ChemInform Abstract: Crystal Structure of Na9 [H3W12O42]×24H2O, a Compound Containing the Protonated Paratungstate B Anion (′Acid Paratungstate′), and Cyclic Voltammetry of Acidified [H2W12O42]10- Solutions.

ChemInform ◽  
2010 ◽  
Vol 31 (12) ◽  
pp. no-no
Author(s):  
Annette L. Nolan ◽  
Christine C. Allen ◽  
Robert C. Burns ◽  
Geoffrey A. Lawrance ◽  
Eric N. Wilkes ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Paratungstate B

Crystal Structure of Na9[H3W12O42]·24H2O, a Compound Containing the Protonated Paratungstate B Anion ('Acid Paratungstate'), and Cyclic Voltammetry of Acidified [H2W12O42]10- Solutions

1999 ◽  
Vol 52 (10) ◽  
pp. 955 ◽  
Author(s):  
Annette L. Nolan ◽  
Eric N. Wilkes ◽  
Trevor W. Hambley ◽  
Christine C. Allen ◽  
Robert C. Burns ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Hydrogen Atom ◽  
Internal Cavity ◽  
Molecular Orbital Calculations ◽  
Hydrogen Atoms ◽  
Triclinic Space Group ◽  
Electrochemically Active ◽  
Paratungstate B

Crystallization of a solid at pH 4.0 from an aqueous acidified Rh3+–[WO4]2− solution resulted in the isolation of Na9[H3W12O42]·24H 2 O, which contains the protonated paratungstate B anion and which is likely the species identified previously as ‘acid paratungstate’. The compound is triclinic, space group P1– , a 10.603(2), b 12.134(3), c 14.042(3) Å, α 114.78(1), β 101.84(1), γ 108.34(1)˚, V 1432.9(5) Å3 , Z 1, and the structure was solved to an R1 value of 0.0404 (wR 2 0.1108) for 5997 independent observed reflections. The anion exhibits essentially the same isopolytungstate framework as paratungstate B, [H2W12O42]10− , consisting of two W3O13 and two W3O14 structural subunits linked by shared vertices. Bond valence arguments place two of the hydrogen atoms unequivocally in the internal cavity of the anion, with the remaining hydrogen atom also likely located in this cavity, but disordered over several internal oxygen atoms. The protonation of [H2W12O42 ]10− is shown to lead to species that are electrochemically reducible. Extended-HÜckel molecular orbital calculations confirm that protonation of paratungstate B within the internal cavity leads to a change in composition of the LUMO, now based mainly on electrochemically reducible W3O13 as opposed to (essentially) non-reducible W3O14 structural subunits. This results in species that are considerably more electrochemically active than the unprotonated anion. The role of [H3W12O42]9− as an intermediate in the polymerization of [WO4]2− to give the solution form of ψ-metatungstate, [H7W11O40]7− , which crystallizes as [H4W11O38]6− , is also discussed.

Crystal structure of nickel paratungstate B Ni5[W12O40(OH)2]·37H2O

2011 ◽  
Vol 52 (1) ◽  
pp. 111-117 ◽  
Author(s):  
S. V. Radio ◽  
G. M. Rozantsev ◽  
V. N. Baumer ◽  
O. V. Shishkin
Keyword(s):  
Crystal Structure ◽  
Paratungstate B

Crystal structure of sodium-strontium paratungstate B, Na6Sr2[W12O40(OH)2]·24H2O

2013 ◽  
Vol 54 (1) ◽  
pp. 97-103 ◽  
Author(s):  
S. V. Radio ◽  
N. I. Gumerova ◽  
V. N. Baumer
Keyword(s):  
Crystal Structure ◽  
Paratungstate B

Electrochemistry of Oxygenation Catalysts, Part 6 Electrosynthesis, Structure, Analytical and Electrochemical Properties of Monomeric [CoIII(salen)(DMF)2]+ X- Salts (X = PF6, ClO4)

1996 ◽  
Vol 51 (3) ◽  
pp. 388-398 ◽  
Author(s):  
Bernhard Gollas ◽  
Bernd Speiser ◽  
Hartmut Stahl ◽  
Jürgen Sieglen ◽  
Joachim Strähle
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Cyclic Voltammetry ◽  
Crystal Structure Analysis ◽  
Air Oxidation ◽  
Oxidation Of Co ◽  
X Ray ◽  
Reversible Electron Transfer ◽  
Monomeric Structure ◽  
C Nmr

Abstract[CoIII(salen)(DMF)2]+ X- salts [X = PF6, ClO4; salen = bis(salicyliden)ethylendiiminato; DMF = dimethylformamide] have been synthesized by electrochemical and chemical (air) oxidation of CoII(salen). Their monomeric structure with two DMF molecules in the axial positions in both the solid state and DMF solution is shown by X-ray crystal structure analysis, thermal analysis, mass spectroscopy, and 1H and 13C NMR spectroscopy. The electrochemical reduction of the [CoIII(salen)(DMF)2]+ cation is investigated by cyclic voltammetry and com­ pared to the oxidation of the neutral CoII(salen). The redox reaction connecting the cobalt(II) and the cobalt(III) species appears to be a quasi-reversible electron transfer. These properties make the [CoIII(salen)(DMF)2]+ X-salts starting materials for the analysis of the interaction of basic substrates with cobalt(III) species in the context of the biomimetic oxygenation reactions catalyzed by such complexes.

