Co-reporter:Keshu Di, Xue Li, Xinda Jing, Shuang Yao, Jinghui Yan
Journal of Alloys and Compounds 2016 Volume 661() pp:435-440
Publication Date(Web):15 March 2016
DOI:10.1016/j.jallcom.2015.11.197
•The usually used rare earth-based host was replaced by low cost KZnF3-based host.•The energy transfer from Tb3+ to Eu3+ in the KZnF3 matrix was discussed in detail.•The white emission was obtained by adjusting the concentration of Tm3+ ions.KZnF3: Ln3+ (Ln3+ = Eu3+, Tb3+, Eu3+/Tb3+, Eu3+/Tb3+/Tm3+) phosphors were prepared by the oleic acid assisted hydrothermal synthesis method. X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), photoluminescence (PL) spectra, as well as lifetimes were utilized to characterize the samples. For KZnF3: Eu3+, Tb3+ samples, the energy transfer mechanism and pathway were proposed by comparing the experimental data and theoretical calculation. By adjusting the doping concentration of Tm3+ ions in KZnF3: 0.05 Tb3+, 0.07 Eu3+, z Tm3+, a white emission in a single composition was obtained. These phosphors might be promising for use in UV LEDs.The Eu3+, Tb3+ and Tm3+ doped/co-doped KZnF3 powders with white emission are successfully synthesized by adjusting the concentration of Tm3+ in the phosphor. And the energy transfer mechanism as well as efficiency in the KZnF3: Eu3+, Tb3+ phosphors are discussed in detail.
Co-reporter:Yang-Yang Zhou, Ya-jie Kong, Qian-Qian Jia, Shuang Yao and Jing-Hui Yan
RSC Advances 2016 vol. 6(Issue 40) pp:33946-33950
Publication Date(Web):22 Mar 2016
DOI:10.1039/C6RA00223D
Two novel core–shell-like molecular composites, [Ni(dap)3]4[HVIV12VV6O42(PO4)] (1) and [Ni(dap)2]4[HVIV12VV6O42(PO4)]·4H2O (2) (dap = 1,2-diaminopropane), were obtained from the supermolecular assembly of polyoxoanions and metal–organic cationic units. These two inorganic–organic hybrids were prepared under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, PXRD and single crystal X-ray diffraction analysis. In the well defined molecular core–shell structure of composite 1, the sphere-like anion [PV18O46]9− was surrounded by a shell composed of eight windmill-type [Ni(dap)3]2+ cationic units. In 2, ten sheet-like [Ni(dap)2]2+ metal–organic groups surrounded the sphere-like anion [PV18O46]9−, which was achieved by the easy alteration of the chemical composition of the core–shell structure by simply adjusting the feeding amount of dap. The resulting core–shell-like molecular composites represent a promising structural model toward core–shell nanostructures and exhibit electrocatalytic activity for the reduction of H2O2 and oxidation of NO2−.
Co-reporter:Yang-Yang Zhou, Shuang Yao, Jing-Hui Yan, Li Chen, Ting-Ting Wang, Chun-Jie Wang and Zhi-Ming Zhang
Dalton Transactions 2015 vol. 44(Issue 47) pp:20435-20440
Publication Date(Web):16 Oct 2015
DOI:10.1039/C5DT03397G
Two purely inorganic three-dimensional (3D) frameworks [Mn4(H2O)11VIV18O42(PO4)]7− (1) and [Mn2(H2O)7VIV18O42(PO4)]11− (2) were synthesized under hydrothermal conditions and fully characterized by single-crystal X-ray structural analysis, IR spectroscopy, thermogravimetric analysis and PXRD. Structural analysis revealed that these two compounds contained a similar all reduced polyoxoanion [VIV18O42(PO4)]15− linked by different amounts of manganese centers to form 3D framework materials. The V centers in these two compounds were all reduced to the +IV oxidation state, resulting in an all reduced polyoxoanion, which was firstly used as the building block for constructing 3D framework materials. The all reduced typical polyoxoanion [VIV18O42(PO4)]15− with 15 negative charges supplied enough charge amount to accept TM cations. In these two structures, the anions were surrounded by 12 and 5 Mn2+ ions, respectively, adjusted by varying the feeding amount of MnCl2·4H2O. An electrocatalytic study revealed that compound 1 exhibits electrocatalytic activity for reduction of H2O2.
Co-reporter:Ai-Xue Yan;Dr. Shuang Yao; Yang-Guang Li;Dr. Zhi-Ming Zhang;Dr. Ying Lu;Dr. Wei-Lin Chen; En-Bo Wang
Chemistry - A European Journal 2014 Volume 20( Issue 23) pp:6927-6933
Publication Date(Web):
DOI:10.1002/chem.201400175
Abstract
Various polyoxometalates (POMs) were successfully immobilized to the mesoporous coordination polymer MIL-101 resulting in a series of POM–MOF composite materials POM@MIL-101 (POM=K4PW11VO40, H3PW12O40, K4SiW12O40). These materials were synthesized by a simple one-pot reaction of Keggin POMs, tetramethylammonium hydroxide (TMAH), terephthalic acid (H2bdc), and Cr3+ ions. XRD, FTIR, thermogravimetric analyses (TG), inductively coupled plasma (ICP) spectrometry, and energy-dispersive X-ray spectroscopy (EDX) collectively confirmed the successful combination of POMs and the porous framework. Further, these composites POM@MIL-101 with different loading of POMs were achieved by variation of the POM dosage. Notably, the uptake capacity of MIL-101 towards organic pollutants in aqueous solution was significantly improved by immobilization of hydrophilic POMs into cages of MIL-101. An uptake capacity of 371 mg g−1, comparable to that of the graphene oxide sponges, and much higher than that of the commercial activated carbon, was achieved at room temperature in 5 min when dipping 20 mg PW11V@MIL-101 in the methylene blue (MB) solution (100 mL of 100 mg L−1 MB solution). Further study revealed that the POM@MIL-101 composite materials not only exhibited a fast adsorption rate towards dye molecules, but also possessed of selective adsorption ability of the cationic dyes in wastewater. For example, the adsorption efficiency of PW11V@MIL-101 (10 mg) towards MB (100 mL of 10 mg L−1) could reach 98 % in the initial 5 min, and it could capture MB dye molecules from the binary mixture of the MB and MO with similar size. Also, the POM@MIL-101 materials could be readily recycled and reused, and no POM leached in the dye adsorption process.
