Hydrothermal Synthesis and Structural Characterization of the Two New Vanadium Arsenates H2NC4H8NH2[(VIVO)2(HAsO4)2(H2AsO4)2] and H3NCH2CH2NH3[VIII(HAsO4)2(H2AsO4)].cntdot.H2O

Haushalter, Robert C.; Wang, Zhanwen; Meyer, Linda M.; Dhingra, Sandeep S.; Thompson, Mark E.; Zubieta, Jon

doi:10.1021/cm00045a001

Cited by 45 publications

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“…The intense investigations by many researchers during the last decade or so have given rise to new arsenates of different compositions and structures. Thus, arsenates of aluminum, [6,7] gallium, [8Ϫ10] molybdenum, [11,12] vanadium, [13Ϫ18] iron [19Ϫ24] and zinc [25Ϫ27] have been prepared and their structures reported in the literature. In order to expand the family of known arsenate framework structures, we have been investigating the formation of iron arsenates in the presence of structure-directing organic amine molecules.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure

et al. 2003

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The reaction of FeCl3·6H2O, H3AsO4, HF and 1,4‐bis(3‐aminopropyl)piperazine under solvothermal conditions gives rise to a new iron arsenate, [C10N4H28][{FeF(OH)(HAsO4)}4] (I) with a layered structure. The cell parameters are monoclinic, space group = P21/n (no.14), M = 1143.08, a = 9.6320(3), b = 8.3598(3), c = 10.7794(1) Å, β = 115.036(1)°, V = 786.42(4) Å3, Z = 4, R1 = 0.0492, wR2 = 0.1227 [1114 observed reflections with I > 2σ(I)]. The connectivity between FeO3F2(OH) octahedra and HAsO4 tetrahedra forms a secondary building unit (SBU) of the type SBU‐4. The SBU‐4 units are linked together to form a layer structure with apertures formed by 8‐T atoms (T = Fe, As). The amine molecules are disordered and occupy the inter‐lamellar region. To the best of our knowledge, I is the first example of an iron arsenate structure formed from only one type of secondary building unit, SBU‐4. A dimer model has been used to describe the magnetic behavior. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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Section: Introductionmentioning

confidence: 99%

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure

et al. 2003

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“…Among these, the arsenates are interesting because, although arsenic belongs to the same group as phosphorous, the larger size of the AsO 4 3-anion can give rise to different structures and/or physical properties. Consequently, many arsenate containing frameworks with different structure and composition, have been prepared and characterized [12,[15][16][17][18][19][20].…”

Section: -Introductionmentioning

confidence: 99%

Vanadyl arsenates as catalysts for selective oxidation of organic sulfides and alkenes

