Showing papers by "Jingping Wang published in 2017"
TL;DR: A europium-containing isopolyoxoniobate with the formula (CN3H6)7K3H17{Eu3(H2O)9Nb48O138(H 2O)6}·40 H2O is synthesized under the protection of citric acid and displays a red emission with the long lifetime of 258 μs.
53 citations
TL;DR: The high-nuclearity polyoxovanadate-based carboxylate derivative K6H[VV17VIV12(OH)4O60(OOC(CH2)4COO)8]·nH2O (1) has been successfully synthesized by conventional aqueous methods and structurally characterized and exhibits excellent catalytic activity for the oxidation of sulfides under mild conditions.
Abstract: The high-nuclearity polyoxovanadate-based carboxylate derivative K6H[VV17VIV12(OH)4O60(OOC(CH2)4COO)8]·nH2O (1) has been successfully synthesized by conventional aqueous methods and structurally characterized. The [VV17VIV12(OH)4O60(OOC(CH2)4COO)8]7- polyanion is built up from three cages: one {VV17(OH)4O44} cage and two identical [(VIV3O6)2(OOC(CH2)4COO)4]8- cages. Of the three cages, the {VV17(OH)4O44} is a purely inorganic polyoxovanadate cluster, whereas each of the [(VIV3O6)2(OOC(CH2)4COO)4]8- cages is a vanadium-based organic-inorganic hybrid cluster framed via four adipate ligands linking simultaneously to two triangular {V3} units. The two [(VIV3O6)2(OOC(CH2)4COO)4]8- cages are covalently attached to the central {VV17(OH)4O44} cage via V-O-V bonds in a linear arrangement, resulting in a {V29}-based hybrid cluster skeleton. The catalytic properties of compound 1 for the oxidation of sulfides by tert-butyl hydroperoxide were investigated, and the result indicates that 1 exhibits excellent catalytic activity for the oxidation of sulfides under mild conditions.
40 citations
TL;DR: A series of dysprosium-based lacunary Keggin-type phosphotungstates have been prepared by the reaction of the preformed polyoxometalate (POM) precursor [P2W19O69(OH2)]14− and Dy3+ ions in the solution of organic carboxylic acid.
Abstract: A series of dysprosium-based lacunary Keggin-type phosphotungstates have been prepared by the reaction of the preformed polyoxometalate (POM) precursor [P2W19O69(OH2)]14– and Dy3+ ions in the solution of organic carboxylic acid. Four POM-ligated lanthanide derivatives display four classes of configurations: three dimeric POMs with 2:1 type K2[N(CH3)4]5H4[Dy(α-PW11O39)2]·21H2O (1Dy), 2:2 type Na2[N(CH3)4]4H2[{Dy(α-PW11O39)(H2O)3}2]·28H2O (2Dy), and 2:3 type K8H3[(DyOH2)3(CO3)(α-PW9O34)2]·30H2O (3Dy), together with a tetrameric 4:8 type K14H12[Dy8(PW10O38)4(OH)4(H2O)2 (W3O14)]·57H2O (4Dy). These complexes exhibit the bifunction of luminescence and SMM properties, which indicate a bright prospect in optomagnetic devices. The solid-state fluorescence spectra of 1Dy–4Dy all show yellowish green emission resulting from the characteristic 4f–4f transitions of Dy3+ ions. However, it is interesting that 1Dy including only mononuclear Dy3+ ion has the highest luminous intensity and longest decay time in the visible...
35 citations
TL;DR: Magnetic studies reveal that this dysprosium(III)-containing polytungstoarsenate complex exhibits a butterfly-shaped hysteresis loop up to 8 K, and a thermally activated energy barrier of 101(5) K reached a breakthrough among all polyoxometalate-supported SMMs.
Abstract: A novel dysprosium(III)-containing polytungstoarsenate, [{(AsW9O33)3Dy2(H2O)4W4O9(H2O)}2(NH2(CH2PO3)2)]33–, comprising two identical subunits bridged by an organophosphonate ligand shows single-molecule-magnet (SMM) behavior. Magnetic studies reveal that this complex exhibits a butterfly-shaped hysteresis loop up to 8 K, and a thermally activated energy barrier of 101(5) K reached a breakthrough among all polyoxometalate-supported SMMs.
