Relevant bibliographies by topics / Vanadium (IV) Complex

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Academic literature on the topic 'Vanadium (IV) Complex'

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Published: 5 June 2025
Last updated: 24 June 2025

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Journal articles on the topic "Vanadium (IV) Complex"

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S., P. ARYA, and K. SHARMA P. "Extractive Spectrophotometric Deterrnination of Vanadium as Vanadium(IV)-citrate Complex." Journal of Indian Chemical Society Vol. 69, Nov 1992 (1992): 793–95. https://doi.org/10.5281/zenodo.6044563.

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Department of Chemistry, Kurukshetra University, Kurukshetra-132 119 <em>Manuscript received 20 April 1992, revived 23 July 1992, accepted 12 August 1992</em> Extractive Spectrophotometric Deterrnination of Vanadium as Vanadium(IV)-citrate Complex.
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S., P. ARYA, and L. MALLA J. "A Spectrophotometric Method for the Deter-mination of Vanadium as Vanadium(IV)- EDTA Complex." Journal of Indian Chemical Society Vol. 68, Nov 1991 (1991): 635–36. https://doi.org/10.5281/zenodo.6158137.

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Department of Chemistry, Kurukshetra University, Kurukshetra-132 119 <em>Manuscript received 2 April 1991,&nbsp; revised 21 November 1991, accepted 27 November 1991</em> A Spectrophotometric Method for the Deter-mination of Vanadium as Vanadium(IV)- EDTA Complex
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Vergopoulos, Vassilios, Sven Jantzen, Dieter Rodewald, and Dieter Rehder. "[Vanadium(salen)benzilate]—a novel non-oxo vanadium(IV) complex." J. Chem. Soc., Chem. Commun., no. 3 (1995): 377–78. http://dx.doi.org/10.1039/c39950000377.

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Rosenthal, Esther C. E. "From vanadium(V) to vanadium(IV) - and backwards." Pure and Applied Chemistry 81, no. 7 (2009): 1197–204. http://dx.doi.org/10.1351/pac-con-08-08-32.

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With bidentate alkoxy alkoxide and alkoxy alcohol ligands, respectively, a series of oxovanadium complexes in the oxidation state +4 is synthesized starting from oxovanadium(V) compounds. The reaction of two or more equivalents of 2-methoxyethanol with VOCl3 in n-hexane yields a mixture of the monomeric oxovanadium(IV) complex cis-[VOCl2(HOCH2CH2OMe-κ2O)(HOCH2CH2OMe-κO1)] and the alkoxide-bridged oxovanadium(IV) dimer syn-[VOCl(µ-OCH2CH2OMe-κ2O)]2, which are separated by fractionated crystallization. The same reaction with 2-ethoxy- and 2-iso-propoxyethanol gives only the alkoxide-bridged oxovanadium(IV) dimers anti-[VOCl(µ-OCH2CH2OR-κ2O)]2 (R = Et, iPr). All alkoxide bridged oxovanadium(IV) dimers are furthermore obtained as decomposition products of the chloride-bridged oxovanadium(V) complexes [VO(µ-Cl)Cl(OCH2CH2OR-κ2O)]2 (R = Me, Et, iPr) by Cl2 elimination and react inversely with Cl2 to the vanadium(V) compounds.
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Yuen, Violet G., Chris Orvig, and John H. McNeill. "Glucose-lowering effects of a new organic vanadium complex, bis(maltolato)oxovanadium(IV)." Canadian Journal of Physiology and Pharmacology 71, no. 3-4 (1993): 263–69. http://dx.doi.org/10.1139/y93-041.

