Subtle difference of [SiMo₁₂O₄₀]⁴⁻ and [PMo₁₂O₄₀]³⁻ inducing two new distinct Keggin-Ag-(1H-Pyrazole) compounds

Abstract

Two new inorganic-organic hybrid compounds based on α-Keggin clusters and Ag-(1H-Pyrazole) subunits, [AgL₂]₄[SiMo₁₂O₄₀] (1) and [AgL₂]₃[PMo₁₂O₄₀] (2) (L = pyrazole), have been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction. In 1, there are two kinds of chains, the chains linked by two [AgL₂]⁺ clusters and the other linked only by one [AgL₂]⁺, which further connect by sharing [SiMo₁₂O₄₀]⁴⁻ anions to construct a 2-D layer. In 2, four-supporting [PMo₁₂O₄₀]³⁻ anions are fused by [Ag(1)L₂]⁺ subunits to form a 1-D chain. Through weak interactions of Ag⋯O (3.091 Å) a 2-D supramolecular layer is constructed. Additionally, the electrochemical properties of title compounds and the photocatalytic properties of 2 have been studied.

Keywords:

• Keggin polyoxometalate
• pyrazole
• crystal structure
• electrochemical properties
• photocatalytic properties