35 citations
TL;DR: Two novel peroxotantalophosphate clusters are discovered by incorporating phosphorus heteroatom into Ta-oxo framework, which represent the first two examples of heteropolytantalate.
Abstract: Polyoxometalates (POMs) of Nb and Ta are greatly different from those of Mo, W, and V that have been studied extensively and developed well. The latter can be formed simply by acidification of their aqueous monomeric oxoanions and has found application areas from catalysis to magnetism, materials science, medicine, and nanotechnology. Even now the polyoxoniobate (PONb) chemistry has accelerated dramatically over the last 15 years, and a vast expansion of available PONbs has been reported. However, after nearly 200 years of POM research, Ta-based POM chemistry is still at its infant stage and only dominated by the isopolyoxotantalate ions (Ta6 and Ta10) and transition-metal-capped Ta6 species, along with two Ti-substituted polyoxotantalates [Ti2Ta8O28]8– and [Ti12Ta6O44]10– reported very recently. In this study, we discover two novel peroxotantalophosphate clusters [P4(TaO2)6O25]12– (1) and [P4(TaO2)6O24]10– (2) by incorporating phosphorus heteroatom into Ta-oxo framework, which represent the first two exa...
28 citations
TL;DR: In this paper, a monomeric tricobalt-II-substituted phosphotungstate polyanion, [H9P2W15O62Co3]9, was stabilized by attaching an organometallic group, {Mn(CO)3}, for the first time.
Abstract: A monomeric tricobalt(II)-substituted phosphotungstate polyanion, [H9P2W15O62Co3]9-, is stabilized by the attachement of an organometallic group, {Mn(CO)3}, for the first time. The resulting polyoxometalate-supported [Mn(CO)3]+ complex (1) can be used as an efficient catalyst in the cycloaddition of CO2 with epoxides under mild reaction conditions with pyrrolidinium bromide as a cocatalyst. Besides, magnetic measurements show that the compound exhibits weaker ferromagnetic interactions at low temperature.
28 citations
TL;DR: A novel 24-niobic-2-tellurite, [H2Te2Nb24O72]14-, was isolated by incorporating tellurite anions into a polyoxoniobate cage and synthesized cluster represents the first example of a sandwich-type polyoxoniaobate with the largest telluroniobates aggregate.
Abstract: A novel 24-niobic-2-tellurite, [H2Te2Nb24O72]14–, was isolated by incorporating tellurite anions into a polyoxoniobate cage. The synthesized cluster represents the first example of a sandwich-type polyoxoniobate with the largest telluroniobate aggregate. Furthermore, the hybrid material acts as an efficient catalyst for the decolorization of basic fuchsin.
28 citations
TL;DR: A gigantic 16-copper-containing 28-niobate cluster has been prepared by a one-pot reaction, which is the first example of arsenic copper clusters containing polyoxoniobate, and the first tetrahedral arrangement of both the Cu cluster and the [Nb7 O22 ]9- subunits.
Abstract: A gigantic 16-copper-containing 28-niobate cluster, Na14K7H5{As4Cu4[Cu(H2O)]12Nb28O109}∙37.5H2O (1), has been prepared by a one-pot reaction, which is the first example of arsenic copper clusters-containing polyoxoniobate and the first tetrahedral arrangement of both the Cu cluster and the [Nb7O22]9− subunits.
19 citations
TL;DR: In this article, the photochromic properties of four inorganic-organic hybrids based on multicarboxylic acids and antimoniomolybdates were studied and compared, and based on the different carboxyric acids they displayed great disparities in the coloration speed under irradiation; the speed sequence is: 4 {benzene-1,3,5-triacetic acid (BTA) > 2 (suberic acid) > 1 (adipic acid).
