Category: 33100-27-5

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, Formula: C10H20O5.

ETUDE CRISTALLOGRAPHIQUE DU DIAQUA(15-COURONNE-5 ETHER) ZINC(II) NITRATE ET PAR R.P.E. DE CE COMPOSE DOPE AU CUIVRE(II)

The crystallographic structure of diaqua (pentaoxa 1,4,7,10,13 cyclopentadekane)Zinc(II)nitrate ( (NO3)2) has been established by three-dimensional X-ray analysis from diffractometer data.The compound is monoclinic (space group Pc) with a = 14.714(2), b = 14.066(2), c = 26.108(3) Angstroem, beta = 96.83 deg, Z = 12 (6 independent molecules).Zinc admits coordination number SEVEN (5 oxygen atoms from the crown-ether and two water molecules).The six independent units are very similar and their differences consist mainly in their orientations.The ESR parameters of the title compound doped with Copper(II) were measured at N.T. on a single crystal.One found: g3 = 2.001, g2 = 2.325, g1 = 2.373; A3 = 110 G (103.10-4 cm-1), A2 = 10 G (11.10-4 cm-1), A1 = 37 G (41.10-4 cm-1).These values can be accounted for by admitting a substitutional localization of the doping ion.The g and A principal values and the optical data could be reproduced within the framework of an A.O.M. calculation with the following parameters: (e?)o1 to o5 = ca. -4 600 cm-1, (e?)o6,o7 = ca. -5 300 cm-1, e?c/e? = e?s/? = 0,2; k1 = k2 = 0,94, k3 = 1; kappa = 0,2, P = 320.10-4 cm-1.Keywords – RPE ESR Copper(II), Zinc(II) Pentaoxa 1,4,7,10,13 cyclopentadecane 15-crown-5 ether

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C10H20O5. In my other articles, you can also check out more blogs about 33100-27-5

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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 Chapter£¬once mentioned of 33100-27-5, Quality Control of: 1,4,7,10,13-Pentaoxacyclopentadecane

Synthesis of fluorescent membrane-spanning lipids for studies of lipid transfer and membrane fusion

For uncompromised in vitro assays for intermembrane lipid transfer and membrane fusion fluorescent membrane-spanning lipids have proved to be invaluable tools. These lipids in contrast to phosphoglycerolipids and sphingolipids are resistant to spontaneous as well as protein-mediated intermembrane transfer. Here I describe the synthesis of some homo-substituted fluorescent bipolar membrane-spanning lipids that bear a fluorescent tag either directly or via a phosphoethanolamine spacer to the lipid core. For the synthesis the lipid core of the bipolar membrane-spanning lipids, i.e., the tetraether lipid caldarchaeol, is prepared from cultures of the archaea Thermoplasma acidophilum.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Quality Control 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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33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 33100-27-5, COA of Formula: C10H20O5

Partition coefficients and equilibrium constants of crown ethers between water and organic solvents determined by proton nuclear magnetic resonance

The extraction of water by several crown ethers into chloroform + carbon tetrachloride mixtures has been investigated using a proton NMR technique. The equilibrium is well described by formation of a 1:1 water-crown complex in rapid exchange with uncomplexed ligand and water. The fraction (k) of crown ether complexed with water increases with crown cavity size, varying from (15 ¡À1)% for 12-crown-4 to (97 ¡À5)% for 18-crown-6. Addition of carbon tetrachloride to chloroform lowers the k value for all crown ethers in equilibrium with water, and the value is close to zero in pure CCl4. The partition coefficient follows the opposite trend: the amount of crown ether in the organic phase increases with the percentage of CCl4 in this phase. The chemical shifts of free and complexed water also vary with solvent composition. Interaction of water with crown ether depends on solvation environment and may play a significant role in liquid-liquid extraction of metal ions using macrocyclic polyethers as extractants.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.COA of Formula: C10H20O5. In my other articles, you can also check out more blogs about 33100-27-5

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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, category: chiral-catalyst

Carbene complex formation versus cyclometallation from a phosphoryl-tethered methanide ruthenium complex

An oxophosphoryl-substituted methanide ligand system for transition metal complexes has been synthesized and isolated as the sodium salt Na[Ph2P(O)?C(H)?SO2Ph]. This ligand features structural components known to enable the isolation of nucleophilic late transition metal carbene complexes. The corresponding ruthenium(cymene) chlorido complex was readily available by simple salt metathesis reaction. However, in contrast to previously reported thio- and iminophosphoryl-tethered ligand systems, dehydrohalogenation of the chlorido complex led to the formation of a cyclometallated ruthenium complex instead of the carbene complex. All compounds have been characterized in solution and solid state. Additional density functional theory (DFT) studies have been performed to elucidate the mechanism of the observed cyclometallation and to shed light on the effects of different P(V) groups in the ligand system on the stability and reactivity of the corresponding carbene complexes. The calculations show that the weaker coordination of the P[dbnd]O compared to the P[dbnd]S or P[dbnd]N moiety is responsible for the more facile C?H activation.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.category: chiral-catalyst. In my other articles, you can also check out more blogs about 33100-27-5