scholarly journals Synthesis of perovskite type NdFeO3 nanoparticles and used as electrochemical sensor for detection of paracetamol

2020 ◽  
Vol 9 (1) ◽  
pp. 866-869
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Limit Of Detection ◽  
Biological Fluids ◽  
Analytical Techniques ◽  
Graphite Powder ◽  
Ferrite Nanoparticles ◽  
Cubic Crystal ◽  
Perovskite Type ◽  
Electro Catalytic Activity

Neodymium ortho-ferrite nanoparticles have been synthesized by using multiple analytical techniques. The synthesized material possesses cubic crystal structure with crystallite size in the range of 40 to 45 nm as characterized by XRD and FESEM techniques. The synthesized nanoparticles were used as electrode modifiers with graphite powder to prepare NdFeO3/GP electrode. The electro-catalytic activity of prepared electrode was examined to determine paracetamol in biological fluids using cyclic voltammetry and differential pulsed voltammetry. The npNdFeO3 based electrodes exhibits noteworthy results in the estimation of paracetamol with a limit of detection (400 nM) with a linearity range between 05 μM to 120 μM.

Equilibrium in the acidified aqueous solutions of tungstate anion: synthesis of Co(II) isopolytungstates. Crystal structure of Co(II) paratungstate B Co5[W12O40(OH)2] · 37H2O

2010 ◽  
Vol 63 (10) ◽  
pp. 1678-1689 ◽  
Author(s):  
Sergii V. Radio ◽  
Maksym A. Kryuchkov ◽  
Elena G. Zavialova ◽  
Vyacheslav N. Baumer ◽  
Oleg V. Shishkin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Aqueous Solutions ◽  
Paratungstate B ◽  
Tungstate Anion

scholarly journals Synthesis, characterization and crystal structure of [Cu2(LH)2]•(ClO4)2. Influence of the weak Cu•••O(perchlorate) interaction on the structure of Cu2N2O2 metallocycle

2014 ◽  
Vol 79 (5) ◽  
pp. 545-556
Author(s):  
Marija Mirkovic ◽  
Nadezda Nikolic ◽  
Dusan Mijin ◽  
Milka Avramov-Ivic ◽  
Agnes Kapor ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Schiff Base ◽  
Ir Spectroscopy ◽  
Metal Complex ◽  
Aprotic Solvent ◽  
Metal Salt ◽  
Protic Solvent ◽  
X Ray Diffraction ◽  
X Ray

The diimine-dioxime ligand, 4,9-diaza-3,10-diethyl-3,9-dodecadiene-2,11-dione bisoxime (LH2), containing a N4 donor set was prepared by Schiff base condensation of 2-hydroxyimino-3-pentanone and 1,4-diaminobutane in two ways: in protic and in aprotic solvent. Higher yield of (LH2) imine was obtained when the synthesis was carried out using protic solvent (C2H5OH) instead of aprotic benzene (78% and 30%, respectively). Cu(II) metal complex of diimine-dioxime was synthesized in CH3OH from metal salt and LH2 in mole ratio 1:1. The isolated complex was characterized by the elemental analysis, IR spectroscopy and cyclic voltammetry. The structure of [Cu2(LH)2]?(ClO4)2 was determined by the single-crystal X-ray diffraction analysis. Comparison with the structurally related diimine-dioxime Cu(II) complexes revealed the influence of the weak Cu???O(perchlorate) interaction on the geometry of the metallocycle.

Synthesis, Crystal Structure and Characterization of [Bis { N,N′ -bis(2-aminoethyl) propane-1,3-diamine} (µ- imidazolato-N,N′)dizinc(II)] Triperchlorate

1999 ◽  
Vol 52 (7) ◽  
pp. 709 ◽  
Author(s):  
Hai-Liang Zhu ◽  
Ye-Xiang Tong ◽  
Jing Zhao ◽  
Xiao-Ming Chen ◽  
Chun-Ying Duan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Title Compound ◽  
Strong Field ◽  
Title Complex ◽  
Monoclinic Space Group ◽  
Coordination Geometry ◽  
Space Group

The title compound [Zn2(2,3,2-tet)2(Im)] (ClO4)3 (C17H43Cl3N10O12Zn2, 2,3,2-tet = N,N′-bis(2- aminoethyl)propane-1,3-diamine, Im = imidazolate anion) consists of an imidazolate-N,N′-bridged binuclear cation and three perchlorate anions. The complex crystallizes in the monoclinic space group C 2 with a 12 . 038(8), b 12 . 245(8), c 11 . 902(3) Å, β 108 . 00(5)°, V 1668 . 6(15) Å3 . The coordination geometry at each zinc(II) centre is approximately square-pyramidal. The Zn . . . Zn separation is 6 . 114(9) Å. Cyclic voltammetry shows two irreversible cathodic waves at − 1 . 00 and − 1 . 08 V/s.c.e., which clearly indicates that coordination of the strong-field ligands provides significant stability to the zinc(II) centre in the title complex.

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