Category: 52093-25-1

Application of 52093-25-1, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a article，once mentioned of 52093-25-1

Acyl phosphate monoesters are intermediates in many biochemical acylation reactions, such as those involving aminoacyl adenylates. Benzoyl methyl phosphate, a typical acyl phosphate monoester, is slowly hydrolyzed in neutral solutions but reacts rapidly with amines. Since biochemical processes of acyl phosphate monoesters involve accelerated reactions with oxygen-centered nucleophiles, we sought catalysts for hydrolysis and methanolysis of benzoyl methyl phosphate to mimic the biochemical outcome. Lanthanide ions are particularly effective catalysts, accelerating reactions much more than comparable levels of magnesium ion. Detailed kinetic analysis of the hydrolysis reactions reveals formation of a 1:1 complex, followed by rapid reaction with a nucleophile. The hydroxide-dependent hydrolysis rate in the europium complex is about 105 times that of free substrate with hydroxide. A mechanism that accounts for the data and observed behavior involves bidentate coordination of the metal ion by the acyl phosphate through phosphate and carbonyl oxygens, lowering the energy of the tetrahedral addition intermediate and the associated transition states. The dependence of the metal ion catalyzed process on the concentration of hydroxide ion is consistent with coordinated hydroxide acting as a nucleophile. The reaction of benzoyl methyl phosphate with methanol to form methyl benzoate and methyl phosphate is 30 000 times more rapid in the presence of 0.0001 M lanthanum triflate (in the absence of the metal ion kobs = 2.1 × 10-7 s-1, at 25C). Thus, the combination of acyl phosphate esters and lanthanide salts appears to be a promising method for biomimetic acylation of hydroxyl groups.

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

Synthetic Route of 52093-25-1, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article，once mentioned of 52093-25-1

Luminescent lanthanide (III) ions have been exploited for circularly polarized luminescence (CPL) for decades. However, very few of these studies have involved chiral samarium (III) complexes. Complexes are prepared by mixing axial chiral ligands (R/S))-2,2?-bis(diphenylphosphoryl)-1,1?-binaphthyl (BINAPO) with europium and samarium Tris (trifluoromethane sulfonate) (Eu (OTf)3 and Sm (OTf)3). Luminescence-based titration shows that the complex formed is Ln((R/S)-BINAPO)2(OTf)3, where Ln = Eu or Sm. The CPL spectra are reported for Eu((R/S)-BINAPO)2(OTf)3 and Sm((R/S)-BINAPO)2(OTf)3. The sign of the dissymmetry factors, gem, was dependent upon the chirality of the BINAPO ligand, and the magnitudes were relatively large. Of all of the complexes in this study, Sm((S)-BINAPO)2(OTf)3 has the largest gem = 0.272, which is one of the largest recorded for a chiral Sm3+ complex. A theoretical three-dimensional structural model of the complex that is consistent with the experimental observations is developed and refined. This report also shows that (R/S)-BINAPO are the only reported ligands where gem (Sm3+) > gem (Eu3+).

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

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 52093-25-1, name is Europium(III) trifluoromethanesulfonate, introducing its new discovery. name: Europium(III) trifluoromethanesulfonate

Heterobimetallic Lewis acids M3(THF)n(BINOLate) 3Ln [M = Li, Na, K; Ln = lanthanide(III)] are exceptionally useful asymmetric catalysts that exhibit high levels of enantioselectivity across a wide range of reactions. Despite their prominence, important questions remain regarding the nature of the catalyst-substrate interactions and, therefore, the mechanism of catalyst operation. Reported herein are the isolation and structural characterization of 7- and 8-coordinate heterobimetallic complexes Li3(THF)4(BINOLate)3Ln(THF) [Ln = La, Pr, and Eu], Li3(py)5(BINOLate)3Ln(py) [Ln = Eu and Yb], and Li3(py)5(BINOLate)3La(py)2 [py = pyridine]. Solution binding studies of cyclohexenone, DMF, and pyridine with Li3(THF)n(BINOLate)3Ln [Ln = Eu, Pr, and Yb] and Li3(DMEDA)3(BINOLate)3Ln [Ln = La and Eu; DMEDA = N,N?-dimethylethylene diamine] demonstrate binding of these Lewis basic substrate analogues to the lanthanide center. The paramagnetic europium, ytterbium, and praseodymium complexes Li3(THF) n(BINOLate)3Ln induce relatively large lanthanide-induced shifts on substrate analogues that ranged from 0.5 to 4.3 ppm in the 1H NMR spectrum. X-ray structure analysis and NMR studies of Li 3(DMEDA)3(BINOLate)3Ln [Ln = Lu, Eu, La, and the transition metal analogue Y] reveal selective binding of DMEDA to the lithium centers. Upon coordination of DMEDA, six new stereogenic nitrogen centers are formed with perfect diastereoselectivity in the solid state, and only a single diastereomer is observed in solution. The lithium-bound DMEDA ligands are not displaced by cyclohexenone, DMF, or THF on the NMR time scale. Use of the DMEDA adduct Li3(DMEDA)3(BINOLate) 3La in three catalytic asymmetric reactions led to enantioselectivities similar to those obtained with Shibasaki’s Li 3(THF)n(BINOLate)3La complex. Also reported is a unique dimeric [Li6(en)7(BINOLate)6Eu 2][mu-eta1,eta1-en] structure [en = ethylenediamine]. On the basis of these studies, it is hypothesized that the lanthanide in Shibasaki’s Li3(THF)n(BINOLate) 3Ln complexes cannot bind bidentate substrates in a chelating fashion. A hypothesis is also presented to explain why the lanthanide catalyst, Li3(THF)n(BINOLate)3La, is often the most enantioselective of the Li3(THF)n(BINOLate)3Ln derivatives.

