Publications by authors named "Yixian Xiang"

Article Synopsis
  • - A new type of metal-oxocage complex, specifically a cuboid 12-palladium-oxo cage, was created using various metal ions, and its structural characteristics were determined using advanced techniques like X-ray diffraction and IR spectroscopy.
  • - The synthesized compounds are notable examples of polyoxopalladates, and their stability in different states was confirmed through multiple analytical methods, including NMR spectroscopy and mass spectrometry.
  • - Catalytic experiments revealed that the efficiency of these metal-oxo complexes in hydroconversion reactions varies depending on the guest metal ion, with specific compounds showing better performance as precatalysts.
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We introduce the class of discrete silver(I)-palladium(II)-oxo nanoclusters with the preparation of {Ag Pd } and {Ag Pd }. Both polyanions represent the first examples of noble metal-capped polyoxo-noble-metalates in a fully inorganic assembly, featuring an unprecedented host-guest mode containing hetero- and homometallic Ag-Pd and Ag-Ag bonding interactions. Comprehensive theoretical calculations suggest that the Ag-Pd metallic bonds originate partially from surface confinement of Ag guest ions onto the anionic polyoxopalladate host that is induced by strong electrostatic forces.

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The hepta-Ni(2+)-containing 30-tungsto-4-phosphate(v) [Ni7(OH)6(H2O)6(P2W15O56)2](16-) (1) has been synthesized in aqueous, slightly basic medium under conventional reaction conditions, and charactarized via different physical methods. Single-crystal XRD showed that 1 consists of a corner-fused double-cubane {Ni7(OH)6(H2O)6}(8+) fragment sandwiched by two trilacunary [P2W15O56](12-) units. Polyanion 1 is solution-stable as shown by (31)P NMR.

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Article Synopsis
  • The study reports the successful synthesis of multi-Fe(III)-containing polyoxotungstates, specifically [Fe14O6(OH)13(P2W15O56)4](31-) and [Na2Fe14(OH)12(PO4)4(A-α-XW9O34)4], using conventional methods in different pH conditions.
  • The synthesized polyanions were characterized through various techniques, including single-crystal X-ray diffraction and IR spectroscopy, to confirm their structural properties.
  • Additionally, these compounds were analyzed in solution using electrochemistry to gain insights into their behavior in different environments.
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The three novel, discrete palladium(II)-oxo clusters [CaPd12O8(PhAsO3)8](6-) (CaPd12), [SrPd12O6(OH)3(PhAsO3)6(OAc)3](4-) (SrPd12), and [BaPd15O10(PhAsO3)10](8-) (BaPd15) encapsulating alkaline earth metal ions were prepared and fully characterized by a multitude of solution and solid-state physicochemical techniques. We have discovered a structure-directing template effect induced by the respective size of the alkaline earth guest ion, which determines the detailed condensation arrangement of the peripheral Pd(II)-oxo shell. The unprecedented SrPd12 with an open-shell type structure is of particular importance and reflects a successful strategy for deliberate design of new structural classes of polyoxo-noble-metalates.

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The two Ni(2+)-containing heteropolytungstates [Ni14(OH)6(H2O)10(HPO4)4(P2W15O56)4](34-) (Ni14) and [Ni5(OH)4(H2O)4(β-GeW9O34)(β-GeW8O30(OH))](13-) (Ni5) have been successfully synthesized in aqueous, basic media under conventional reaction conditions, and they were characterized by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetric and elemental analyses, electrochemistry, and magnetic studies. The cyclic voltammetry (CV) patterns of Ni14 and Ni5 showed chemically reversible multielectronic waves for slow scan time scales. For Ni14, an important acidity inversion effect between its reduced forms was observed.

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The discrete heteropolyaurate [Au(III)(4)O(4)(Se(IV)O(3))(4)](4-) (Au(4)Se(4)) represents only the second member of this class ever reported, and was synthesized via one-pot room temperature condensation in aqueous medium. was structurally characterized in the solid state and in solution by single-crystal XRD, TGA, FT-IR, (77)Se NMR, mass spectrometry and electrochemistry.

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