Category: 3153-26-2

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Divanadium(V) complexes with 4-R-benzoic acid (1-methyl-3-oxo-butylidene)-hydrazides: Syntheses, structures and properties

In acetonitrile, reactions of bis(acetylacetonato)oxidovanadium(IV) ([VO(acac)2]) with 4-R-benzoylhydrazine in 1:1 mole ratio provide coordinatively symmetrical complexes (1-5) of the {OV(mu-O)VO}4+ motif in 40-47% yields. On the other hand, in methanol the same reactants provide complexes (6-10) containing the {OV(mu-OMe)2VO}4+ core in 37-50% yields. In both series of complexes, the ligand is the O,N,O-donor deprotonated Schiff base system 4-R-benzoic acid (1-methyl-3-oxo-butylidene)-hydrazide formed by template condensation of acac- with 4-R-benzoylhydrazine (R = H, Cl, OMe, NO2 and NMe2). All the complexes have been characterized by elemental analysis, magnetic and spectroscopic (IR, UV-Vis and NMR) measurements. Molecular structures of three representative complexes (4, 6 and 7) have been determined by X-ray crystallography. In each complex, the dianionic planar ligand is coordinated to the metal centre via the enolate-O, the imine-N and the O-atom of the deprotonated amide functionality. Cyclic voltammetric measurements in dichloromethane revealed that complexes 1-5 are redox inactive, while complexes 6-10 display a metal centred reduction in the potential range -0.06 to 0.0.32 V (versus Ag/AgCl).

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 3153-26-2, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V. In a Article£¬once mentioned of 3153-26-2

Oxidovanadium catechol complexes: Radical versus non-radical states and redox series

A new family of oxidovanadium complexes, [(L1 R)(VO)(LR?)] (R = H, R? = H, 1; R = H, R? = -CMe3, 2; R = H, R? = Me, 3; R = -CMe3, R? = H, 4 and R = -CMe3, R? = -CMe3, 5), incorporating tridentate L1RH ligands (L1 RH = 2,4-di-R-6-{(2-(pyridin-2-yl)hydrazono)methyl}phenol) and substituted catechols (LR?H2) was substantiated. The V-Ophenolato (cis to V=O), V-OCAT (cis to V=O) and V-OCAT (trans to V=O) lengths span the ranges, 1.894(2)-1.910(2), 1.868(2)-1.887(2), and 2.120(2)-2.180(2) A. The metrical oxidation states (MOS) of the catechols in 1-5 are fractional and vary from -1.43 to -1.60. The 51V isotropic chemical shifts of solids and solutions of 1-5 are deshielded (51V CP MAS: -19.8 to +248.6; DMSO-d6: +173.9 to +414.55 ppm). The closed shell singlet (CSS) solutions of 1-5 are unstable due to open shell singlet (OSS) perturbations. The ground electronic states of 1-5 are defined by the resonance contribution of the catecholates (L R?CAT2-) and LR? SQ-? coordinated to the [VO]3+ and [VO]2+ ions. 1-5 are reversibly reducible by one electron at -(0.58-0.87) V, referenced vs ferrocenium/ferrocene, to VO2+ complexes, [(L1R-)(VO2+)(L R?CAT2-)]- [1-5]-. 1-5 display another quasi-reversible or irreversible reduction wave at -(0.80-1.32) V due to the formation of hydrazone anion radical (L 1R2-?) complexes, [(L1 R2-?)(VO2+)(LR?CAT 2-)]2-, [1-5]2-, with S = 1 authenticated by the unrestricted density functional theory (DFT) calculations on 12- and 32- ions. Frozen glasses electron paramagnetic resonance (EPR) spectra of [1-5]- ions [e.g., for 2, g|| = 1.948, g = 1.979, A|| = 164, A = 60] affirmed that [1-5]- ions are the [VO]2+ complexes of LR?CAT 2-. Spectro-electrochemical measurements and time-dependent DFT (TD DFT) calculations on 1, 3, 1-, 3-, and 12- disclosed that the near infrared (NIR) absorption bands of 1-5 at 800 nm are due to the CSS-OSS metal to ligand charge transfer which are red-shifted in the solid state and disappear in [1-5]- and [1-5]2- ions.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Reference of 3153-26-2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 3153-26-2, in my other articles.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, 3153-26-2, such as the rate of change in the concentration of reactants or products with time.In a article, authors is Muylaert, Ilke, mentioned the application of 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V

Ultra stable ordered mesoporous phenol/formaldehyde polymers as a heterogeneous support for vanadium oxide

Ordered mesoporous phenol/formaldehyde polymers are presented as an ultra stable heterogeneous support for vanadium oxide. The Royal Society of Chemistry.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. 3153-26-2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 3153-26-2, in my other articles.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V, 3153-26-2, In a Article, authors is Sutradhar, Manas£¬once mentioned of 3153-26-2

Water soluble heterometallic potassium-dioxidovanadium(V) complexes as potential antiproliferative agents

