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Jiawei Liu, Zhi Wang, Yuming Cai, Mohamedally Kurmoo, Quanqin Zhao, Xingpo Wang, Chen-Ho Tung, Di Sun
The reaction of {(HNEt3)2[Ag10(tBuC6H4S)12]}n, Ag2O, Na2MoO4 and m-methoxybenzoic acid (Hmbc) in CH3OH/CH2Cl2 led to only yellow crystals of [Ag4S4(MoO4)5@Ag66] (SD/Ag70b; SD = SunDi), but in the presence of DMF additional dark-red crystals of [Ag10@(MoO4)7@Ag60] (SD/Ag70a) were obtained. The former consists of five MoO42- wrapped by a shell of 66 Ag atoms. The latter contains a rare Ag10 kernel consisting of five tetrahedra sharing faces and edges ringed by seven MoO42- which is enclosed in a shell of 60 Ag atoms...
February 18, 2019: Angewandte Chemie
Xiaoyu Hua, Xingxing Zhou, Shijing Guo, Ting Zheng, Ruo Yuan, Wenju Xu
An electrochemical biosensor is described for highly sensitive determination of tDNA, an Alzheimer's disease (AD)-related biomarker. Electroactive molybdophosphate anions were precipitated in-situ on a glassy carbon electrode (GCE) via catalytic hydrolysis by alkaline phosphatase (ALP). This is followed by recycling amplification of tDNA. Four DNA strands (referred to as S1, S2, S3 and S4) were designed to assemble X-shape DNA (X-DNA) building blocks. These were further extended into four directions under the action of DNA polymerase...
February 4, 2019: Mikrochimica Acta
Yaxing Wang, Yumin Wang, Xing Dai, Wei Liu, Xuemiao Yin, Long Chen, Fuwan Zhai, Juan Diwu, Chao Zhang, Ruhong Zhou, Zhifang Chai, Ning Liu, Shuao Wang
Traditional inorganic X-ray scintillators are designed based on several representative metal ions (e.g., Tl+ , Pb2+ , Bi3+ ) with highly emissive nature and high atomic number aiming at the outstanding radiation stopping power. The combination of these two features gives rise to a high energy conversion efficiency from X-ray to visible emission, which is a prerequisite for an ideal scintillator and is currently one of the major limits for the further development of this field. Inspired by our recent observation on the intrinsic scintillating phenomenon in the heaviest naturally occurring element uranium, we report here a family of inorganic scintillators through combination of uranyl ions with diverse oxoanion groups (i...
January 31, 2019: Inorganic Chemistry
Kai Li, Rik Van Deun
Correction for 'Mutual energy transfer luminescent properties in novel CsGd(MoO4)2:Yb3+,Er3+/Ho3+ phosphors for solid-state lighting and solar cells' by Kai Li et al., Phys. Chem. Chem. Phys., 2019, DOI: 10.1039/c8cp06538a.
January 14, 2019: Physical Chemistry Chemical Physics: PCCP
Ya-Ping Gong, Chun-Li Hu, Fang Kong, Jiang-Gao Mao
The first examples of bismuth fluoride selenites with d0-TM/Te(VI) polyhedrons, namely, Bi4TiO2F4(SeO3)4 (1), Bi4NbO3F3(SeO3)4 (2), Bi4TeO4F2(TeO3)2(SeO3)2 (3), Bi2F2(MoO4)(SeO3) (4) and Bi2ZrO2F2(SeO3)2 (5) have been successfully synthesized under hydrothermal reactions by aliovalent substitution. The five new compounds feature three different types of structures. Compounds 1-3, containing Ti(IV), Nb(V) and Te(VI) respectively, are isostructural, exhibiting a new 3D framework composed of 3D bismuth oxyfluoride architecture with intersecting tunnels occupied by d0-TM/Te(VI) octahedrons and selenite/tellurite groups...
