A5037763447- Polyoxometalates: Synthesis and Applications
- Chemical Synthesis and Characterization
- Metal-Organic Frameworks: Synthesis and Applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Crystal Structures and Properties
- Transition Metal Oxide Nanomaterials
- DNA and Nucleic Acid Chemistry
- Molecular Junctions and Nanostructures
- Catalysis and Oxidation Reactions
- Magnetic properties of thin films
- Atomic and Subatomic Physics Research
- Semiconductor Quantum Structures and Devices
- Advanced biosensing and bioanalysis techniques
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Microfluidic and Capillary Electrophoresis Applications
- Arsenic contamination and mitigation
- Solid-state spectroscopy and crystallography
- Gas Sensing Nanomaterials and Sensors
- NMR spectroscopy and applications
- Inorganic Fluorides and Related Compounds
- Surface and Thin Film Phenomena
- Organic Electronics and Photovoltaics
Virginia Tech
2011-2023
Ohio University
2000-2004
National High Magnetic Field Laboratory
1997-2000
Syracuse University
1993-1998
Florida State University
1997
University of New Orleans
1994-1996
Princeton University
1994
Very complicated inorganic solids can be self-assembled from structurally simple precursors as illustrated by the hydrothermal synthesis of vanadium phosphate, [(CH(3))(2)NH(2)]K(4)[V(10)O(10)(H(2)O)(2)(OH)(4)(PO(4))(7)].4H(2)O, 1, which contains chiral double helices formed interpenetrating spirals oxo pentamers bonded together P(5+). These are in turn intertwined with each other a manner that generates unusual tunnels and cavities filled (CH(3))(2)NH(2)(+) K(+) cations, respectively. The...
Depending on the tether length of diphosphonate group, hydrothermal reactions VCl4 with diphosphonic acids class (H2O3P)(CH2)n(PO3H2) in presence templating organic cations yield one-, two-, and three-dimensional framework structures V-O-RPO system. The picture shows a section [H3N(CH2)2NH3][(VO)4(OH)2(H2O)2{O3P(CH2)3PO3}2]·4H2O.
Large cavities with segregated hydrophobic and hydrophilic domains result from the inclusion of inorganic organic canons in hydrothermal synthesis blue compound 1. Its structure is shown picture on right.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Syntheses and Crystal Structures of Two Oxovanadium-Organodiphosphonate Phases: [H2N(C2H4)2NH2][(VO)2(O3PCH2CH2CH2PO3H)2], a "Stair-Step" Structure Incorporating an Organic Cationic Template, [(VO)(H2O){O3PCH2NH(C2H4)2NHCH2PO3}], Layered "Pillared" by Piperazinium-Tethered DiphosphonateVictoria Soghomonian, Roberto Diaz, Robert C. Haushalter, Charles J. O'Connor, Jon ZubietaCite this: Inorg. Chem. 1995, 34, 17, 4460–4466Publication...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganically templated open-framework vanadium phosphates: hydrothermal synthesis, structure, and magnetic properties of H3N(CH2)3NH3[(VO)3(OH)2(H2O)2(PO4)2]V. Soghomonian, Qin Chen, Robert C. Haushalter, Jon Zubieta, Charles J. O'Connor, Y. S. LeeCite this: Chem. Mater. 1993, 5, 12, 1690–1691Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(H2NC4H8NH2)[(VO)2(PO4)2] and (H2NC4H8NH2)2[(VO)3(HPO4)2(PO4)2].cntdot.H2O: Novel Layered Vanadium Phosphates with Distorted Defected VOPO4 LayersVictoria Soghomonian, Robert C. Haushalter, Qin Chen, Jon ZubietaCite this: Inorg. Chem. 1994, 33, 8, 1700–1704Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Syntheses and Structural Characterization of Layered Oxovanadium Phosphate Solids Incorporating Organic Cations: [H2N(C4H8)NH2][(VO)4(OH)4(PO4)2], [(NH3C3H6)NH(C2H4)2NH(C3H6NH3)][(VO)5(OH)2(PO4)4].cntdot.2H2O, [HN(C2H4)3NH]2[(VO)8(HPO4)3(PO4)4(OH)2].cntdot.2H2O, [HN(C2H4)3NH][(VO)3(OH)2(PO4)2]Victoria Soghomonian, Qin Chen, Robert C. Haushalter, Charles J. O'Connor, Cuihong Tao, Jon ZubietaCite this: Inorg. Chem. 1995, 34, 13,...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis and Structural Characterization of V(III)-Containing Phases the Vanadium Organodiphosphonate System. Crystal Structures V(III) Species (H3O)[V3(O3PCH2CH2PO3)(HO3PCH2CH2PO3H)3] Mixed Valence V(III)/V(IV) Material (H3O)2[(VO)V2(OH)2(O3PCH2CH2PO3)2].cntdot.H2OVictoria Soghomonian, Robert C. Haushalter, Jon ZubietaCite this: Chem. Mater. 1995, 7, 9, 1648–1654Publication Date (Print):September 1, 1995Publication History Published...
We report on current–voltage characteristics obtained at room temperature λ-DNA molecules, modified both ends with disulfide groups and spanning Au electrodes. A comparison is drawn between the of λ-DNA, which after modification features a gap 3′ 5′ sites (nicked DNA), where this has been ligated (repaired DNA). The repaired DNA double helices show close-to-linear characteristic, dc conductivity estimated ∼1×10−3 S cm−1. In contrast, nicked shows pronouncedly nonlinear rectifying behavior,...