Abstract: Four inorganic–organic hybrids based on multicarboxylic acids and antimoniomolybdates, namely, (NH4)4(C3N2H5)4H4[(SbMo6O21)2{OOC(CH2)4COO}3]·7H2O (1), (NH4)8(C3N2H5)2H2[(SbMo6O21)2{OOC(CH2)6COO}3]·8H2O (2), (NH4)24[(SbMo6O21)4{C6H3(COO)3}4]·8H2O (3), and (NH4)6[(SbMo6O21){C9H9(COO)3}]·3H2O (4) have been synthesized under conventional solution conditions. Studies reveal that these compounds are monomers, dimers or tetramers, depending on the structures of the coordinated carboxylic acids. Also, the photochromic properties of these compounds were studied and compared, and based on the different carboxylic acids they displayed great disparities in the coloration speed under irradiation; the speed sequence is: 4 {benzene-1,3,5-triacetic acid (BTA)} > 2 (suberic acid) > 1 (adipic acid). It is indicated that compared to the applied aliphatic acids, the aromatic carboxylic acid ligands will facilitate the enhancement of the coloration speed of organic-POM hybrids.
16 citations
TL;DR: Two novel trans-isomers of 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates [Ln(α2-P2W17O61)2]17- and 2 were successfully isolated and characterized by elemental analysis, IR, TG, and 31P NMR studies.
Abstract: Two novel trans-isomers of 1 : 2-type lanthanide-containing monolacunary Dawson-type tungstophosphates [Ln(α2-P2W17O61)2]17− (Ln = LaIII (1), CeIII (2)) were successfully isolated and characterized by elemental analysis, IR, TG, and 31P NMR studies. Both polyanions 1 and 2 consist of one Ln3+ ion sanwiched between two monolacunary Dawson-type tungstophosphates fragments [α2-P2W17O61]10− oriented at 180° with respect to each other. The solid-state and solution 31P NMR spectroscopy revealed that the trans-[Ce(α2-P2W17O61)2]17− species probably quickly isomerizes to the cis-isomer species in solution.
15 citations
TL;DR: A new heteropolyniobate persists in aqueous solution by means of electrospray ionization mass spectrometry and features an Fe-centred Nb-Keggin unit {Fe3Nb10}.
Abstract: A new heteropolyniobate, [Fe3Nb25O76]18−, persists in aqueous solution by means of electrospray ionization mass spectrometry. It has been synthesized and characterized by IR, TGA, EDX-SEM, magnetic and single-crystal X-ray diffraction, and it features an Fe-centred Nb-Keggin unit {Fe3Nb10}.
TL;DR: The experimental results suggested that compound 1 exhibits good catalytic performance for the epoxidation of cyclooctene, and the catalyst was investigated under mild reaction conditions.
Abstract: A flexible one-pot strategy with pyramidal SeIV heteroatoms was employed for the assembly of the praseodymium-containing gly-decorated polyoxotungstate [{Pr3(H2O)10[Se2W22O76(gly)2]}2(Se2W7O30H2)]18− (1 a), which is constructed from one {Se2W7O30H2} unit and two identical {Pr3(H2O)10[Se2W22O76(gly)2]} units. Furthermore, the catalytic performance of Cs2Na4H12[{Pr3(H2O)10[Se2W22O76(gly)2]}2(Se2W7O30H2)]⋅25 H2O (1) for alkene epoxidation with hydrogen peroxide was investigated under mild reaction conditions, and the experimental results suggested that compound 1 exhibits good catalytic performance for the epoxidation of cyclooctene.
TL;DR: It is noted that compound 1 shows outstanding catalytic activity for oxidation of various sulfides to corresponding sulfones with 93–100% selectivity at 97– 100% conversion in one hour under mild conditions, which is potentially valuable to the removal of organic sulfides.
Abstract: Two sandwich-type polyoxomolybdates Na₈[MO₂{Mo₂O₅(O₃PCH₃C(O)PO₃)}₂] (M = Ni2+ (1); Co2+ (2)) were synthesized by one-pot reaction of Na₂HPMo12O40·14H₂O, 1-hydroxy ethidene diphosphonic acid (HEDP=HOC(CH₃)(PO₃H₂)₂), and (1) NiCl₂/CoCl₂ (2). Compounds 1 and 2 were characterized by single crystal X-ray analysis, X-ray powder diffraction (XRPD), IR spectroscopy, 31P NMR spectra, UV-vis spectroscopy, and thermogravimetric analyses (TGA). Structural analysis reveals that 1 and 2 exhibit similar centrosymmetric structure, which consists of one transition metal (TM) ion sandwiched by two same subunits {Mo₂O₅(O₃PCH₃C(O)PO₃)}. The clusters 1 and 2 show efficient catalytic activities for oxidation of thioanisole. Moreover, they are catalytically selective for oxidizing thioanisole. Both resuable polyoxomolybdates 1 and 2 catalysts show good thermo- and hydrolytic stability. It is noted that compound 1 shows outstanding catalytic activity for oxidation of various sulfides to corresponding sulfones with 93-100% selectivity at 97-100% conversion in one hour under mild conditions, which is potentially valuable to the removal of organic sulfides.
