A novel polyoxometalate-based metal-organic compound constructed from an unprecedented [Ag8(Hpyttz)4(H2pyttz)2] cluster and an in-situ [VW12O40]3 − anion

• A novel [VW12O40]3 −-based 2D metal-organic compound (1) has been obtained.
• 1 contains an unprecedented octa-nuclear [Ag8(Hpyttz)4(H2pyttz)2] cluster.
• In compound 1, [VW12O40]3 − was in-situ transformed from [SiW12O40]4 − anion.
• The AgI cluster represents the highest multinuclear AgI subunit in VW12-based MOCs.
• Reports on introduction of multidentate H2pyttz into POM system are very limited.

A novel polyoxometalate (POM)-based metal-organic compound constructed from a multinuclear AgI cluster and Keggin-type [VW12O40]3 − anion, [Ag4(Hpyttz)2(H2pyttz)][HVW12O40]·3H2O (1) (H2pyttz = 5′-(pyridin-4-yl)-1H,2′H-3,3′-bi(1,2,4-triazole), was hydrothermally synthesized and characterized by IR spectroscopy, TG analysis, powder and single-crystal X-ray diffraction. In compound 1, [VW12O40]3 − (VW12) was in-situ transformed from [SiW12O40]4 − anion. Eight AgI ions were connected by six Hpyttz/H2pyttz ligands with three coordination modes forming an unprecedented [Ag8(Hpyttz)4(H2pyttz)2] cluster, which connected with six VW12 anions to construct a 2-D double-layer (3,6)-connected network with {43}2{46.66.83} topology. Moreover, the photocatalytic activity of 1 has been investigated.

A novel [VW12O40]3 −-based 2D (3,6)-connected metal-organic compound containing an unprecedented [Ag8(Hpyttz)4(H2pyttz)2] cluster has been obtained, in which the [VW12O40]3 − anion was in-situ transformed from the [SiW12O40]4 − anion. The octa-nuclear AgI cluster represents the highest multi-nuclear AgI subunit in [VW12O40]3 −-based MOCs. The title compound shows photocatalytic activity toward the decomposition of MB.Figure optionsDownload as PowerPoint slide