The visible light photocatalytic H 2 evolution activities of a series of transition-metal substituted Keggin-structure heteropoly blues K 6 SiW 11 O 39 M(H 2 O)·nH 2 O (M=Co,Ni,Cu and Zn) were systematically studied with Pt nanoparticles as co-catalyst.The H 2 evolution rates were 150,98,65 and 48 mol h-1g-1 for SiW 11 Cu,SiW 11 Ni,SiW 11 Co and SiW 11 Zn,respectively,meaning that the order of photocatalytic activity of these heteropoly blues from transition-metal substituted polyoxometalates was:SiW 11 Cu > SiW 11 Ni > SiW 11 Co > SiW 11 Zn.The catalysts could be efficiently reused for at least 5 cycles.
ZhenLi WangYing LuYangGuang LiShiMing WangEnBo Wang
Three new supramolecular networks based on paratungstate and N-donor bridging ligands,[H2bpmp]2.5H[H2W12O40] 2H2O(1),[H2(bpp)]2[H(py―CH3)]0.25 [H(py―C2H5)]0.25H1.5[H2W12O40]·4H2O(2) and [H2pip]3 [H2W12O40](3)[bpmp=N,N'-bis(4-pyridylmethyl)piperazine;bpp=1,3-bis(4-pyridyl)propane;py=pyridine;pip=piperazine] were prepared by the hydrothermal synthesis and characterized by elemental analysis,infrared(IR),thermogravimetric(TG) analysis and single-crystal X-ray diffraction(XRD).All the compounds show high-dimensional supramolecular networks based on [H2W12O40]6-and the protonated N-donor ligands via the N―H···O―W hydrogen bonds and/or π···π stacking interactions.Their luminescent properties were investigated.
YAO WeiWANG XinXIE Hong-weiMA Rui-yingYU YangLI Yang-guang