TL;DR: Two new clusters of structurally isolated organometallic POM-based clusters were successfully nanostructured onto Ni foam and electrochemically reduced after 48 h of electrolysis to M/MoO2, where M = Rh (3) and Ir (4), nanocomposite hybrid materials on a Ni foam surface in a 0.1 M KOH solution.
Abstract: Polyoxometalates (POMs), emerging as a new class of porous molecular materials, play a promising role in homo- and heterogeneous catalysis. Among them, noble-metal-decorated POMs have a profound impact as catalytic materials. Thus, it is imperative to design and structurally explore new catalysts including noble metals. Herein, two new clusters, H3[(Cp*Rh)4PMo8O32]·14H2O (1) and H5[Na2(Cp*Ir)4PMo8O34]·13H2O (2) (Cp* = pentamethylcyclopentadienyl), based on a heterooctamolybdate anionic core were successfully obtained via a one-pot reaction using [Cp*MCl2]2 [M = Rh (1) and Ir (2)] and Na2MoO4 in acidic conditions. Compounds 1 and 2 were well characterized in the solid state by single-crystal X-ray diffraction, IR, and thermogravimetric analysis and in solution by UV–vis, electrospray ionization mass spectrometry, and electrochemistry. Compounds 1 and 2 represent an important class of structurally isolated organometallic POM-based clusters that were successfully nanostructured onto Ni foam and electrochemic...
TL;DR: Eight new lanthanide derivatives containing 6-peroxoniobio-4-phosphate building block have been successfully obtained using an in-situ strategy and fully characterized in the solid state by single-crystal X-ray diffraction, IR spectra, TG-MS, PXRD.
Abstract: Eight new lanthanide derivatives containing 6-peroxoniobio-4-phosphate building block, [LnIII(H2O)6]2[H4(NbO2)6P4O24]·nH2O [Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), Tm (7), Yb (8), 1–5, 7, 8 n = 12; 6 n = 9], have been successfully obtained using an in-situ strategy and fully characterized in the solid state by single-crystal X-ray diffraction, IR spectra, TG-MS, PXRD. Structural analyses indicate that these isostructural polyanions 1–8 consist of one [P4(NbO2)6O24]10− (P
4
(NbO
2
)
6
) clusters and two pendant Ln3+ cations. In these compounds, P
4
(NbO
2
)
6
clusters are connected by lanthanide cations to form extended two-dimensional architectures. The approach takes advantage of the ability of in-situ formed P
4
(NbO
2
)
6
cluster to build frameworks by using it as ligands to lanthanide ions. The photoluminescence (PL) and lifetime decay behaviors of 1, 3 and 4 in solid state have been performed at room temperature. The PL emission of 1, 3 and 4 is mainly derived from the characteristic 5D0→7FJ (J = 1, 2, 3, 4), 5D4→7FJ (J = 6, 5, 4, 3) and 4F9/2→6H J (J = 15/2, 13/2, 11/2) transitions of the EuIII, TbIII and DyIII cations, respectively.
TL;DR: In this article, four structurally novel transition-metal-bridging risedronate-based polyoxomolybdates (Ris-based PODs) have been presented through conventional aqueous solution and characterized by single crystal X-ray diffraction and PXRD, SEM images and EDX analyses, IR and UV spectra, elemental analyses and Xray photoelectron spectroscopy.
