Discrete Platinum(II/IV)–Arsenito Clusters with Pt–As and Pt–O Bonding: [Pt^IV(As₃O₆)₂]^2–, [Pt₄^II(H₂AsO₃)₆(HAsO₃)₂]^2–, and [Pt₂^IIAs₆W₄O₂₈]^10–

Abstract

The first two discrete, fully inorganic platinum­(II/IV)–arsenito clusters, [fac-PtIV(As3O6)2]2– (PtAs 6 ) and [Pt4 II(H2AsO3)6(HAsO3)2]2– (Pt 4 As 8 ), as well as the platinum­(II)–arsenito heteropolytungstate [Pt2 IIAs6W4O28]10– (Pt 2 As 6 W 4 ), have been synthesized in aqueous media using simple one-pot reaction conditions. In PtAs 6 , a PtIV ion is coordinated to two cyclic, tridentate As3O6 units via oxo-donation (PtIV–O ∼ 2.02 Å). In Pt 4 As 8 , each PtII ion is coordinated to four AsO3 ligands via two oxygens and two AsIII atoms in a square-planar fashion (PtII–AsIII 2.31 Å, PtII–O 2.07 Å), resulting in an open cage-like structure, which forms a strong tetrameric assembly in the solid state mediated by two K+ counterions. In Pt 2 As 6 W 4 , each PtII ion is coordinated by the As atoms of three AsO3 ligands (PtII–AsIII 2.38 Å) and an oxo group (PtII–O 2.07 Å) in addition to bridging two tungsten ions, and this polyanion was characterized in solution by 195Pt NMR.

Last piece of the puzzle: lead-assisted assembly of an arsenopalladate nanostar as an antitumor metallodrug

“…As part of cutting-edge research into polyoxometalates (POMs), polyoxo-noble-metalates are kind of unique for the integration of features from both the structure and properties of POMs and noble metals. [1][2][3][4][5][6][7][8] Of these, polyoxopalladates(II) (POPs) represent the largest subcategory, with more than 80 structures of various shapes and compositions being identified. 2 Encouraged by their extensive application prospects in strategic fields, the development of POPs has stepped into an accelerated stage.…”