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Inorganic vanadium has been shown, both in vivo and in vitro, to have insulin-mimetic properties. A new organic vanadium complex, bis(maltolato)oxovanadium(IV) (BMOV), was developed to increase the absorption of vanadium from the gastrointestinal tract, thereby reducing the dose of vanadium necessary to produce glucose-lowering effects. BMOV was administered in the drinking water for 25 weeks to control and streptozotocin-induced diabetic, male Wistar rats. BMOV treatment produced a stable euglycemic state in 70% of diabetic treated animals. The other 30% of the diabetic treated animals demonstrated fluctuations in glucose control over the entire study period. The initial effective dose of BMOV was 0.45 mmol/kg, which decreased to an effective maintenance dose of 0.18 mmol/kg, significantly lower than the dose of inorganic vanadium salts used in previous studies. BMOV treatment did significantly reduce fluid consumption levels in control treated animals after 10 weeks of therapy; however, the food consumption for control treated animals was only intermittently lower than that for controls. Plasma cholesterol and triglyceride levels were normalized with BMOV treatment for all diabetic treated animals, without a concomitant increase in plasma insulin levels. An oral glucose tolerance test demonstrated that glucose homeostasis in control-treated animals occurred at significantly lower plasma insulin levels than in control animals. BMOV effectively produced the glucose-lowering effects at significantly lower dose than previously used for inorganic vanadium salts, without any overt signs of toxicity.Key words: bis(maltolato)oxovanadium(IV), streptozotocin-induced diabetes, diabetes treatment.
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Cilibrizzi, Agostino, Marina Fedorova, Juliet Collins, Robin Leatherbarrow, Rudiger Woscholski, and Ramon Vilar. "A tri-functional vanadium(iv) complex to detect cysteine oxidation." Dalton Transactions 46, no. 21 (2017): 6994–7004. http://dx.doi.org/10.1039/c7dt00076f.

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Wu, Hong-Ming, Ya-Ho Chang, Chia-Lin Su, Gene-Hsiang Lee, and Hua-Fen Hsu. "A non-oxo methanolate-bridged divanadium(IV) complex with tris(2-sulfanidylphenyl)phosphane ligands: synthesis, structural characterization and magnetic investigation." Acta Crystallographica Section C Structural Chemistry 72, no. 5 (2016): 416–20. http://dx.doi.org/10.1107/s2053229616005222.

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Vanadium chemistry is of interest due its biological relevance and medical applications. In particular, the interactions of high-valent vanadium ions with sulfur-containing biologically important molecules, such as cysteine and glutathione, might be related to the redox conversion of vanadium in ascidians, the function of amavadin (a vanadium-containing anion) and the antidiabetic behaviour of vanadium compounds. A mechanistic understanding of these aspects is important. In an effort to investigate high-valent vanadium–sulfur chemistry, we have synthesized and characterized the non-oxo divanadium(IV) complex salt tetraphenylphosphonium tri-μ-&lt;!?tlsb=-0.11pt&gt;methanolato-κ6O:O-bis({tris[2-sulfanidyl-3-(trimethylsilyl)phenyl]phosphane-κ4P,S,S′,S′′}vanadium(IV)) methanol disolvate, (C24H20P)[VIV2(μ-OCH3)3(C27H36PS3)2]·2CH3OH. Two VIVmetal centres are bridged by three methanolate ligands, giving aC2-symmetric V2(μ-OMe)3core structure. Each VIVcentre adopts a monocapped trigonal antiprismatic geometry, with the P atom situated in the capping position and the three S atoms and three O atoms forming two triangular faces of the trigonal antiprism. The magnetic data indicate a paramagnetic nature of the salt, with anS = 1 spin state.
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Chan, Lisa M., Atta M. Arif та Richard D. Ernst. "Solid State Structure of Bis[(bromo)(dicyclopentadienyl)vanadium(μ2-fluoro)][(bromo)(cyclopentadienyl)vanadium][tetrafluoroborate]". Journal of Crystallography 2015 (29 листопада 2015): 1–4. http://dx.doi.org/10.1155/2015/312963.

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The new complex [V(C5H5)2Br]2(μ2-F)2[V(C5H5)Br]+[BF4]− has been isolated from the reaction of vanadocene monobromide with the ferrocenium cation. The complex is a mixed valence compound composed of two V(IV) and one V(III) centers. The V(III) center has one cyclopentadienyl ligand in its coordination sphere, as well as a bromide and two fluoride ligands. Each fluoride ligand is also attached to one of the V(IV) centers, which additionally is coordinated by a bromide and two cyclopentadienyl ligands. The complex crystallizes in the monoclinic space group P21/m, with a=7.66490(10) Å, b=15.2457(2) Å, c=13.3185(2) Å, and β=101.2721(8)° at 150(1) K.
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Preuss, Fritz, Monika Vogel, Uwe Fischbeck, et al. "Amido-tert-butylimido-vanadium(V)-Verbindungen. Darstellung, Reaktionen und 51V-NMR-spektroskopische Untersuchungen / Amido-tert-butylimidovanadium(V) Compounds. Synthesis, Reactions and 51V NMR Spectroscopic Studies." Zeitschrift für Naturforschung B 56, no. 11 (2001): 1100–1108. http://dx.doi.org/10.1515/znb-2001-1102.

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The reactions of tBuN = VCl2 · DME with LiX (X = NHtBu, NR2, OSiPh3, SR, Alkyl, Cp) have been studied. LiNHtBu and LiCH3 furnish the binuclear diamagnetic tert-butylimido-vanadium( IV) compounds [(μ-NtBu)2V2X4]; in all other cases only the vanadium(V) compounds tBuN=VX3 and tBuN=VCpCl2 formed by disproportionation reactions of vanadium(IV) can be isolated. The syntheses of various mononuclear amido tert-butylimido-vanadium(V) complexes as well as of the binuclear complexes [μ-NtBu)2V2(NtBu)2Cl2] and [(μ-0)V2(NtBu)2Cp2Cl2] are also described. All compounds obtained have been characterized by 51V NMR spectroscopy. tBuN=V(OMe)3 was investigated by X-ray diffraction analysis; the molecular structure has been found to be that of a binuclear vanadium(V) complex with two bridging methoxo ligands.
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Lenhardt, Jeremy M., Bharat Baruah, Debbie C. Crans, and Michael D. Johnson. "Electron transfer in non-oxovanadium(IV) and (V) complexes: Kinetic studies of an amavadin model." Pure and Applied Chemistry 81, no. 7 (2009): 1241–49. http://dx.doi.org/10.1351/pac-con-08-08-23.

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Electron-transfer reactions of the eight-coordinate vanadium complex, bis-(N-hydroxyiminodiacetate)vanadium(IV) [V(HIDA)2]2–, a synthetic analog of amavadin with ascorbic acid and hexachloroiridate(IV), have been studied. The self-exchange rate constant for this analog has been calculated from oxidation and reduction cross-reactions using Marcus theory and directly measured using 51V NMR paramagnetic line-broadening techniques. The average self-exchange rate constant for the bis-HIDA vanadium(IV/V) couple equals 1.5 × 105 M–1 s–1. The observed rate enhancements are proposed to be due to the small structural differences between the oxidized and reduced forms of the HIDA complex and inner-sphere reorganizational energies. The electron-transfer reaction of this synthetic analog is experimentally indistinguishable from amavadin itself, although significant differences exist in the reduction potential of these compounds. This suggests that ligand modification effects the thermodynamic driving force and not the self-exchange process.
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Dissertations / Theses on the topic "Vanadium (IV) Complex"

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Labonnette, Daniel. "Etude des especes du vanadium iv en milieu faiblement acide et alcalin : isopolyanions mixtes mo**(vi)-v**(iv), complexes carbonates de v**(iv)." Orléans, 1987. http://www.theses.fr/1987ORLE2009.

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L'alcalinisation progressive d'une solution acide de vo**(2+) par une base forte, entraine la formation successive des especes : vooh**(+), (vooh)::(2)**(2+) vo(oh)::(2), v::(4)o::(9)h**(-), v::(4)o::(9)h**(-), v::(4)o::(9)**(2-), vo(oh)::(3)**(-) et des ions polycondenses en milieu fortement basique et tres concentre en v(iv). Quand l'alcalinisation est realisee par hco::(3)**(-) ou co::(3)**(2-), il y a formation de complexes carbonato
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Kuwata, Shigemasa. "Transition metal complexes of 3,7-diazabicyclo[3.3.1]nonane derivatives complex stabilities and oxidation reactivity of cobalt (II) and vanadium (IV) /." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974319856.

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Walmsley, Ryan Steven. "An investigation into the antidiabetic and catalytic properties of oxovanadium(IV) complexes." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1004978.