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 52093-25-1 is helpful to your research. Quality Control of: Europium(III) trifluoromethanesulfonate

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

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 52093-25-1, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article, authors is Pope, Simon J.A.，once mentioned of 52093-25-1

A series of homo-binuclear lanthanide complexes have been prepared from DO3A derived systems containing seven-coordinate binding domains linked via an aromatic. The luminescence properties of xylyl bridged complexes show that the lanthanide ions behave as isolated centres, while the combination of the lanthanide contraction and the lipophilicity of the linker group limits inner-sphere hydration around the metal centres for later lanthanides such as ytterbium.

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

Synthetic Route of 52093-25-1, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article，once mentioned of 52093-25-1

We report the synthesis, characterization, solid-state structure and solution behavior of simple lanthanide trifluoromethanesulfonate complexes supported by a hexadentate tetrakis(2-pyridylmethyl)ethylenediamine ligand. The complexes’ solid-state structures exhibit different trifluoromethanesulfonate coordination, correlating with the size difference of the lanthanide ions. The ligand is capable of sensitizing Nd, Sm, Eu, Tb, Dy, and Yb yielding metal-centered emission with moderate quantum yields.

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

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Application In Synthesis of Europium(III) trifluoromethanesulfonate, Which mentioned a new discovery about 52093-25-1

The syntheses of the two tetraazamacrocyclic ligands L1 and L2 bearing a [(methoxy-2-nitrophenyl)amino]carbonyl chromophore, i.e., an N-(methoxy-2-nitrophenyl)acetamide moiety, together with their corresponding lanthanide-ion complexes are described. A combined spectroscopic (UV/VIS, 1H-NMR), structural (X-ray), and theoretical (DFT) investigation revealed that the absorption properties of the chromophores were dictated by the extent of electronic delocalisation, which in turn was determined by the position of the MeO substituent at the aromatic ring. X-Ray crystallographic studies showed that when attached to the macrocycle, both isomeric forms of the N-(methoxy-2-nitrophenyl)acetamide unit can participate in coordination, via the C=O, to an encapsulated potassium cation. Luminescence measurements confirmed that such a binding mode also exists in solution for the corresponding lanthanide complexes (q ca. ?1), with the para-MeO derivative allowing longer wavelength sensitization (lambdaex 330 nm).

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

Synthetic Route of 52093-25-1, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article，once mentioned of 52093-25-1

We demonstrate through structural, spectroscopic, and magnetic studies that the main factors governing the nuclearity of M-Gd (M = Cu, Ni) complexes derived from compartmental Schiff base ligands are the different affinities of the lanthanide ions for the potential ligands and anions present in the reaction medium. In the eight examples studied, there is competition between the tetradentate O2O2 coordination site of the polydentate ligand and the anionic entities brought by the gadolinium salts. The strong affinity of nitrato anions for lanthanides yields dinuclear complexes and prevents formation of trinuclear entities, whereas the use of poorly coordinating anions such as triflates may yield either dinuclear or trinuclear complexes, depending on the 3d/4f ratio. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.

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

Electric Literature of 52093-25-1, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article，once mentioned of 52093-25-1

A water-soluble, enantiopure lanthanide complex, SSS-[Ln·L 3], has been assessed as an effective chiral derivatising agent for the determination of the enantiomeric purity of alpha-hydroxy acids in aqueous solution. The complex displays superior chemical shift non-equivalence (DeltaDeltadelta ?2-11 ppm) for the diastereomeric resonances of interest compared to lanthanide shift reagents reported in the literature (DeltaDeltadelta <0.1 ppm, typically). 1H NMR studies have also revealed that SSS-[Ln·L3] can be used to determine the absolute configuration of alpha-amino acids at physiological pH, in water. The ability of SSS-[Ln·L3] to signal anion binding and, in particular, to distinguish between diastereomers through optical techniques such as lanthanide luminescence and circular dichroism has also been assessed. The Royal Society of Chemistry 2006. Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Electric Literature of 52093-25-1, you can also check out more blogs about52093-25-1

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

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 52093-25-1, molcular formula is C3EuF9O9S3, introducing its new discovery. Application In Synthesis of Europium(III) trifluoromethanesulfonate

A series of strongly luminescent 5d/4f heterometal-organic macrocycles formulated as Ln2(Pt-L)2 have been constructed from a preformed cis-blocked alkynylplatinum metalloligand (Pt-L) and lanthanide (Ln = LaIII, EuIII, LuIII) ions. Open metal sites on the lanthanide centres of the heterometal-organic macrocycles facilitate not only the post-assembly modification leading to great enhancement of the luminescence, but also the displacement sensing toward toxic thiophosphonates.

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

Reference of 52093-25-1, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Article，once mentioned of 52093-25-1

Cyanide ions are shown to interact with lanthanide complexes of phenacylDO3A derivatives in aqueous solution, giving rise to changes in the luminescence and NMR spectra. These changes are the consequence of cyanohydrin formation, which is favored by the coordination of the phenacyl carbonyl group to the lanthanide center. These complexes display minimal affinity for fluoride and can detect cyanide at concentrations less than 1 mum. By contrast, lanthanide complexes with DOTAM derivatives display no affinity for cyanide in water, but respond to changes in fluoride concentration.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Reference of 52093-25-1, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 52093-25-1, in my other articles.

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