Zhang J, Bhattacharya S, Nisar T, Wagner V, Kortz U. Discrete Platinum(II/IV)-Arsenito Clusters with Pt-As and Pt-O Bonding: [Pt
IV(As
3O
6)
2]
2-, [Pt
4II(H
2AsO
3)
6(HAsO
3)
2]
2-, and [Pt
2IIAs
6W
4O
28]
10.
Inorg Chem 2023;
62:19603-19611. [PMID:
37971601 DOI:
10.1021/acs.inorgchem.3c02967]
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Abstract
The first two discrete, fully inorganic platinum(II/IV)-arsenito clusters, [fac-PtIV(As3O6)2]2- (PtAs6) and [Pt4II(H2AsO3)6(HAsO3)2]2- (Pt4As8), as well as the platinum(II)-arsenito heteropolytungstate [Pt2IIAs6W4O28]10- (Pt2As6W4), have been synthesized in aqueous media using simple one-pot reaction conditions. In PtAs6, a PtIV ion is coordinated to two cyclic, tridentate As3O6 units via oxo-donation (PtIV-O ∼ 2.02 Å). In Pt4As8, 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 Pt2As6W4, 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.
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