January 13, 2019: Chemistry: a European Journal
T Groń, M Karolewicz, E Tomaszewicz, M Guzik, M Oboz, B Sawicki, H Duda, Z Kukuła
Scheelite-type Ca1- x Mn x MoO4 ( x  = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n -type electrical conductivity characteristic for insulators and low relative permittivity ( ε r  < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+ -doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO4 , the balance between diamagnetism and paramagnetism for Ca1- x Mn x MoO4 ( x  = 0...
2019: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
Tatyana S Spiridonova, Sergey F Solodovnikov, Aleksandra A Savina, Yulia M Kadyrova, Zoya A Solodovnikova, Vasiliy N Yudin, Sergey Yu Stefanovich, Elena G Khaikina
A new triple molybdate, Rb2 Ag1+3x In1-x (MoO4 )3 (0 ≤ x ≤ 0.02), was found in the course of a study of the system Rb2 MoO4 -Ag2 MoO4 -In2 (MoO4 )3 and was synthesized as both powders and single crystals by solid-state reactions and spontaneous crystallization from melts. The structure of Rb2 Ag1+3x In1-x (MoO4 )3 (x ≉ 0.004) is of a new type crystallizing in the centrosymmetric space group R-3c [a = 10.3982 (9), c = 38.858 (4) Å, Z = 12 and R = 0.0225] and contains (In,Ag)O6 octahedra and distorted Ag1O6 trigonal prisms linked by common faces to form [Ag(In,Ag)O9 ] dimers connected to each other via MoO4 tetrahedra into an open three-dimensional (3D) framework...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Jared M Robertson, Jake A Nesbitt, Matthew B J Lindsay
Fluid petroleum coke generated at oil sands operations in the Athabasca Oil Sands Region of northern Alberta, Canada, contains elevated concentrations of molybdenum (Mo) and other metals including nickel (Ni) and vanadium (V). Solid-phase Mo concentrations in fluid petroleum coke are typically 10 to 100 times lower than V and Ni, yet dissolved Mo concentrations in associated pore waters are often comparable with these metals. We collected pore water and solids from fluid petroleum coke deposits in the AOSR to examine geochemical controls on Mo mobility...
November 12, 2018: Chemosphere
J V B Moura, T S Freitas, R P Cruz, R L S Pereira, A R P Silva, A T L Santos, J H da Silva, C Luz-Lima, H D M Coutinho
This study reports the antibacterial properties and modulation analysis of antibiotic activity by NaCe(MoO4 )2 microcrystals as well as their structural and morphological characterization. Evaluation of the antibacterial and antibiotic-modulating activity was carried out using the broth microdilution method. The Minimum Inhibitory Concentrations (MICs) of the compounds were expressed as the geometric mean of the triplicate values obtained through the use of Resazurin. Compound concentrations in the plates ranged from 512 to 0...
November 13, 2018: Microbial Pathogenesis
Yida Xu, Teng Chen, Tao Wang, Jie Yang, Yan Zhu, Weiping Ding
The catalysts towards the oxygen reduction reaction (ORR) are the key materials for fuel cells and have stimulated continuous investigations on rational designs. Apart from the popular strategies reported, we demonstrate here a facile method resulting in a nanocomposite composed of molybdenum carbide (Mo2C) nanoparticles embedded and buried in Fe-N-doped carbon nanolayers by directly pyrolyzing the mixture of Fe2(MoO4)3 and dicyandiamide. The underlying Mo2C donates electrons of higher energy to the exterior N-containing carbon nanolayers (NC) and strongly couples with the active sites induced by Fe in the NC layer, leading to significant improvement at half-wave potential with respect to the control sample without Mo2C...