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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, Product Details of 33100-27-5

Electrolyte systems for primary lithium-fluorocarbon power sources and their working efficiency in a wide temperature range

New compositions of liquid organic electrolytes with working temperatures of up to?50? were developed for low-temperature primary Li/CFx power sources. Five different compositions of organic electrolytes with a 15-crown-5 (2 vol %) addition and without it were studied on laboratory Li/CFx power sources. 1?LiBF4 (LiPF6) in an ethylene carbonate/dimethyl carbonate/methyl propionate/ethylmethyl carbonate (EC/DMC/MP/EMC) (1: 1: 1: 2) mixture and 1 ? LiPF6 in an EC/DMC/EMC (1: 1: 3) mixture each with a 15-crown-5 (2 vol %) addition were found to be the best compositions of organic electrolytes with working temperatures of up to?50?. The electrochemical tests at 20 and?50? in the Li/CFx system showed that the 15-crown-5 addition increased the length of the discharge plateau at?50? three- or fourfold. The mechanisms responsible for the increase in the discharge capacity of the CFx cathode in the presence of a crown ether addition were suggested.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Product Details of 33100-27-5, 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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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, Product Details of 33100-27-5

A high temperature reversible phase transition in a supramolecular complex of 15-crown-5 with tetraphenylboron sodium

A supramolecular crystal, [Na(15-crown-5)][BPh4] (1), (15-crown-5 = 1,4,7,10,13-pentaoxacyclopentadecane, NaBPh4 = sodium tetraphenylboron), has been obtained by mixing the ethanol solution of 15-crown-5 and NaBPh4 in the molar ratio of 1:1. The crystal structure was determined at 293 K, revealing that two [Na(15-crown-5)]+ cations form a supramolecular dimer via sharing one side-edge of coordination pentagonal pyramids; also, there are significant H-bonding interactions between anions and supramolecularly dimeric cations. Differential scanning calorimetry (DSC) showed that 1 undergoes a reversible first-order phase transition at ca. 391 K (Tc) upon heating, with a thermal hysteresis of 19 K. DeltaH and DeltaS were estimated to be 6.9 kJ mol-1 and 17.7 J mol-1 K-1, respectively, in the heating run. The variable-temperature powder X-ray diffraction and dielectric spectra were collected, and both disclosed no significant difference between the low- and high-temperature phases. These results suggest that the phase transition is an ordered-disordered type, which probably involves the change of anion configuration.

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.Product Details of 33100-27-5, you can also check out more blogs about33100-27-5

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33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 33100-27-5, name: 1,4,7,10,13-Pentaoxacyclopentadecane

Simultaneous separation of common mono- and divalent cations on a calcinated silica gel column by ion chromatography with indirect photometric detection and aromatic monoamines-oxalic acid, containing crown ethers, used as eluent

The application of unmodified silica gel (Super Micro Bead Silica Gel B-5, SMBSG B-5) as a cation-exchange stationary phase in ion chromatography with indirect photometric detection (IC-IPD) for the separation of common mono- and divalent cations (Li+, Na+, NH4+, K+, Mg2+ and Ca2+) was carried out using various aromatic monoamines {tyramine [4-(2-aminoethyl)phenol], benzylamine, phenylethylamine, 2-methylpyridine and 2,6-dimethylpyridine} as eluents. When using these amines as eluents, the peak resolution between these mono- and divalent cations was not quite satisfactory and the peak shapes of NH 4+ and K+ were largely destroyed on the SMBSG B-5 silica gel column. Hence, the application of SMBSG B-5 silica gel calcinated at 200, 400, 600, 800 and 1000C for 5 h in the IC-IPD was carried out. The peak shapes of the monovalent cations were greatly improved with increasing calcination temperature and, as a result, symmetrical peaks of these mono- and divalent cations were obtained on the SMBSG B-5 silica gel calcinated at 1000C as the stationary phase. In contrast, the peak resolution between these mono- and divalent cations was not improved. Therefore, crown ethers [18-crown-6 (1,4,7,10,13,15-hexaoxacyclooctadecane), 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane)] were added to the eluent for the complete separation of these mono- and divalent cations. Excellent simultaneous separation and highly sensitive detection at 275 nm were achieved in 25 min on a column (150¡Á4.6 mm I.D.) packed with SMBSG B-5 silica gel calcinated at 1000C by elution with 0.75 mM tyramine-0.25 mM oxalic acid at pH 5.0 containing either 1.0 mM 18-crown-6 or 10 mM 15-crown-5.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.name: 1,4,7,10,13-Pentaoxacyclopentadecane. In my other articles, you can also check out more blogs about 33100-27-5

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Electric Literature of 33100-27-5. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane. In a document type is Article, introducing its new discovery.