TL;DR: Two novel heteropolyoxomolybdate-based organometallic compounds 1 and 2 represent rare examples of transition metal sandwich-based polyoxometalate metal carbonyl derivatives (PMCDs), in which the organic-inorganic hybrids are composed of four Mn(CO)3+ groups symmetrically occupied the tetravacant sites of dimeric heteropolyxomoly bdate through MnI-O-Mo bonds.
Abstract: Two novel heteropolyoxomolybdate [XMo₈O31]n- (X = Ge(1) or P(2)) manganese carbonyl derivatives [(CH₃)₄N]₆H₆{MnII(GeMo₈O31)[MnI(CO)₃]₂}₂·12H₂O (1) and [(CH₃)₄N]₄H₆{MnII(PMo₈O31)[MnI(CO)₃]₂}₂·14H₂O (2), have been successfully synthesized and characterized in the solid state by single crystal X-ray diffraction, IR and thermogravimetric analysis, and in solution by UV-Vis spectroscopy and electrochemistry. The two polyoxomolybdate-based organometallic compounds 1 and 2 represent rare examples of transition metal sandwich-based polyoxometalate metal carbonyl derivatives (PMCDs), in which the organic-inorganic hybrids are composed of four Mn(CO)₃⁺ groups symmetrically occupied the tetravacant sites of dimeric heteropolyoxomolybdate {Mn₂(XMo₈O31)₂}n- through MnI-O-Mo bonds. The carbonyl functionalized Mn atoms are octahedrally coordinated via three μ₂-oxygens of the [XMo₈O31]n- unit and three carbonyl carbon atoms. Interestingly, 1 and 2 form a psedocuboidal ring Mn(CO)₃Mo₃O12 with {Mn(CO)₃}⁺ occupying the three fold axis of the Mo₃O12 octahedral triad. Beside this, the two centrally placed adjacent MnII atoms show intramolecular Mn∙∙∙Mn interactions of 3.11 and 3.16 A in 1 and 2, respectively. Significant n→π* and O···O intermolecular interactions between the orthogonally aligned adjacent carbonyl groups through the overlap of lone-pair electrons on oxygen atoms with the antibonding orbital (π*) of the adjacent carbony carbon atom of the subsequent units in 1 and 2 were observed. The electrochemical properties of the two compounds were also been investigated.
TL;DR: In this article, two inorganic-organic hybridized polyoxomolybdates, Cs8NaH [(SeMo6O21)C6H3O3(CH2CO2)3]2·10H2O (1) and Cs 8H4 [(AsMo6OnO21]C6h3O 3(CH 2CO2), 2·10 H2O(2), functionalized by a flexible tri-podal multicarboxylic ligand 1,3,5-tris (carboxymeth
TL;DR: In this article, a novel organic-inorganic hybrid polyoxometalate-based 3D framework has been synthesized by the metastable precursor [As 2 W 19 O 67 (H 2 O)] 14−, which was further characterized by IR spectrum, thermogravimetric analysis (TGA), and X-ray single-crystal diffraction.
TL;DR: Two magnetic 2D inorganic-organic hybrid phosphotungstates, K2(H2dap)4[Cu(dap)]2]{Cu(A-α-PW9O34)2[cu(dAP)]2}·6H2O (1) and [Cu(Dap)2]H2{Cu[Cu/dap]Cu/Dap]2[A]-PW/PW 9O34] 2[cu/DAP]2] 2]
Abstract: Two magnetic 2D inorganic–organic hybrid phosphotungstates, K2(H2dap)4[Cu(dap)2]{Cu(A-α-PW9O34)2[Cu(dap)]2}·6H2O (1) and [Cu(dap)2]H2{Cu[Cu(dap)Cu(dap)2(A-α-PW9O34)]2[Cu(dap)]2}·4H2O (2) (dap = 1,3-diaminopropane) have been synthesized and well-characterized. Both 1 and 2 show a 2D layer-like framework with the (4, 4)-connected topological network based on 1D sinusoidal chain-like structure. The studies of magnetic properties indicate that 1 and 2 are indicative of a typical antiferromagnetic coupling between Cu2+ cations.
TL;DR: A new Cr-containing tungstophosphate [(Cr(H2O)2)3(H 2P2W12O48)3]27]− (1a) was prepared via simple, one-pot reaction method, which was isolated as hydrated potassium salt as discussed by the authors.