Hydrothermal Synthesis, Characterization and Electrocatalytic/Photocatalytic Activities of New Polyoxometalate Based Hybrid Compound

Cheng, Xue; Li, Shuxian; Zhang, Lei; Sha, Jingquan; Zheng, Tao-Ye; Zhang, Qian‐Nan; Li, Liang

doi:10.1007/s10904-013-9951-5

Cited by 13 publications

(8 citation statements)

References 40 publications

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“…Tungstate ceramic materials are mixed oxides that can be used in numerous technological applications such as humidity sensors [1], photocatalysts [2] electrochromic devices [3], Raman converters [4], scintillators [5], photoluminescent materials [6] and lasers [7–8]. α -Ag 2 WO 4 can be considered an example of a high-dimensional and high-connected polyoxometalate-based hybrid compound [9–10] Pang et al prepared superfine Ag 2 WO 4 antibacterial powders with good antimicrobial durability [11] and using α -Ag 2 WO 4 as a starting material, prepared an Ag/AgBr/WO 3 .H 2 O composite that exhibited good photocatalytic activity for the destruction of Escherichia coli bacteria under visible light and that was relatively stable under repeated use. [12].…”

Section: Introductionmentioning

confidence: 99%

Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence

Santana

Gomes

Matos

et al. 2014

Nanomaterials and Nanotechnology

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Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 °C) and co-precipitation (pH 4, 70 °C), and were then used to prepare two core/shell composites, namely α-Ag2WO4/ β-Ag2MoO4 (MAH, pH 4, 140 °C) and β-Ag2MoO4/ β-Ag2WO4 (co-precipitation, pH 4, 70 °C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the β-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure β-Ag2WO4, while co-precipitation afforded the metastable β-Ag2WO4 allotrope, coexisting with a weak amount of the α;-phase. The optical gap of β-Ag2WO4 (3.3 eV) was evaluated for the first time. In contrast to β-Ag2MoO4/ β-Ag2WO4, the α-Ag2WO4/ β-Ag2MoO4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures.

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Section: Introductionmentioning

confidence: 99%

Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence

Santana

Gomes

Matos

et al. 2014

Nanomaterials and Nanotechnology

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“…Besides this multicomponent approach, we also pursued the development of novel complexes with Cu, looking for synergistic effects with the metal. Also, Ag was used in our studies and an Ag-pipemidic acid MOF previously prepared by time-consuming solution methods 51,52 was reproduced with higher yields and short reaction time by mechanochemistry.…”

Section: Resultsmentioning

confidence: 99%

“…Based on our results and a thorough search in the Cambridge Structural Database (CSD), 40,41 we were able to identify two PA polymorphic forms, 42 two polymorphs of the trihydrate derivative 43,44 and two salts, pipemidic acid hydrochloride 45 and pipemidic acid:1,2,4,5-benzenetetracarboxylic acid. 46 Also several metal complexes and metal–organic frameworks, 47,48 enclosing cadmium, 49 nickel, 50 silver, 51,52 zinc, 53–56 manganese, 54,57 cobalt 54 and copper 58–61 were reported.…”

Section: Introductionmentioning

confidence: 99%

From pipemidic acid molecular salts to metal complexes and BioMOFs using mechanochemistry

et al. 2021

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“…Similarly, the 3D Mo/O/Mn II /tetrazole compound [Mn(pytz) Mo 2 O 7 ] appears to be the only example where a tetrazole moiety bridges adjacent Mo centers (in this case, the tetrazolate anion adopts a bridging µ 1,2,3,4 coordination mode to simultaneously connect two Mo atoms and two Mn atoms, with the pyridyl nitrogen left uncoordinated) [20]. In other related organic-inorganic hybrids based on isopolymolybdate anions, [Mo x O y ] n− [35][36][37], or Keggin-type anions, [XMo 12 O 40 ] n− (X = P, Ge) [16,17,38,39], the pytz − ligand coordinates exclusively with the secondary metal (Ag or Cu) to generate binuclear or polymeric (1D/2D) metal-organic subunits that interlink with the polyoxoanions. The rarity of Mo-(H)pytz binding contrasts quite sharply with the numerous compounds known containing Mo atoms coordinated to the structurally analogous pyrazole derivative, i.e., 2-[3(5)-pyrazolyl]pyridine (pypz).…”

Section: Introductionmentioning

confidence: 99%

A 5-(2-Pyridyl)tetrazolate Complex of Molybdenum(VI), Its Structure, and Transformation to a Molybdenum Oxide-Based Hybrid Heterogeneous Catalyst for the Epoxidation of Olefins

Nunes

Gomes

et al. 2021

Catalysts

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There is a considerable practical interest in discovering new ways to obtain organomolybdenum heterogeneous catalysts for olefin epoxidation that are easier to recover and reuse and display enhanced productivity. In this study, the complex salt (H2pytz)[MoO2Cl2(pytz)] (1) (Hpytz = 5-(2-pyridyl)tetrazole) has been prepared, structurally characterized, and employed as a precursor for the hydrolysis-based synthesis of a microcrystalline molybdenum oxide/organic hybrid material formulated as [MoO3(Hpytz)] (2). In addition to single-crystal X-ray diffraction (for 1), compounds 1 and 2 were characterized by FT-IR and Raman spectroscopies, solid-state 13C{1H} cross-polarization (CP) magic-angle spinning (MAS) NMR, and scanning electron microscopy (SEM). Compounds 1 and 2 were evaluated as olefin epoxidation catalysts using the model reaction of cis-cyclooctene (Cy8) with tert-butyl hydroperoxide (TBHP), at 70 °C, which gave 100% epoxide selectivity up to 100% conversion. While 1 behaved as a homogeneous catalyst, hybrid 2 behaved as a heterogeneous catalyst and could be recovered for recycling without showing structural degradation or loss of catalytic performance over consecutive reaction cycles. The substrate scope was broadened to monoterpene DL-limonene (Lim) and biobased unsaturated fatty acid methyl esters, methyl oleate (MeOle), and methyl linoleate (MeLin), which gave predominantly epoxide products.

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Hydrothermal Synthesis, Characterization and Electrocatalytic/Photocatalytic Activities of New Polyoxometalate Based Hybrid Compound

Cited by 13 publications

References 40 publications

Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence

Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence

From pipemidic acid molecular salts to metal complexes and BioMOFs using mechanochemistry

A 5-(2-Pyridyl)tetrazolate Complex of Molybdenum(VI), Its Structure, and Transformation to a Molybdenum Oxide-Based Hybrid Heterogeneous Catalyst for the Epoxidation of Olefins

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