The title compound (NH4)VOPO4, (1), was synthesized hydrothermally from a mixture of CsVO3, V, CH3PO3H2, (NH4)2HPO4, (C2H5)3CH3NBr, and H2O in the mole ratios 3.96:1:4.88:11.97:4.96:1498. Phosphate (1) crystallizes orthorhombic space group Pnn2 with = 10.5119(2) Å, b 12.917(3) c 6.462(1) V 877.3(4) Z 4, R 0.043. framework consists one-dimensional chains corner-sharing VO6 octahedra joined together by phosphate tetrahedra which generates cation filled tunnels running parallel to axis, There...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA square-pyramidal tetrahedral vanadium phosphate framework solid incorporating propanediammonium dications. The structural characterization of (H3NCH2CH2CH2NH3)K[(VO)3(PO4)3]Victoria Soghomonian, Qin Chen, Robert C. Haushalter, and Jon ZubietaCite this: Chem. Mater. 1993, 5, 11, 1595–1597Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November...
The new vanadium phosphate H2N(CH2CH2)2NH2[(VO)4(H2O)4(HPO4)2(PO4)2], (1), was prepared from the reaction of VCl4:H3PO4:1,4-diaminopiperazine hydrochloride:tetra-n-buytlammonium hydroxide:H2O in a mole ratio 1:8.9:4.4:5.2:2268 sealed glass tube for 3 h at 200 °C. Phosphate 1 crystallizes acentric monoclinic space group Im with = 7.025(1), b 9.470(2), and c 16.570(3)Å, β 96.03(3)°, V 1096.3 (6) Å3, Z 2, R (Rw) 0.0517 (0.0595) possesses three dimensional (3-D) covalently bonded structure...
Große Hohlräume mit separierten hydrophilen und hydrophoben Regionen bilden sich beim Einschluß von anorganischen organischen Kationen in der blauen Verbindung 1 , die durch Hydrothermal‐synthese hergestellt wurde. Das Bild rechts zeigt Struktur. magnified image equation
Abstract Quantum interference is used to measure the spin interactions between an InAs surface electron system and iron center in biomolecule hemin nanometer proximity a bio-organic/semiconductor device structure. The quantifies influence of on decoherence properties electrons. times electrons serve characterize biomolecule, electronic complement use magnetic resonance. Hemin, prototypical for heme group hemoglobin, demonstrate method, as representative where state metal ion affects...
We present the electrical characterization of a zeolitelike oxo-vanadium arsenate framework. The experimentally obtained electronic and ionic conductivities their interactions are discussed. Further, we investigate potential use electrically conducting materials in energy storage applications, light material’s structural characteristics.
Resistive magnets offer very high field strengths, unmatched by superconducting technology. However, the spatial and temporal characteristics of raw magnetic fields generated resistive powered water cooled magnets, are unadapted to most nuclear resonance (NMR) experiments. The National High Magnetic Field Laboratory has installed a 24 T (∼1 GHz 1H), 32 mm bore, 13 MW magnet study feasibility utilizing such for NMR applications. Herein we present our efforts in identifying, characterizing,...
Gallium arsenate dihydrate is a member of class isostructural compounds, with the general formula M3+AsO4·2H2O (M3+ = Fe, Al, In, or Ga), which are being considered as potential solid-state storage media for sequestration toxic arsenic cations. We report first high-pressure structural analysis metal dihydrate, namely, GaAsO4·2H2O. This compound crystallizes in orthorhombic space group Pbca Z 8. Accurate unit cell parameters function pressure were obtained by single-crystal X-ray diffraction,...
We study submicron organic field effect transistors with a pentacene channel, and observe either p-type or n-type behaviour under different gate drain voltage conditions. Transistor structures of 0.8 µm channel lengths were fabricated by evaporating Au on tilted substrate, featuring an oxide step. When the step structure, edge is used as shadow mask to ensure gap between source drain. Current–voltage characteristics reveal that positive voltages increase current, when lower contact operated...
We show that antilocalization measurements can be used to experimentally study the interactions between InAs surface electrons and local moments of rare earth ions Sm${}^{3+}$, Gd${}^{3+}$, Ho${}^{3+}$ on surface. Magnetic spin-flip scattering spin-orbit accumulation layer are affected by proximity ions. The rate carries information about magnetic interactions. Within temperature range studied, Sm${}^{3+}$ Gd${}^{3+}$ yield temperature-independent electron rates in proportion their moments....
In this contribution we report the re-determination of crystal structure a previously reported anionic oxo-vanadium arsenate framework [(As6VIV12VV3O51)−9]∞ (1) with piperazinium counterions; also present supporting spectroscopic and elemental data.
Nuclear spin polarization induced by hyperfine interaction and the Edelstein effect due to strong spin-orbit is investigated quantum transport in Bi(111) thin film samples. The films are deposited on mica van der Waals epitaxial growth. show micrometer-sized triangular islands with 0.39 nm step height, corresponding bilayer height. At low temperatures a high current density applied generate non-equilibrium carrier at surface, which then induces dynamic nuclear interaction. Comparative...