November 29, 2018: Nanoscale
Bougar Sarr, Abdou Mbaye, Cheikh Abdoul Khadir Diop, Frederic Melin, Petra Hellwig, Mamadou Sidibé, Yoann Rousselin
The organic-inorganic title salt, (C6 H16 N)2 [MoO4 ] or ( i Pr2 NH2 )2 [MoO4 ], was obtained by reacting MoO3 with diiso-propyl-amine in a 1:2 molar ratio in water. The molybdate anion is located on a twofold rotation axis and exhibits a slightly distorted tetra-hedral configuration. In the crystal structure, the diiso-propyl-ammmonium ( i Pr2 NH2 )+ cations and [MoO4 ]2- anions are linked to each other through N-H⋯O hydrogen bonds, generating rings with R 12 12 (36) motifs that give rise to the formation of a three-dimensional network...
November 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Xiaoxian Zhao, Jiangyan Wang, Ranbo Yu, Dan Wang
Multi-shelled binary metal oxide which can exert a synergetic effect of different oxides, is promising electrochemical electrode material. However, it is challenging to synthesize this kind of binary metal oxides due to the severe hydrolysis and/ or precipitation reactions of the precursors between cations and anions of different metals. Herein, by using citric acid as chelating agent to inhibit the hydrolysis and precipitation reactions, a series of multi-shelled binary metal oxide hollow spheres (Fe2 (MoO4 )3 , NiMoO4 , MnMoO4 , CoWO4 , MnWO4 , etc...
November 15, 2018: Journal of the American Chemical Society
Jie Cheng, Lili Xue, Min Zhu, Jiayin Feng, Jue Shen-Tu, Jianming Xu, Philip C Brookes, Caixian Tang, Yan He
An anaerobic incubation was launched with varying nitrate (1, 5, 10 and 20 mM exogenous NaNO3 ) and molybdate (20 mM Na2 MoO4 , a sulfate-reducing inhibitor) additions to investigate the characteristics of PCP dechlorination, as well as the reduction of natural co-occurring electron acceptors, including NO3 - , Fe(III) and SO4 2- , and the responses of microbial community structures under a unique reductive mangrove soil. Regardless of exogenous addition, nitrate was rapidly eliminated in the first 12 days...
January 2019: Environmental Pollution
Li Wang, Yuanchuan He, Yanlin Mu, Mengjiao Liu, Yuanfu Chen, Yan Zhao, Xin Lai, Jian Bi, Daojiang Gao
A facile sol-gel process was used for synthesis of LiFe(MoO4 )2 microcrystals. The effects of sintering temperature on the microstructures and electrochemical performances of the as-synthesized samples were systematically investigated through XRD, SEM and electrochemical performance characterization. When sintered at 650°C, the obtained LiFe(MoO4 )2 microcrystals show regular shape and uniform size distribution with mean size of 1-2 μm. At the lower temperature (600°C), the obtained LiFe(MoO4 )2 microcrystals possess relative inferior crystallinity, irregular morphology and vague grain boundary...
2018: Frontiers in Chemistry
Maria Väätäjä, Hanna Kähäri, Katja Ohenoja, Maciej Sobocinski, Jari Juuti, Heli Jantunen
This paper presents for the first time the fabrication of dielectric ceramic parts by 3D printing without sintering. The printable paste was prepared by mixing a carefully selected amount of water-soluble Li2 MoO4 powder with water. A viscous mixture of solid ceramic particles and saturated aqueous phase was formed with a solid content of 60.0 vol.%. Printing of the sample discs was conducted with material extrusion using a low-cost syringe-style 3D printer. The consolidation and densification of the printed parts occurred during both printing and drying of the paste due to extrusion pressure, capillary forces, and recrystallization of the dissolved Li2 MoO4 ...
October 29, 2018: Scientific Reports
Juliane Poppe, Steffen Brünle, Ron Hail, Katharina Wiesemann, Klaus Schneider, Ulrich Ermler
A continuous FeMo-cofactor supply for nitrogenase maturation is ensured in Azotobacter vinelandii by developing a cage-like molybdenum storage protein (MoSto) capable to store ca. 120 molybdate molecules (MoO4 2- ) as discrete polyoxometalate (POM) clusters. To gain mechanistic insight into this process MoSto was characterized by Mo and ATP/ADP content, structural and kinetic analysis. We defined three functionally relevant states specified by the presence of both ATP/ADP and POM clusters (MoStofunct ), of only ATP/ADP (MoStobasal ) and of neither ATP/ADP nor POM clusters (MoStozero ), respectively...
