<p>A polyoxometalate-based, inorganic–organic hybrid compound containing a helical structure along the <i>a</i> axis, [Ag(pyttz)<sub>2</sub>][H<sub>2</sub>PW<sub>12</sub>O<sub>40</sub>]·2H<sub>2</sub>O (<i>p-</i>pyttz = 3-(pyrid-4-yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazolyl), has been isolated and structurally characterized. Single-crystal X-ray diffraction analysis reveals that the new compound possesses two helical channels constructed by the left- and right-handed helical chains, respectively, which are fused together through sharing POMs dimer fabricating a 3-D framework with {4<sup>4</sup>·5<sup>3</sup>·6<sup>3</sup>} {4<sup>4</sup>·5<sup>3</sup>·6<sup>3</sup>} topolopy. The new compound displays good acid-catalytic activity toward the synthesis of Aspirin and good oxidation-catalytic activity to the decomposition of Rhodamine B dye; the catalytic reaction kinetics are discussed.</p
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