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 suprarnolecular networks based on paratungstate and N-donor bridging ligands, [H2bpmp]2,5H[H2W12O40]·2H20（1）, [H2（bpp）]2[H（py-CH3）]0.25 [H（py-C2Hs）]0.25H1.5[H2W12O40]·4H2O（2） and [H2pip]3[H2W12O40]（3）[bpmp=N,N＇-bis（4-pyridylmethyl）piperazine; bpp=l,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-dimen- sional suprarnolecular networks based on [H2W12O40]^6- and the protonated N-donor ligands via the N-H.…O-W hydrogen bonds and/or π…πstacking interactions. Their luminescent properties were investigated.
YAO WeiWANG XinXIE Hong-weiMA Rui-yingYU YangLI Yang-guang
