Category: 14098-44-3

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, Quality Control of: Benzo-15-crown-5

Photoswitchable molecular receptors

The review describes photoswitchable molecular receptors based on crown-ether systems. The important feature of the systems is reversible change in the capacity of a photochromic host molecule for association with guests upon irradiation. From the other side, the exploration of the complex formation process in crown-ether systems leads to a novel approach to the modification of photochromic behavior. The results obtained show that the introduction of crown-ether moieties into dye molecules affords compounds that can change their spectral and photochromic properties upon complex formation. The researchers believe that the novel photochromic systems can now be regarded as being promising for traditional applications (photochromic ophthalmic lenses or camera filters, reversible holographic systems and cosmetics) and molecular electronics, biomimetic chemistry, and optical information storage.

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Related Products of 14098-44-3, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a patent, introducing its new discovery.

ESR Studies of Cooper(II) Ion Doped in Single Crystal of Benzo-15-crown-5 Complex

Angular-dependent ESR measurements were carried out at 77 K for 65Cu(II) ions doped in a single crystal of benzo-15-crown-5 (B15C5) magnesium complex.Not only the allowed resonance lines of cooper(II) ions, but also the forbidden lines arising from a nuclear quadrupole interaction were observed.Based on an analysis of the single crystal ESR spectra, the spin Hamiltonian containing the quadrupole term was determined for a B15C5-65Cu(II) complex having a 3dz2 ground state in a B15C5-Mg(II) solid matrix.

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14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 14098-44-3, Formula: C14H20O5

Facile Synthesis of Bis(crown ether)benzils: Prospective Building Blocks for Metal Ion Sensors

A new facile synthetic route to benzils containing fragments of 12-crown-4, 15-crown-5, and 18-crown-6 by oxidation of corresponding stilbenes was developed. The first representative of a new family of fluorescent sensors was obtained by reaction of bis(15-crown-5)benzil with o-phenylenediamine. The latter exhibits great fluorescence enhancement upon association with K+ and Rb+ compared to Na+ and Cs+.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C14H20O5. In my other articles, you can also check out more blogs about 14098-44-3

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Binuclear and mononuclear di-eta5-cyclopentadienylniobium chemistry: a new insight. Crystal and molecular structure of –+

A mononuclear di-eta5-cyclopentadienylniobium complex Cp2NbH2Na (I) has been found to be a by-product of the reaction of Cp2NbCl2 with NaH, the principal products being (eta5 : eta1-C5H4)2Cp2Nb2H2 (II) in THF and (eta5 : eta5-C5H4C5H4)Cp2Nb2(mu-H)2 (III) in DME.Cp2NbH2Na was also obtained by reaction of Cp2NbH3 or the mixture Cp2NbBH4 + Et3N with NaH.Crystal and molecular structure of –+ (Ia) (B15C5 = benzo-15-crown-5) was established by an X-ray diffraction study (4208 reflections, R = 0.022; monoclinic, at -120 deg C, a 17.345(3), b 11.742(3), c 22.965(5) Angstroem, beta 98.52(1) degree, Z = 8, space gr oup C2/c).The structural data indicate substantial ionic character of the (Cp2NbH2)-…(Na*B15C5)+ interaction in the solid.

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Polytopic Ligand Systems: Synthesis and Complexation Properties of a ‘Crowned’ Phthalocyanine

The synthesis is described of a phthalocyanine that contains four 15-crown-5 rings; K(1+) ions induce dimerization of the phthalocyanine, whereas Li(1+) and t-BuNH3(1+) ions do not.

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Orbital Levels of Crown Ethers and Related Macrocycles Studied by Ultraviolet Photoelectron Spectroscopy; Relationship to Coplexation Studies

Ultraviolet photoelectron spectroscopy has been used to measure the valence-shell ionization potentials of several crown ethers and other macrocyclic ligands.A comparison is made with results for corresponding open-chain and other model compounds.In general, evidence is found for apperciable through-bond or through-space interactions among the heteroatom Ione-pair orbitals in the macrocyclic molecules, making these molecules softer ligands than would otherwise be anticipated.