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In part 1 of this thesis, the antidiabetic activity of a series of novel oxovanadium(IV) complexes was investigated. A range of bidentate N,O-donor ligands, which partially mimic naturally occurring bioligands, were prepared and reacted with the vanadyl ion to form the corresponding bis-coordinated complexes. Initially, 2-(2ˊ-hydroxyphenyl)-1R-imidazoline (where R = H, ethyl and ethanol) ligands were prepared. The aqueous pH-metric chemical speciation was investigated using glass electrode potentiometry which allowed for the determination of protonation and stability constants of the ligands and complexes, respectively. The species distribution diagrams generated from this information gave an indication of how the complexes might behave across the broad pH range experienced in the digestive and circulatory systems. This information was used to create an improved 2nd generation of ligands that were constructed by combining the imidazole and carboxylic acid functionalities. These corresponding bis[(imidazolyl)carboxylato]-oxovanadium(IV) complexes displayed a broader pH-metric stability. Both sets of complexes improved glucose uptake and reduced coagulation in vitro. In part 2 of this thesis, a range of homogeneous and heterogeneous oxovanadium(IV) catalysts were prepared. Firstly, Merrifield beads were functionalized with ligands from Part 1 and then reacted with vanadyl sulfate to afford the corresponding heterogeneous catalysts. These displayed promising catalytic activity for the peroxide facilitated oxidation of thioanisole, styrene and ethylbenzene as well as the oxidative bromination of phenol red. Smaller imidazole-containing beads with higher surface areas than the Merrifield beads were prepared by suspension polymerization. These beads similarly demonstrated excellent catalytic activity for the oxidation of thioanisole and were highly recyclable. In attempt to increase the exposed catalytic surface area, while retaining the ease of separation achieved in the before mentioned systems, micron to nano sized electrospun fibers containing coordinating ligands were fabricated. The corresponding oxovanadium(IV) functionalized fibers were applied to the oxidation of thioanisole using a continuous flow system. The flexible and porous nature of the fiber mats was well suited to this approach. After optimization of the reactant flow rate and catalyst amount, near quantitative (> 99%) oxidation was achieved for an extended period. In addition, leaching of vanadium was mitigated by modification of the attached ligand or polymer material.
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Ugirinema, Vital. "Biospeciation and antidiabetic effects of oxidovanadium(IV) complexes." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/d1020973.

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The syntheses of bis(1R-imidazole-2/4-carboxylato)oxidovanadium(IV) complexes was successfully carried out and the complexes were isolated in the solid state. The coordinated water was confirmed by elemental analyses, and single crystal XRD. The complexes were therefore distorted octahedral rather than square planar due to the coordination of water at the sixth position. The reaction of the vanadyl ion (VO2+) with imidazole-4-carboxylic acid (Im4COOH), imidazole-2-carboxylic acid (Im2COOH) and methylimidazole-2-carboxylic acid (MeIm2COOH), respectively, in the presence of small bioligands (bL) [oxalate (Ox), lactate (Lact), and phosphate (Phos)] and high molecular weight (HMM) human serum proteins [albumin (HSA) and transferrin (hTf)] were studied in aqueous solution using potentiometric acid base titrations under oxygen and carbon dioxide–free conditions. The data obtained from these titrations was used to calculate the binary and ternary stability constants using the programme HYPERQUAD. The overall stability constants for VO2+-L-Ox system (log β1111 = 18.9, 18.79 and 19.86), VO2+-L-Lact system (log β1111 = 21.83, 20.98 and 22.86), and VO2+-L-Phos system (log β1111 = 27.35, 24.16 and 27.42) (for L= Im4COOH, Im2COOH and MeIm2COOH, respectively) were obtained. The species distribution diagrams showed that under physiological pH the following ternary and quaternary species; [(VO)L(bL)], and [VO(L)(bL)(OH)], would dominate provided that the competition with serum proteins is not too strong. These species were also confirmed by HPLC, LC-MS and EPR. The overall stability constants for the VO2+-L-HSA system (log β2,1,1,0 = 24.3, 23.7 and 24.7), and for the VO2+-L-hTf system (log β2,2,1,0 = 31.1, 30.8, 36.4 for L = Im4COOH, Im2COOH and MeIm2COOH, respectively), suggesting stronger binding of transferrin. The formation constants for the formation of binary (VO(IV) and the proteins) were 9.1 and 13 for log β11, and 20.9 and 25.2 for β12, for human serum albumin and human serum transferrin respectively. The species distribution diagrams for the proteins (HMM) with oxidovanadium(IV) under physiological pH was dominated by VO(HMM)2, VOL(HMM) for unsubstituted Im4COOH and Im2COOH, however, for the N-substituted MeIm2COOH, the species distribution diagrams under physiological pH, were dominated by VOL2, VO(HMM)2 and VO2L2(HMM). These species were further confirmed by HPLC, MALDI-TOF-MS and EPR. The glucose stimulated insulin secretion (GSIS) action of the complexes was investigated using INS-1E cells at 1μM concentration which was established through cytotoxicity studies via the MTT assay. The vanadium salt (VOSO4), cationic vanadium(IV) complex ([VO(MeImCH2OH)2]2+) were also included in the GSIS study in addition to the three neutral complexes [VO(Im4COO)2, VO(Im2COO)2 and VO(MeIm2COO)2] for comparison. The neutral complexes, especially VO(MeIm2COO)2, showed promising results in the stimulation of insulin secretion than the cationic complex and the vanadium salt.
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Alvino, De la Sota Nora, and Calderón Javier Pacheco. "Diseño de Agentes Antidiabéticos de Vanadio: Desarrollo y Avances Recientes." Revista de Química, 2007. http://repositorio.pucp.edu.pe/index/handle/123456789/100688.

