–94.6% after light irradiation for 80 min. Investigation of the photocatalytic mechanism showed that •O^2–radicals and h+ holes were the main active substances in the photodegradation.

链接：https://pubs.acs.org/doi/10.1021/acs.inorgchem.3c04400