October 27, 2018: FEBS Journal
István E Sajó, László P Bakos, Imre M Szilágyi, György Lendvay, József Magyari, Miklós Mohai, Ágnes Szegedi, Attila Farkas, Anna Jánosity, Szilvia Klébert, László Kótai
[NH4 Cu(OH)MoO4 ] as active photocatalyst in the decomposition of Congo Red when irradiated by UV or visible light has been prepared in an unusual ammonia/water ligand exchange reaction of [tetraamminecopper(II)] molybdate, [Cu(NH3 )4 ]MoO4 . [Cu(NH3 )4 ]MoO4 was subjected to moisture of open air at room temperature. Light blue orthorhombic [Cu(NH3 )(H2 O)3 ]MoO4 was formed in 2 days as a result of an unexpected solid/gas phase ammonia-water ligand exchange reaction. This complex does not lose its last ammonia ligand on further standing in open air; however, a slow quasi-intramolecular (self)-protonation reaction takes place in 2-4 weeks, producing a yellowish-green microcrystalline material, which has been identified as a new compound, [NH4 Cu(OH)MoO4 ], ( a = 10,5306 Å, b = 6...
November 5, 2018: Inorganic Chemistry
J V B Moura, C Luz-Lima, G S Pinheiro, P T C Freire
Temperature-dependent Raman spectroscopic study has been performed on scheelite-type sodium‑cerium molybdate - NaCe(MoO4 )2 - in the temperature range 113-873 K. This study provides phonon properties of NaCe(MoO4 )2 , which are very important to understand the mechanism governing eventual phase transitions undergone by the structure, since phonons are very sensitive to structural changes. The ambient scheelite phase remains stable in a low-temperature range (113-293 K), and no relevant modification is observed in the Raman spectra...
February 5, 2019: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Xiaoxuan Ge, Brian J Vaccaro, Michael P Thorgersen, Farris L Poole, Erica L Majumder, Grant M Zane, Kara B De León, W Andrew Lancaster, Ji Won Moon, Charles J Paradis, Frederick von Netzer, David A Stahl, Paul D Adams, Adam P Arkin, Judy D Wall, Terry C Hazen, Michael W W Adams
Anthropogenic nitrate contamination is a serious problem in many natural environments. Nitrate removal by microbial action is dependent on the metal molybdenum (Mo), which is required by nitrate reductase for denitrification and dissimilatory nitrate reduction to ammonium. The soluble form of Mo, molybdate (MoO4 2- ), is incorporated into and adsorbed by iron (Fe) and aluminum (Al) (oxy)hydroxide minerals. Herein we used Oak Ridge Reservation (ORR) as a model nitrate-contaminated acidic environment to investigate whether the formation of Fe- and Al- precipitates could impede microbial nitrate removal by depleting Mo...
October 5, 2018: Environmental Microbiology
Wentao Dang, Xiaoya Wang, Jiayi Li, Cuijun Deng, Yaqin Liu, Qingqiang Yao, Liming Wang, Jiang Chang, Chengtie Wu
When osteochondral tissues suffer from focal or degenerative lesions caused by trauma or disorders, it is a tough challenge to regenerate them because of the limited self-healing capacity of articular cartilage. In this study, a series of Mo-doped bioactive glass ceramic (Mo-BGC) scaffolds were prepared and then systematically characterized. The released MoO4 2- ions from 7.5Mo-BGC scaffolds played a vital role in regenerating articular cartilage and subchondral bone synchronously. Methods: The Mo-BGC scaffolds were fabricated through employing both a sol-gel method and 3D printing technology...
2018: Theranostics
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