Co-reporter:Shuang Yao, Hong-Li Wu, Zhi-Qi Lei, Jing-Hui Yan, En-Bo Wang
Chinese Chemical Letters 2013 Volume 24(Issue 4) pp:283-286
Publication Date(Web):April 2013
DOI:10.1016/j.cclet.2013.02.008
One novel “S”-shaped isopolyoxotungstate Ca2(H2O)12{Ca4(H2O)18[H2W11O37]2}·20H2O (1) has been successfully synthesized by the conventional aqueous solution method. Single-crystal X-ray diffraction analysis revealed that compound 1 crystallized in triclinic system, space group P−1, with lattice constants a = 12.591(3) Å, b = 12.738(3) Å, c = 17.961(4) Å, α = 98.97(3)°, β = 99.85(3)°, γ = 93.42(3)°. The “S”-shaped cluster was built from two {W11} subunits, four Ca2+ linking units and two {Ca(H2O)6}2+ decorating fragments. The electrochemical properties of 1 have been investigated in details.An “S”-shaped isopolyoxotungstate decorated by alkaline earth metal ions was reported, which offered a convincing example that lacunary isopolyoxotungstate could be used as excellent inorganic multidentate O-donor ligands to incorporate functional ions for constructing POM clusters.
Co-reporter:Shuang Yao, Jinghui Yan, Yanchun Yu, Enbo Wang
Inorganic Chemistry Communications 2012 Volume 23() pp:70-73
Publication Date(Web):September 2012
DOI:10.1016/j.inoche.2012.06.010
Two extended architectures, Na2[Cu(en)2]9{K4Na2[Dy(SiW11O39)2]2}·32H2O (1), K2[Cu(en)2]9{K4Na2[Ho(SiW11O39)2]2}·41H2O (2) (en = ethylenediamine), have been successfully synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction analysis, element analysis, IR spectroscopy, thermal gravimetric analysis and powder X-ray diffraction (PXRD). Single crystal X-ray diffraction analysis revealed that both 1 and 2 contain a tetrameric polyoxoanions, consisting of four {α-SiW11O39} building blocks, two lanthanide cations, a {K4Na2} linking fragment and four decorating [Cu(en)2]2+ groups. Interestingly, the tetrameric polyoxoanions in 1 and 2 are bridged into a one dimensional (1D) infinite chain by additional [Cu(en)2]2+ bridges.Two extended architectures built upon 3d–4f heterometals-containing tetrameric silicotungstate clusters have been successfully synthesized under hydrothermal conditions.Highlights► Extended structures built upon 3d–4f heterometallic silicotungstate clusters. ► The tetrameric clusters were connected by the Cu2+ linkers via bridging oxo-atoms. ► There are antiferromagnetic interactions that exist in the heterometals-containing POM.
Co-reporter:Yang-Yang Zhou, Shuang Yao, Jing-Hui Yan, Li Chen, Ting-Ting Wang, Chun-Jie Wang and Zhi-Ming Zhang
Dalton Transactions 2015 - vol. 44(Issue 47) pp:NaN20440-20440
Publication Date(Web):2015/10/16
DOI:10.1039/C5DT03397G
Two purely inorganic three-dimensional (3D) frameworks [Mn4(H2O)11VIV18O42(PO4)]7− (1) and [Mn2(H2O)7VIV18O42(PO4)]11− (2) were synthesized under hydrothermal conditions and fully characterized by single-crystal X-ray structural analysis, IR spectroscopy, thermogravimetric analysis and PXRD. Structural analysis revealed that these two compounds contained a similar all reduced polyoxoanion [VIV18O42(PO4)]15− linked by different amounts of manganese centers to form 3D framework materials. The V centers in these two compounds were all reduced to the +IV oxidation state, resulting in an all reduced polyoxoanion, which was firstly used as the building block for constructing 3D framework materials. The all reduced typical polyoxoanion [VIV18O42(PO4)]15− with 15 negative charges supplied enough charge amount to accept TM cations. In these two structures, the anions were surrounded by 12 and 5 Mn2+ ions, respectively, adjusted by varying the feeding amount of MnCl2·4H2O. An electrocatalytic study revealed that compound 1 exhibits electrocatalytic activity for reduction of H2O2.
![[1,1'-Biphenyl]-3,3',4,4'-tetracarboxylic acid](/data/chemimg/2200/22803-05-0.png)
![[1,1'-Biphenyl]-3,3',4,4'-tetracarboxylic acid](/data/chemimg/2200/22803-05-0_b.png)
