Electron Spin Resonance Study of Some Halomolybdenyl, -tungstenyl, and -vanadyl Complexes in Solution

Kon, Hideo; Sharpless, Norman E.

doi:10.1021/j100873a016

Cited by 100 publications

(25 citation statements)

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“…The ligand nitrogen or hydrogen superhyperfine splittings are not observed on vanadium line. This indicates the unpaired electrons to be in b 2 g orbital (dxy,-2 B 2 ground state) localized in metal, thus excluding the possibility of its interaction with ligands 28 .…”

Section: Electronic Spin Resonance Spectramentioning

confidence: 99%

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Wanale¹,

Pachling²,

Deosarkar³

2013

Chem Sci Trans

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This paper reports the synthesis and characterization of transition metal complexes of newly synthesized 2,5-substituted-1,3,4-oxadiazoles with Cu(II), VO(IV), Ni(II), Zn(II) and Cd(II). The characterization of complexes were done by elemental analysis, UV-Vis, IR, ESR methods as well as the electrical conductance, magnetic susceptibility and thermal studies. The thermal behaviour provided confirmation of the complex composition as well as the number and the nature of water molecules and the intervals of thermal stability. The in vitro qualitative and quantitative antimicrobial activity assay of all the complexes was carried out.

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Section: Electronic Spin Resonance Spectramentioning

confidence: 99%

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Wanale¹,

Pachling²,

Deosarkar³

2013

Chem Sci Trans

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“…38 183 W hyperfine interactions of an order of magnitude similar to those of [W 6 O 19 ] 3− are commonly observed for other compounds where the unpaired electron is clearly localized on a single W site. 39 Spectrum simulations were performed for each of n = 1−6 where n is the number of equivalent tungsten sites over which the unpaired electron is delocalized. Progressively better fits to the experimental spectrum were obtained as n was increased from one to six, with the closest approach to the experimental spectrum of Figure 4a, shown as Figure 4b, being obtained with n = 6 and the g-values, hyperfine interaction, and line width parameters listed in Table 3.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Voltammetric and Spectroscopic Studies of α- and β-[PW₁₂O₄₀]^3–Polyoxometalates in Neutral and Acidic Media: Structural Characterization as Their [(n-Bu₄N)₃][PW₁₂O₄₀] Salts

et al. 2017

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The structure of the Keggin-type β-[PWO] (PW) polyoxometalate, with n-BuN as the countercation, has been determined for the first time by single-crystal X-ray analysis and compared to data obtained from a new determination of the structure of the α-PW isomer, having the same countercation. Analysis of cyclic voltammograms obtained in CHCN (0.1 M [n-BuN][PF]) reveals that the reversible potential for the β-PW isomer always remains ca. 100 mV more positive than that of the α-PW isomer on addition of the acid CFSOH. Simulations of the cyclic voltammetry as a function of acid concentration over the range 0-5 mM mimic experimental data exceptionally well. These simulation-experiment comparisons provide access to reversible potentials and acidity constants associated with α and β fully oxidized and one- and two-electron reduced systems and also explain how the two well-resolved one-electron W(VI)/W(V) processes converge into a single two-electron process if sufficient acid is present. W NMR spectra of the oxidized forms of the PW isomers are acid dependent and in the case of β-PW imply that the bridging oxygens between the W and W units are preferentially protonated in acidic media. EPR data on frozen solutions of one-electron reduced β-[PWWO] indicate that either the W or the W unit in β-PW is reduced in the β-[PWO]/β-[PWWO] process. In the absence of acid, reversible potentials obtained from the α- and β-isomers of PW and [SiWO] exhibit a linear relationship with solvent properties such as Lewis acidity, acceptor number, and polarity index.

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“…Die Verbindung ist paramagnetisch und zeigt einen fur W(+V) in tetragonal gestaucht oktaedrischer Umgebung typischen achsialen g-Tensor mit dem Komponenten g,l = 1,793 und gl = 1,763. Der Mittelwert g = 1,773 stimmt genau mit dem des [WOC1,]2°-Ions iiberein [19]. Es fallt jedoch auf, daB sich die Anisotropie gll -g, des g-Tensors von 0,046 beim Pentachlorokomplex auf 0,030 verringert, wenn der axiale Chloroligand gegen den Oxoliganden des Triphenylphosphans ausgetauscht wird.…”

Section: Das Epr-spektrum Yon Hpph:[woc14(opphs)]unclassified

Synthese, IR‐ und EPR‐Spektren sowie die Kristallstruktur von HPPh₃[WOCl₄(OPPh₃)]

Kersting

Friebel

Dehnicke

et al. 1988

Zeitschrift anorg allge chemie

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HPPh3[WOCl4(OPPh3)] entsteht in Form dunkelgrüner Kristalle bei der partiellen Hydrolyse des Diphenylacetylenkomplexes [WCl4(PhCCPh)]2 bei Anwesenheit von Triphenylphosphan und Dichlormethan als Oxidations‐ und Lösungsmittel. Versuche, die Verbindung aus WOCl3, PPh3, OPPh3 und HCl in Dichlormethan direkt herzustellen, mißlangen. HPPh3[WOCl4(OPPh3)] haben wir durch das IR‐ und das EPR‐Spektrum charakterisiert. Nach der röntgenographischen Strukturanalyse (1835 unabhängige, beobachtete, beobachtete Reflexe, R = 5,6%) kristallisiert die Verbindung monoklin in der Raumgruppe P21/n mit vier Formeleinheiten pro Elementarzelle. Sie ist aus HPPh3+‐Ionen und Anionen [WOCl4(OPPh3)]− aufgebaut, in denen das Wolframatom verzerrt oktaedrisch von vier äquatorial angeordneten Chloratomen und axial von einem terminalen O‐Atom (Bindungsabstand WO = 172 pm) und von dem O‐Atom des OPPh3‐Moleküls (WO = 206 pm) umgeben ist.

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Electron Spin Resonance Study of Some Halomolybdenyl, -tungstenyl, and -vanadyl Complexes in Solution

Cited by 100 publications

References 1 publication

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Voltammetric and Spectroscopic Studies of α- and β-[PW₁₂O₄₀]^3–Polyoxometalates in Neutral and Acidic Media: Structural Characterization as Their [(n-Bu₄N)₃][PW₁₂O₄₀] Salts

Synthese, IR‐ und EPR‐Spektren sowie die Kristallstruktur von HPPh₃[WOCl₄(OPPh₃)]

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Electron Spin Resonance Study of Some Halomolybdenyl, -tungstenyl, and -vanadyl Complexes in Solution

Cited by 100 publications

References 1 publication

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Synthesis, Characterization and Study of Thermal, Magnetic and Electrical Properties of Transition Metals Complexes of Some Newly Synthesized 2, 5-Substituted Oxadiazoles

Voltammetric and Spectroscopic Studies of α- and β-[PW12O40]3–Polyoxometalates in Neutral and Acidic Media: Structural Characterization as Their [(n-Bu4N)3][PW12O40] Salts

Synthese, IR‐ und EPR‐Spektren sowie die Kristallstruktur von HPPh3[WOCl4(OPPh3)]

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Voltammetric and Spectroscopic Studies of α- and β-[PW₁₂O₄₀]^3–Polyoxometalates in Neutral and Acidic Media: Structural Characterization as Their [(n-Bu₄N)₃][PW₁₂O₄₀] Salts

Synthese, IR‐ und EPR‐Spektren sowie die Kristallstruktur von HPPh₃[WOCl₄(OPPh₃)]