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El descubrimient o del mayor efecto hipoglicémic o del bis(maltolato)oxovanadio (IV) (BMOV) con respecto a las salesde vanadio, propició el diseño, síntesis y evaluación in vitro e in vivo de una amplia variedad de complejos de oxovanadio(IV) con diversos ligandos orgánicos para su potencial uso como fármacos antidiabéticos que reemplacen , parcial ototalmente , las incómodas inyecciones de insulina en el tratamiento de la diabetes mellitus tipo 1 o los fármacos oraleshipoglicemiante s empleados generalment e en terapias combinadas para la tipo 2.Recientemente , un complejo etil sustituido , análogo al BMOV, ha completado favorablemente la fase clínica I deensayos en humanos. El diseño de nuevos tipos de complejos y el desarrollo de nuevos modos de administración constituyenactualmente un activo campo de investigación<br>Design of Vanadium Antidiabetic Agents: Development and Recent AdvancesThe discovery of the enhanced hypoglycemic activity of bis(maltolate)oxovanadiu m (IV) (BMOV) compared to simplevanadium salts stimulated the design, synthesis and both in vitro and in vivo evaluation of a large variety of oxovanadium (IV)complexes with different organic ligands for their potential use as antidiabetic drugs that may be able to substitute, either partially or totally, the daily insulin injections used in the treatment of type 1 diabetes mellitus or the orally available hypoglycemic drugs usually used in combined therapy for type 2 diabetes.Recently, a close BMOV analogue, an ethyl substitute, has already successfully completed the phase 1 clinical trial in humans. The design of new types of complexes and the development of alternative delivery methods represent an active research field today.
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Weiss, Vitor Correa. "Complexos de vanádio(IV) não oxo." reponame:Repositório Institucional da UFSC, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/93103.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Química, Florianópolis, 2009.<br>Made available in DSpace on 2012-10-24T16:40:44Z (GMT). No. of bitstreams: 1 273349.pdf: 901411 bytes, checksum: b664df92fc9cf4e20e2e9976ba78a192 (MD5)<br>A existência de diferentes estados de oxidação é uma característica importante na química dos metais de transição. O potencial de oxirredução de um complexo metálico não depende somente da natureza do íon metálico. A presença de um ligante complexado ao metal altera a densidade eletrônica sobre os centros metálicos e a estabilidade dos mesmos, afetando os potenciais de oxirredução dos íons metálicos. Neste sentido, apresenta-se neste trabalho a síntese e caracterização de quatro novos ligantes H4btben-Br, H4btben-NO2, H4btben e H4btben-CH3, que diferem exclusivamente na presença dos grupos substituintes Br, NO2, H e CH3 nas posições para aos grupos fenolatos, e seus respectivos complexos de vanádio(IV) não-oxo, com o objetivo de estudar a variação no potencial redox do metal devido a presença desses substituintes. Os complexos foram caracterizados pelas técnicas de espectroscopia no infravermelho, UV-Vis e Ressonância Paramagnética Eletrônica (EPR). Os complexos [V(btben-NO2] e [V(btben)] também foram caracterizados através de suas estruturas cristalinas por difração de raios X. Para estudar a influência no potencial redox do íon metálico pelos quatro grupos substituintes Br, NO2, H e CH3, foram realizados estudos eletroquímicos dos complexos através do método de voltametria cíclica a diferentes velocidades de varredura e seus potenciais correlacionados com os parâmetros de Hammett dos respectivos substituintes, onde se observou uma correlação linear, demonstrando uma influência direta dos grupos nos potenciais redox desses complexos.
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Olivier, Isabelle. "Stabilité et structure des complexes du cuivre (II) et du vanadium (IV) avec des sucres." Lille 1, 1990. http://www.theses.fr/1990LIL10009.