Two water soluble heterometallic potassium-dioxidovanadium polymers, [KVO2(L1)]n (1) and [KVO2(L2)(H2O)]n (2) [H2L1 = (2,3-dihydroxybenzylidene)-2-hydroxybenzohydrazide and H2L2=(2,3-dihydroxybenzylidene) benzohydrazide], have been synthesized and characterized by IR, NMR, elemental analysis and single crystal X-ray diffraction. The antiproliferative potentials of 1 and 2 were examined towards human colorectal carcinoma (HCT116), and lung (A549) and breast (MCF7) adenocarcinoma cell lines. 1 exhibits a high cytotoxic activity against colorectal carcinoma cells (HCT116), with IC50 lower than those for cisplatin.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V, “3153-26-2. In a Article, authors is Paul, Yash£¬once mentioned of 3153-26-2

Oxovanadium-Phosphazene Complexes: Synthesis and Characterization

Cyclic vanadium-phosphazene complexes in 5- and 6-coordination have been synthesized by the reaction of bis(acetylacetonato)oxovanadium(IV), [VO(acac)2], or trichlorooxovanadium(V), [VOCl3], with acyclic phosphazene ligands, [HN(PPh2NR)2], (where R = Ph or SiMe3) in 1:1 and 1:2 molar ratio. These green colored complexes correspond to the general formulae [VO(acac)L], [VOCl2L] and [VOClL2] (where L = [HN(PPh2NR)2]. They are fairly soluble in most organic solvents and sensitive to moisture. These complexes are characterized by various physico-chemical technique, viz elemental analyses (C, H, N, V and Cl), molecular weight determinations and spectral studies including IR and NMR (1H, 13C and 31P), which indicated the monomeric nature of the complexes having a bidentate mode of bonding with the phosphazene ligand endowing a square-pyramidal or octahedral geometry around the vanadium atom, respectively.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

3153-26-2, One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time.In a article, authors is Maity, Dipankar, mentioned the application of 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V

Oxovanadium(V) complexes of bis(phenolate) ligands with acetylacetone as co-ligand: Synthesis, crystal structure, electrochemical and kinetics studies on the oxidation of ascorbic acid

Two vanadium(V) complexes, [VO(L1)](acac)] (1) and [VO(L2)(acac)] (2), where H2L1 = N,N-bis(2-hydroxy-3-5-di-tert-butylbenzyl)propylamine and H2L2 = 2,2?-selenobis(4,6-di-tert-butylphenol), have been synthesized and characterized by elemental analyses, IR, 51V NMR, both in the solid and in solution, and cyclic voltammetric studies. Single crystal X-ray studies reveal that in complex 1 the vanadium atom is octahedrally coordinated with an O5N donor environment, where the oxygen atom of the VV{double bond, long}O moiety and the N atom of the ONO ligand occupy the axial sites while two oxygen atoms (O1 and O2) from the bisphenolate ligand and two oxygen atoms (O3 and O4) from the acac ligand occupy the equatorial plane. A similar bonding pattern has also been encountered for 2 with the exception that a Se atom instead of N is involved in weak bonding to the metal center. Both complexes showed reversible cyclic voltammeric responses and E1/2 appears at -0.18 and 0.10 V versus NHE for complexes 1 and 2, respectively. The kinetics of oxidation of ascorbic acid by complex 1 were carried out in 50% MeCN-50% H2O (v/v) at 25 C. The high formation constant value, Q = 63 ¡À 7 M-1, reveals that the reaction proceeds through the rapid formation of a H-bonded intermediate. The low k2Q2/k1Q1 ratio (13.4) for 1 points out that there is extensive H-bonding between the oxygen atom of the VV{double bond, long}O group and the OH group of ascorbic acid.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. 3153-26-2. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 3153-26-2, name is Vanadyl acetylacetonate. In an article£¬Which mentioned a new discovery about 3153-26-2

Synthesis and Crystal Structures of Oxidovanadium(V) Complexes Derived from Hydrazones with the Catalytic Property

Two new structurally similar oxidovanadium(V) complexes [VOL1L] (1) and [VOL2L] (2) (L = acetohydroxamate) derived from N?-(5-bromo-2-hydroxybenzylidene)-2-methylbenzohydrazide (H2L1) and N?-(2-hydroxy-4-methoxybenzylidene)-3-methylbenzohydrazide (H2L2) hydrazones are prepared and characterized by elemental analyses, FT-IR, 1H NMR, and single crystal X-ray diffraction (CIF files CCDC Nos. 1859442 (1) and 1859446 (2)). The V atoms in the complexes are in the octahedral coordination, with hydrazones behaving as binegative donors and acetohydroxamate acting as a mononegative ligand. The complexes function as effective olefin epoxidation catalysts.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 3153-26-2 is helpful to your research. 3153-26-2

Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 3153-26-2, Name is Vanadyl acetylacetonate, molecular formula is C10H14O5V, “3153-26-2. In a Article, authors is Pocutsa£¬once mentioned of 3153-26-2

Glyoxal-promoted homogeneous catalytic oxygenation of cyclohexane with hydrogen peroxide in the presence of V and Co compounds

The efficiency of cyclohexane oxidation with hydrogen peroxide catalyzed by vanadyl acetylacetonate at 40C and atmospheric pressure is enhanced by glyoxal additive. The process selectively produces a mixture of cyclohexyl hydroperoxide, cyclohexanol, and cyclohexanone with a high rate (up to 4400 catalyst turnover number). Cobalt(II) acetylacetonate is much less active but more selective with respect to cyclohexyl hydroperoxide.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI