Hydrogen Evolution from Water under Visible-Light Irradiation Using Keggin-Type Platinum(II)-Coordinated Phospho-, Silico-, and Germanotungstates as Co-Catalysts
The tetramethylammonium salts of diplatinum(II)
complexes composed of mono-lacunary Keggin-type silico and germanotungstates, [(CH3)4N]4[α-SiW11O39{cis-Pt(NH3)2}2]·13H2O (TMA-Si-Pt)
and [(CH3)4N]4[α-GeW11O39{cis-Pt(NH3)2}2]·11H2O (TMA-Ge-Pt),
were synthesized and crystallized. Single crystals of a tetramethylammonium
salt of Keggin-type diplatinum(II)-coordinated
phosphotungstate [(CH3)4N]3[α-PW11O39{cis-Pt(NH3)2}2]×10H2O (TMA-P-Pt) were also obtained. The X-ray structural analyses revealed that the two cis-platinum(II) moieties, [cis-Pt(NH3)2]2+,
were each coordinated to two oxygen atoms in a mono-vacant site of [XW11O39](12-n)- (Xn+ = Si4+, Ge4+, P5+). FTIR
spectra of TMA-Si-Pt and TMA-Ge-Pt also suggested that the two platinum(II)
moieties were coordinated to the vacant site
of [SiW11O39]8- and [GeW11O39]8-.
The 1H NMR spectra in DMSO-d6 of TMA-Si-Pt and TMA-Ge-Pt
showed signals assigned to the two sets of NH3 ligands coordinated to the platinum sites. These three
platinum compounds showed hydrogen
evolution from aqueous triethanolamine solution under visible light
irradiation (λ ≥ 400 nm) in the presence of eosin Y, α-Keggin mono-aluminum-substituted
silicotungstate, and titanium dioxide. The catalytic activities were influenced by the
central atoms, and TMA-P-Pt showed the highest activities among the three
platinum compounds.
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