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Ce travail aborde l'étude de la coordination de sucres amines, d'acides uroniques et de l'acide salicylique avec les ions CU (II) et VO (IV). Il constitue une approche des mécanismes chimiques de l'assimilation par les plantes des éléments nutritifs contenus dans les sols. La spectroscopie électronique, le dichroisme circulaire et la résonance paramagnétique électronique interviennent pour caractériser l'environnement chimique de l'ion complexe, la potentiométrie, outil principal de l'investigation, permet de déterminer la stabilité des complexes formes. Seul CU (II) se complexe avec les sucres aminés, le groupement aminé apparaissant comme premier site de complexation. Les groupements hydroxyles deprotonés en position c(1) et c(3) interviennent directement dans la formation des complexes ML2 H2 et sous forme protonés ont un rôle stabilisateur dans celle de ML2. Des différences de stabilité sont relevées avec les acides uroniques, en relation avec la nature de l'ion, cuivre(II) ou oxovanadium(IV). A ph<5, dans tous les cas on observe la formation des uronates. Au-dela de ce ph les espèces m(ac gal)2 h2 et M(AC GAL)2H1 apparaissent pour les systèmes ou intervient l'acide d-galactoronique. Par contre avec l'acide d glucuronique, l'hydroxyde en c(4) n'intervient pas dans la coordination, ce qui entraîne la formation d'espèces polymérisées. Avec l'acide salicyclique, le processus de complexation proposé met en évidence une double compétition entre ligands différents (sal et oh-) et les espèces à 1 ou 2 molécules d'acide salicylique
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Thompson, Nicholas John. "Chromium (III), Titanium (III), and Vanadium (IV) sensitization of rare earth complexes for luminescent solar concentrator applications." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69674.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 56-59).<br>High optical concentrations without excess heating in a stationary system can be achieved with a luminescent solar concentrator (LSC). Neodymium (Nd) and ytterbium (Yb) are excellent infrared LSC materials: inexpensive, abundant, efficient, and spectrally well-matched to high-performance silicon solar cells. These rare earth ions are reasonably transparent to their own radiation and capable of generating high optical concentrations. Neodymium's and ytterbium's disadvantage is their relatively poor absorption overlap with the visible spectrum. Transition metals such as chromium (Cr), titanium (Ti), and vanadium (V) have broadband absorption covering the visible and near-infrared and can efficiently sensitize neodymium and ytterbium through a non-radiative energy transfer process. Chromium, titanium, and vanadium containing glasses were fabricated using a custom designed glass making furnace. The optical properties including molar absorption coefficient, photoluminescence spectrum, and energy transfer characteristics were investigated to determine the suitability for LSC applications. Glasses containing Cr or V co-doped with Nd or Yb demonstrated energy transfer from the transition metal to the rare earth, a fundamental step toward integration into a LSC. Titanium co-doped glasses did not exhibit photoluminescence or energy transfer. Chromium co-doped glasses exhibit both forward and backward energy transfer. Vanadium holds the best promise as a sensitizer for LSC applications.<br>by Nicholas John Thompson.<br>S.M.
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Labonnette, Daniel. "Etude des espèces du vanadium IV en milieu faiblement acide et alcalin isopolyanions mixtes MoVI-VIV, complexes carbonatés de VIV /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606781k.

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Jäger, Norbert. "Molekülmechanische und quantenchemische Berechnung der räumlichen und elektronischen Struktur von Vanadium(IV)- und Oxo-Rhenium(V)-Chelaten dreizähnig diacider Liganden." Phd thesis, Universität Potsdam, 1998. http://opus.kobv.de/ubp/volltexte/2005/154/.

