Category: 33100-27-5

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Enhancement of Cation Binding in Lariat Ethers Bearing a Methyl Group at the Quaternary, Pivot Carbon Atom

A number of carbon-pivot lariat ethers have been prepared and compared, with their counterparts having a methyl group bonded to the side-arm-bearing or pivot carbon.All of the compounds examined are 15-crown-5 derivatives, and in this series, the methyl lariats invariably show a higher affinity for sodium than do the nonmethylated species.The results are less consistent in the case of potassium cation which is larger than the 15-crown-5 compound’s cation binding hole.The enhanced stability constant observed for sodium with the methyl lariats is attributed to reduced s ide-arm mobility or conformational changes in either the side arm or macroring.

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Syntheses and Crystal Structure of the Crown Ether Complexes (18-Crown-6)*2CH3CN, *CH3CN, and PF6

Single crystals of (18-crown-6)*2CH3CN were obtained by cooling a solution of 18-crown-6 in acetonitrile to 4 deg C.Space group P21/n, Z = 2.629 observed independent reflexions, R = 0.062.Lattice dimension at 19 deg C: a = 911.7(1), b = 852.0(1), c = 1370.0(2) pm; beta = 104.61(1) deg.The compound forms a molecular structure with approximate D3d symmetry of the crown ether molecule, and C-H…O interactions of the acetonitrile molecules with the crown ether, the H…O distances being 243, 253, and 267 pm respectively. *CH3CN is formed as a by-product of the reaction of ReNCl4 with sodium fluoride in acetonitrile in the presence of 15-crown-5 and traces of water.Space group P<*>, Z = 2, 3107 observed independent reflexions, R = 0.045.Lattice dimensions at 19 deg C: a = 823.4(1), b = 107.8(1), c = 1204.0(1) pm; alpha = 112.40(1) deg, beta = 94.35(1) deg, gamma = 104.63(1) deg.The compound forms ion pairs, in which the sodium atom is sixfold coordinated by the five oxygen atoms of the crown ether molecule, as well as by one oxygen atom of the ReO4(-) ion, which is only slightly distorted.The bond length Na-OReO3 is 237.8(8) pm, the bond angle NaORe is 164.3(5) deg. PF6 is formed in the reaction of Related Products of 33100-27-5

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Coordination compounds built on metal surfaces

The vigorous development of Nanotechnology and Nanoscience has induced a more intense study on coordination compounds built on metal surfaces of different types, such as flat surfaces, electrodes and nanoparticles. Both self-assembled coordination compound and metal surface tend to modify their properties in such a degree that even new ones can arise. In this review the state-of-art of this new field in Coordination Chemistry is analyzed. Especial attention has been given to the general procedures used to build coordination compounds on metal surfaces.

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Stable Borane Adducts of Alcoholates and Carboxylates

Six adducts of B(C6F5)3 and archetypical alcoholates and carboxylates, were prepared and isolated as crystalline sodium crown ether salts, [Na(15-crown-5)][CH3O¡¤B(C6F5)3] (1), [Na(15-crown-5)][CH3CH2O¡¤B(C6F5)3] (2), [Na(15-crown-5)][HCO2¡¤B(C6F5)3] (3), [Na(15-crown-5)][(H3CCO2¡¤B(C6F5)3] (4), [Na(15-crown-5)][(F3CCO2¡¤B(C6F5)3] (5), and [Na2(15-crown-5)3][C2O4¡¤2 B(C6F5)3] (6). All compounds were fully characterized by multinuclear NMR- and IR spectroscopy, ESI MS spectrometry, and X-ray crystallography.

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Solvent Effects on Extraction of Sodium Picrate with 15-Crown-5. The Determination of Ion-Pair Formation Constant of Crown Ether-Metal Salt 1:1:1 Complex in Water

In order to determine the ion-pair formation constant of a crown ether-metal salt complex (1:1:1) in water, an equation is derived from the regular solution theory.Then, the theoretical predictions are verified experimentally by solvent extraction with 15-crown-5 (15C5), sodium picrate (NaA), and various organic solvents of low dielectric constant.The partition constants of 15C5 and the actual overall extraction constants of NaA with 15C5 were determined at 25 +/- 0.2 deg C.The partition constants of the Na(15C5)A complex are calculated from these data, the literature value for the complex-formation constant of Na(15C5)+ in water, and the ion-pair formation constant (KNa(15C5)A) in water determined in this study (log KNa(15C5)A = 4.09 +/- 0.23 at 25 deg C).The distribution behavior of 15C5 and Na(15C5)A is explained by the regular solution theory.The obtained molar volumes V/cm3 mol-1 and solubility parameters delta/cal1/2 cm-3/2 are as follows; V15C5 = 189 +/- 34, VNa(15C5)A = 215 +/- 46, delta15C5 = 12.0 +/- 0.1, and deltaNa(15C5)A = 12.0 +/- 0.1.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, COA of Formula: C10H20O5

Synthesis of Well-Defined Bicapped Octahedral Iron Clusters [(trenL)2Fe8(PMe2Ph)2]n (n=0, -1)

The synthesis of polynuclear clusters with control over size and cluster geometry remains an unsolved challenge. Herein, we report the synthesis and characterization of open-shell octairon clusters supported by two heptaamine ligands [o-H2NC6H4NH(CH2)2]3N (trenLH9). The crystal structure of the all-ferrous species ([trenL)2Fe8(PMe2Ph)2] (1) displays a bicapped octahedral geometry with Fe-Fe distances ranging from 2.4071(6) to 2.8236(5) A, where the ligand amine units are formally in amine, amide, and imide oxidation states. Several redox states of the octairon cluster are accessible, as ascertained using cyclic voltammetry. The one-electron-reduced clusters [M]+[(trenL)2Fe8(PMe2Ph)2]- (M=Bu4N (2 a); (15-crown-5)Na(thf) (2 b)) were isolated and characterized. Variable-temperature magnetic susceptibility data indicates that the exchange coupling within the [Fe8] core is antiferromagnetic which is attenuated upon reduction to the mixed valent anion.