Berrocal

Larrea

Iglesias

et al. 2011

Journal of Molecular Catalysis A: Chemical

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Two vanadyl arsenates templated with ethylendiamonium (EnVAs) and piperazonium (PipVAs) were evaluated as catalysts for the oxidation of thioethers and alkenes, using H 2 O 2 and t-butyl hydroperoxide (TBHP) as oxidants. The intrinsic activity of EnVAs was higher than that of PipVAs for the oxidation of sulfides. Similar results were obtained when using either H 2 O 2 or TBHP as oxidants. However, the sterical effects were enhanced when TBHP was used and higher selectivities towards sulfoxides were achieved with this oxidant. The catalytic activity of the V-based materials in the epoxidation of simple alkenes and allylic alcohols was assessed. Upon reuse, both materials show no significant decrease in their catalytic properties. 1.-INTRODUCTIONOpen-framework metal phosphates are of considerable technological importance as shapeselective catalysts, ion-exchange materials and molecular sieves [1]. Since the discovery of the microporous crystalline aluminophosphates AlPO4-n in 1982[2], a large number of new metal phosphates with open-framework structures have been synthesized [3][4][5][6][7]. These structures contain not only tetrahedrally coordinated atoms but also square pyramidal and octahedral moieties. Among the vast family of open-framework metal phosphates, the transition metal phosphates constitute an important group due to their potential activity as redox catalysts. Out of all the open-framework compounds known, those based on the phosphate oxoanion appear to be the predominant class [8][9][10]. In addition to the use of tetrahedral phosphate groups as building units, other anionic moieties such as borates [11] . In addition, epoxides, produced by the oxidation of olefins, are extremely useful building blocks in the synthesis of organic compounds as they act as excellent intermediates that can yield a great variety of products [27]. When using vanadyl compounds, the catalytically active oxo-peroxo intermediate is formed in situ by oxidation of V(IV) to V(V) with an excess of tert-butyl hydroperoxide, yielding a tert-butyl hydroperoxovanadium(V) complex.In most of the methods described in the literature, pollutants are generated, because of the use of corrosive acids, toxic or dangerous substances [25]. For this reason it is important to develop clean methods which allow obtaining the sulfoxide derivatives and the epoxides without the generation of these undesired substances. In this sense, the use of hydrogen peroxide instead of other oxidants for the oxidation of organic substrates is an interesting alternative because the unique subproduct of the reaction is water. In addition, hydrogen peroxide is highly efficient in its oxygen content and is a cheap reagent. 4The use of open framework phases templated with amines as catalysts in these reactions is especially appealing due to their redox properties, including their acidity [22,23,28,29].During the course of our research, we have synthesized two new catalytic compounds, fluoro- was added dropwise, while the overall suspension was heated at 323...

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“…With the deep study of polyoxometalate chemistry, various metaloxygen materials have been synthesized, one of which is arsenic-vanadate compounds. Up to date, many arsenicvanadium cluster compounds with various crystal structures and properties have been reported [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Such as the compounds with a discrete [As 8 V 14 O 42 ] 4À polyoxoanion, including [As 8 V 14 O 42 (X)] nÀ (X = Cl À , n = 5; X ¼ PO 3À 4 , n = 7) [21,22] anion.…”

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confidence: 99%

Hydrothermal synthesis, characterization and magnetic properties of a new 2D arsenic–vanadate layers supported cobalt coordination complex: [Co(en)2(H2O)]{[Co(en)2]2As8V14O42(SO4)}·3H2O

Zhou

Guo

et al. 2007

Inorganic Chemistry Communications

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Hydrothermal Synthesis and Structural Characterization of the Two New Vanadium Arsenates H2NC4H8NH2[(VIVO)2(HAsO4)2(H2AsO4)2] and H3NCH2CH2NH3[VIII(HAsO4)2(H2AsO4)].cntdot.H2O

Cited by 45 publications

References 0 publications

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure

Vanadyl arsenates as catalysts for selective oxidation of organic sulfides and alkenes

Hydrothermal synthesis, characterization and magnetic properties of a new 2D arsenic–vanadate layers supported cobalt coordination complex: [Co(en)2(H2O)]{[Co(en)2]2As8V14O42(SO4)}·3H2O

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Hydrothermal Synthesis and Structural Characterization of the Two New Vanadium Arsenates H2NC4H8NH2[(VIVO)2(HAsO4)2(H2AsO4)2] and H3NCH2CH2NH3[VIII(HAsO4)2(H2AsO4)].cntdot.H2O

Cited by 45 publications

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Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C10N4H28][{FeF(OH)(HAsO4)}4], with a Layer Structure

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C10N4H28][{FeF(OH)(HAsO4)}4], with a Layer Structure

Vanadyl arsenates as catalysts for selective oxidation of organic sulfides and alkenes

Hydrothermal synthesis, characterization and magnetic properties of a new 2D arsenic–vanadate layers supported cobalt coordination complex: [Co(en)2(H2O)]{[Co(en)2]2As8V14O42(SO4)}·3H2O

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Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure

Synthesis, Structure and Magnetic Properties of a New Iron Arsenate, [C₁₀N₄H₂₈][{FeF(OH)(HAsO₄)}₄], with a Layer Structure