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

<p>Two new inorganic-organic hybrid compounds based on <i>α</i>-Keggin clusters and Ag-(1H-Pyrazole) subunits, [Ag<b>L</b>₂]₄[SiMo₁₂O₄₀] (<b>1</b>) and [Ag<b>L</b>₂]₃[PMo₁₂O₄₀] (<b>2</b>) (<b>L</b> = pyrazole), have been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction. In <b>1</b>, there are two kinds of chains, the chains linked by two [Ag<b>L</b>₂]⁺ clusters and the other linked only by one [Ag<b>L</b>₂]⁺, which further connect by sharing [SiMo₁₂O₄₀]⁴⁻ anions to construct a 2-D layer. In <b>2</b>, four-supporting [PMo₁₂O₄₀]³⁻ anions are fused by [Ag(1)<b>L</b>₂]⁺ 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 <b>2</b> have been studied.</p