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Synthesis of Adamantylbenzo-Crown Ethers

The procedure of synthesis of 4?-adamantylbenzo-crown ethers by direct alkylation of benzocrown ethers with adamantanol in the presence of boron trifluoride diethyl etherate as a catalyst is proposed.

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THE SYNTHESIS OF SOME AROMATIC CROWN ETHER DERIVATIVES AND THEIR ION-SELECTIVE ELECTRODE PROPERTIES

The synthesis of alkyl, nitro and halogeno derivatives of benzo-15-crown-5, benzo-18-crown-6 and naphtho-15-crown-5 has been reported.Also some novel ester type bis(crown ether)s have been prepared.Some of the compounds have been characterized as electroactive substances in PVC membrane ion-selective electrodes.

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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.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3, Recommanded Product: Benzo-15-crown-5

Thermodynamics of Solvent Extraction of Metal Picrates with Crown Ethers: Enthalpy-Entropy Compensation. Part 1. Stoicheiometric 1:1 Complexation

Quantitative solvent extractions were performed in the water-dichloromethane system at 10-25 deg C to give the extraction equilibrium constants (Kex) and the thermodynamic quantities (DeltaH0 and DeltaS0) for the ion-pair extraction of aqueous alkali (Li(1+)-Cs(1+)), alkaline earth (Ca(2+)-Ba(2+)), and some heavy metal (Ag(1+), Tl(1+)) picrates with 15-crown-5, benzo-15-crown-5, cis-cyclohexano-15-crown-5, 16-crown-5, 15-(2-methoxyethoxy)methyl-15-methyl-16-crown-5, 18-crown-6, dibenzo-18-crown-6, and dibenzo-24-crown-8.The cation-binding abilities and relative cation selectivities of the ligands are discussed from the thermodynamic point of view.Global treatment of the thermodynamic data obtained in the present and previous works reveals not only that, as is the case with the complexation in the homogeneous phase, the enthalpy-entropy compensation effect holds in the solvent extraction system, but also the DeltaH0 vs.TDeltaS0 plot affords the characteristic slope (alpha) and intercept (TDeltaS0) which are comparable to the corresponding values obtained for the homogeneous-phase complexation.This indicates that the conformational change and the extent of desolvation upon cation binding by crown ethers are quite analogous both in the homogeneous phase and in the solvent extraction beyond the apparent differences in the phase and the complexed species involved.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 14098-44-3 is helpful to your research., Recommanded Product: Benzo-15-crown-5

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Electric Literature of 14098-44-3, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article£¬once mentioned of 14098-44-3

Solid-state 23Na nuclear magnetic resonance of sodium complexes with crown ethers, cryptands, and naturally occurring antibiotic ionophores: A direct probe to the sodium-binding sites

We report a systematic solid-state 23Na nuclear magnetic resonance study of sodium complexes with crown ethers, cryptands, and naturally occurring antibiotic ionophores. Precise information about 23Na quadrupole coupling constants and chemical shifts was determined from analysis of 23Na magic-angle spinning (MAS) NMR spectra. We found that the experimental 23Na chemical shifts can be related to an empirical parameter that is a function of the atomic valence of the donor ligand, the Na+-ligand distance, and the coordination number (CN) around the Na+ ion of interest. A reasonably good correlation was also observed between the 23Na quadrupole parameters measured in CDCl3 solution and those measured in the solid state, indicating that the cation exchange is slow in CDCl3. In MeOH solution, however, neither 23Na quadrupole parameters nor chemical shifts of the Na-ionophore complexes show correlation with the corresponding solid-state data. Finally, we report the 23Na chemical shift tensor in Na(12C4)2ClO4: delta11 = delta22 = -1 ppm and delta33 = -15 ppm.

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 14098-44-3 is helpful to your research., Electric Literature of 14098-44-3

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