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In dieser Arbeit wurden die Molekülstrukturen und die elektronischen Eigenschaften von Vanadium(IV)- und Oxo-Rhenium(V)-Chelaten mit einem kombinierten molekülmechanisch-quantenchemischen Ansatz untersucht, um sterische und elektronische Effekte der Komplexierung mit einem theoretischen Modell zu quantifizieren. Es konnte gezeigt werden, daß auf diese Weise detaillierte Aussagen zu den Bindungsverhältnissen der Metallchelate getroffen werden können. Die Berechnung der Molekülstrukturen gelingt mit exzellenter Übereinstimmung mit den Kristallstrukturen der Komplexe. Die molekülmechanischen Berechnungen erfolgen auf der Grundlage des Extensible Systematic Force Field ESFF und des Consistent Force Field 91 (CFF91). Dabei konnte die hohe Flexibilität und Zuverlässigkeit des regelbasierten ESFF für eine Vielzahl verschiedenster Metallchelate nachgewiesen werden. Aufgrund der mangelhaften Ergebnisse für trigonal-prismatische Komplexgeometrien mit dem ESFF wurden eine Anpassung des CFF91 für derartige Vanadiumkomplexe vorgenommen. Auf Grundlage von theoretischen Ergebnissen wurden die alternativen Strukturen von isoelektronischen Vanadiumkomplexen berechnet und in Übereinstimmung mit experimentellen Daten, theoretischen Modellen der Komplexchemie und empirischen Fakten eine Hypothese für die Ursache der strukturellen Differenzen erarbeitet.<br> Der hier vorgestellte, kombinierte Algorithmus aus kraftfeldbasierter Geometrieoptimierung und single-point-Rechnung an diesen Strukturen ist ein zuverlässiger und relativ schneller Weg Molekülgeometrien von Metallkomplexen zu berechnen. Er kann somit zur Voraussagen von Komplexstrukturen und zur gezielten Modellierung definierter Koordinationsgeometrien verwendet werden.<br>In this work the molecular structures and the electronic properties of Vanadium(IV)- and Oxo-Rhenium(V)-chelates have been investigated to quantify steric and electronic effects of complexation. It has been shown, that in this way detailed insight can be gained into the bonding conditions of that metal complexes. Molecular mechanic calculations based on the Extensible Systematic Force Field (ESFF) and the Consistent Force Field 91 (CFF91) have been carried out. High flexibility and reliability of the rule based ESFF has been proven for a large variety of different metal chelates. Due to the poor ESFF-results for trigonal-prismatic complex geometries, a fit of the CFF91 for that species was done. Based on the theoretical results the alternative structure of isoelectronical vanadium(IV)- complexes have been calculated and a hypothesis on the reason for the structural differnces have been stated in accordance with experimental results, theoretical models of complex chemistry, and empirical facts. This combined approach of force field based geometry optimization and single point calculation at these structures has been proven to be a reliable and fast way to get molecular structures of metal complexes. It can be used to predict complex structures for modelling destinct coordination geometries.
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Book chapters on the topic "Vanadium (IV) Complex"

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) diisopropylamide complex." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_51.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) dicyclohexylamide complex." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_52.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of arylimido vanadium(IV) complex." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_56.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cationic vanadium(IV) complex." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_52.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) complex with dithiofuroate." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_63.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of a cationic vanadium(IV) complex." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_53.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) complex with kojic acid." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_377.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) complex with 2,3-dihydroxypyridine." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 7. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65895-6_7.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) dichloride complex with trimethylsilyl amide." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_64.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of vanadium(IV) chloride complex with trimethylsilyl amide." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_65.

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Conference papers on the topic "Vanadium (IV) Complex"

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Akbar, Himyan, Salma Habib, Mohammed Mahroof Tahir, and Lakshmaiah Sreerama. "Synthesis and Characterization of Vanadium (IV)-Flavonoid Complexes and its Antioxidant ability toward Superoxide and Radical Scavenging." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0109.

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In this project Vanadium complex -Vanadium (IV) - flavone was synthesized using vanadium (IV) acetylacetonate (VO(acac)2) complex and 3-hydroxy-6-methyl flavone ligand. The complex stability was checked using FTIR and UV-vis spectroscopies. Peackes around 990 cm-1 conforms the formation of (V=O) in the complex, as well as (V-O) around 790 cm-1. In UV-Vis spectrum peak around 400-450 nm was noticed, which conforms the formation of the vanadium complex that correspond to the ligand to metal charge transfer (LMCT) transition. The radical scavenging abilities of vanadium complex were investigated using DPPH. The anti-oxidant activity using (BHA) as a standard reference, the complex synthesized displayed strong DPPH antioxidant radical scavenging activity compared to VO(acac)2 and BHA, with IC50 value of (105, 95 and 96) mM respectively. The absorbance in which the reducing power occurred were found to be (0.397, 0.825 and 0.228) for the complex, VO(acac)2 and BHA.
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