A series of Keggin-based Ag^I-belt/cycle structures constructed from 5-phenyl-1H-tetrazole and its derivative through Ag–N and Ag–C bonds

Abstract

Three Keggin-based compounds containing Ag^I belts and cycles constructed from 5-phenyl-1H-tetrazole (L¹) and its derivative 5-m-tolyl-1H-tetrazole (L²), [Ag₉L¹₅(PW^VW^VI₁₁O₄₀)]·H₂O (1), [Ag₁₁L¹₆(H₂O)₂(SiMo^VMo^VI₁₁O₄₀)] (2) and [Ag₁₀L²₈(HPMo₁₂O₄₀)]·H₂O (3), have been synthesized under hydrothermal conditions and characterized by IR spectra and single crystal X-ray diffraction. Compound 1 shows a channel-like 3-D metal-organic framework with Keggin anions in channels. Adjacent layers of 2 share the same anions to construct a 3-D framework. Compound 3 has a 2-D metal-organic layer containing Ag^I cycles. Adjacent layers link through sharing Ag–N bonds and a channel-like 3-D framework is formed. Electrochemical and photocatalytic properties of 1–3 have been studied. The experimental results show that 1–3 have excellent catalytic performance for reduction of nitrite and bromate and also have photocatalytic properties for degradation of MB and RhB.

Keywords:

• Keggin polyoxometalate
• 5-phenyl-1H-tetrazole
• 5-m-tolyl-1H-tetrazole
• electrochemical properties
• photocatalytic properties