Cavity-size-dependent dissociation of crown ether/ammonium ion complexes in the gas phase

Ion complexes of crown ethers and amine substrates were generated by liquid secondary ion mass spectrometry (LSIMS). The ammonium ions were produced from the precursors: ammonium chloride, methylammonium and hydrazinium hydrochlorides, methylhydrazine sulfate, and tosylhydrazine. The effective hydrogen bonds between the ammonium ions and multi-oxygen receptors are the predominant binding interactions in the complex formation. Results of collision-induced dissociation (CID) of the ion complexes at 7 and 0.4 keV show two strikingly different types of fragmentation pathways. At the lower collision energy, the dominant dissociation pathways involve decomplexation in conjunction with losses of ethylene oxide units from the resulting protonated ether molecules, which are the fragmentation processes previously observed for dissociation of protonated crown ethers. In addition, metastable ions corresponding to decomplexation of neutral amines from the polyether/ammonium ion complexes by intramolecular proton transfer are also observed. Higher collision energy activation and dissociation of the ion complexes proceed by intramolecular ring-opening reactions which result in odd-electron, acyclic product ion structures. These ring-opening reactions are significantly favored over the simple eliminations of ethylene oxide units as the cavity sizes of the crown ethers increase and the strengths of hydrogen-bonding interactions increase. Hydrazinium and methylhydrazinium ion complexes dissociate via macrocyclic ring-opening pathways that result in the loss of hydroxymethylene radical. This ring-opening reaction is the dominant dissociation pathway when the host cavity is large enough to encapsulate the hydrazinium ion, such as for 18-crown-6 and 21-crown-7. In contrast, ion complexes of crown ethers with tosylhydrazines dissociate by covalent bond cleavage of the nitrogen-sulfur bond of the guest substrate. These results suggest that the association energy for the multiple hydrogen-bonding interactions of the crown ether/ammonium ion complex is on the same order of the covalent macrocyclic or nitrogen-sulfur bonds.

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In an article, published in an article, once mentioned the application of 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane,molecular formula is C10H20O5, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 33100-27-5

Thermochemical behaviour of crown ethers in the mixtures of water with organic solvents: Part VII. Enthalpy of solution of 15-crown-5 and benzo-15-crown-5 in the mixtures of water with acetone at 298.15 K

Enthalpy of solution of crown ethers (15-crown-5 and benzo-15-crown-5) in water-acetone mixtures have been measured within the whole range of mole fraction at 298.15 K. The obtained data have been compared with those of the solution enthalpy of both crown ethers in the mixtures of water with dimethyl sulfoxide. The replacement of -S=O group with -C=O in the molecule of the organic solvent brings about an increase in the exothermic effect of the solution of 15-crown-5 and benzo-15-crown-5 ethers, especially in the mixtures with a medium water content. The observed effect is connected with the preferential solvation of the molecules of both crown ethers by acetone molecules in the water-acetone mixtures. The process of preferential solvation of 15-crown-5 and benzo-15-crown-5 ethers does not take place in the water-dimethyl sulfoxide mixture.

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33100-27-5. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane. In a document type is Article, introducing its new discovery.

Cavity-size-dependent dissociation of crown ether/ammonium ion complexes in the gas phase

Ion complexes of crown ethers and amine substrates were generated by liquid secondary ion mass spectrometry (LSIMS). The ammonium ions were produced from the precursors: ammonium chloride, methylammonium and hydrazinium hydrochlorides, methylhydrazine sulfate, and tosylhydrazine. The effective hydrogen bonds between the ammonium ions and multi-oxygen receptors are the predominant binding interactions in the complex formation. Results of collision-induced dissociation (CID) of the ion complexes at 7 and 0.4 keV show two strikingly different types of fragmentation pathways. At the lower collision energy, the dominant dissociation pathways involve decomplexation in conjunction with losses of ethylene oxide units from the resulting protonated ether molecules, which are the fragmentation processes previously observed for dissociation of protonated crown ethers. In addition, metastable ions corresponding to decomplexation of neutral amines from the polyether/ammonium ion complexes by intramolecular proton transfer are also observed. Higher collision energy activation and dissociation of the ion complexes proceed by intramolecular ring-opening reactions which result in odd-electron, acyclic product ion structures. These ring-opening reactions are significantly favored over the simple eliminations of ethylene oxide units as the cavity sizes of the crown ethers increase and the strengths of hydrogen-bonding interactions increase. Hydrazinium and methylhydrazinium ion complexes dissociate via macrocyclic ring-opening pathways that result in the loss of hydroxymethylene radical. This ring-opening reaction is the dominant dissociation pathway when the host cavity is large enough to encapsulate the hydrazinium ion, such as for 18-crown-6 and 21-crown-7. In contrast, ion complexes of crown ethers with tosylhydrazines dissociate by covalent bond cleavage of the nitrogen-sulfur bond of the guest substrate. These results suggest that the association energy for the multiple hydrogen-bonding interactions of the crown ether/ammonium ion complex is on the same order of the covalent macrocyclic or nitrogen-sulfur bonds.

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