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Chiral Catalysts,
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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, name: 1,4,7,10,13-Pentaoxacyclopentadecane

Studies on transport of Pb(II) ions using different crown ethers

Membrane based separation processes represent a sophisticated way to limit industrial wastes in the natural environment. Crown ethers have been recognized as very effective class of compounds to achieve selective separation of heavy metal ions from aqueous solutions. Lead (Pb) is a well known toxic metal and is heavily used in industry. Therefore, finding ways to selectively remove Pb(II) from aqueous solutions is important. In the present paper, different crown ethers of varying cavity size, subsituent groups, donor atoms, and ring number are compared for their ability to transport Pb2+ through a supported liquid membrane. All experiments were carried out in a laboratory scale membrane reactor with crown ether solution immobilized on a polypropylene porous sheet interposed between feed and strip solutions. It was observed that when O atoms of the same sized macrocycle are replaced with N or S atoms, percentage recovery of Pb(II) increases significantly. By substituting a benzene ring on the same sized macrocycle, the percentage of Pb(II) transport increased from 78 to 86%. The cavity size of the crown ether seems to affect the rate of transport. After different trials, it was found that transport is maximal where the ionic radius of Pb(II) matches maximum with the cavity diameter of the macrocycle. These interactions of crown ethers with Pb(II) are explained on the basis of metal-ligand coordination chemistry.

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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. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane

Formation of p-phenylenediamine-crown ether-[PMo12O 40]4- salts

Electron transfer from the electron donor of p-phenylenediamine (PPD) to the electron acceptor of (H+)3[PMo12O 40]3- forms a one-electron-reduced Keggin cluster of [PMO12O40]4-, bearing a S = 1/2 spin, while proton transfer from the proton donor of (H+)3[PMO 12O40]3- to the proton acceptor of PPD yielded mono- and diprotonated cations of 4-aminoanilinium (HPPD+) and p-phenylenediammonium (H2PPD2+). By introduction of crown ether receptors during the crystallization process, supramolecular cations of (HPPD+)(crown ethers) and/or (H2PPD2+)(crown ethers) were successfully introduced into three new alpha-[PMo 12O40]4- salts of (H2PPD 2+)2([12]crown-4)4[PMo12O 40]4- (1), (HPPD+)4-([15]crown-5) 4[PMo12O40]4- (2), and (HPPD +)2(H2PPD2+)([18]crown-6) 4[PMo12O40]4- (3) as the countercation. The protonated states of PPD and moleoular-assembly structures of the supramolecular cations depended on the size of the crown ethers. In salt 3, a novel mixed-protonated state of HPPD+ and H2PPD 2+ was confirmed to be complexed in the cation structure. According to the changes in the cation structures, the anion arrangements were modulated from those of the two-dimensional layer for salt 1 to the isolated cluster for salts 2 and 3. The temperature-dependent magnetic susceptibilities of salts 1-3 were consistent with the isolated spin arrangements of [PMo12O 40]4-. The electronic spectra of salts 1-3 indicated the intervalence optical transition from pentavalent MoV to hexavalent MoVI ions within the [PMo12O40]4- cluster. Temperature-dependent electron spin resonance spectra of salt 2 revealed the delocalization-localization transition of the S = 1/2 spin at 60 K. The spin on the [PMo12O40]4- cluster was localized on a specific MoV site below 60 K, which was thermally activated with an activation energy of 0.015 eV.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 33100-27-5, in my other articles.

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Propene/propane separation with copolyimide membranes containing silver ions

The aim of this project was to produce crosslinked, plasticization resistant facilitated transport membranes which can be used for the separation of olefin/paraffin mixtures. Different crosslinkable 4,4?-hexafluoro- isopropylidene diphthalic anhydride (6FDA) based copolyimides were synthesized using 3,5-diamino benzoic acid as one of the monomers providing a crosslinkable group and 15-crown-5-ether diamine suitable for creating facilitated transport sites. Crown ethers are well known for strong complexation of light metal ions but also complex formation with silver ions is possible. Thereby the ions are bonded into the cavity of the crown ether. The main advantage of this type of facilitated transport polymers is that no carrier medium is necessary which means “dry” membranes can be applied. Separation characteristics for the 15-crown-5-ether copolyimides were determined by pure gas sorption and mixed gas permeation experiments using propene and propane up to feed pressures of 8 ¡Á 105 Pa (8 bar) at a membrane temperature of 35C. Besides this a short overview on facilitated transport membranes is given discussing the several existing mechanisms as well as membrane materials investigated in the last years.

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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. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Quality Control of: 1,4,7,10,13-Pentaoxacyclopentadecane

Structure of *15-crown-5

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