Category: 14098-44-3

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 14098-44-3, C14H20O5. A document type is Article, introducing its new discovery., Formula: C14H20O5

A new series of benzo-15-crown-5 adducts with hydrated lanthanide (La, Pr, Nd, Sm, Eu, Gd, Er) picrates has been obtained. Elemental analyses indicated that their stoichiometry is 1:2:3 (metal : benzo-15-crown-5 : picrate) except for the lanthanum adduct. X-ray structural analysis of the Nd, Sm and Er adducts revealed that Nd, Sm or Er ions coordinate directly with water molecules and the picrate anion. The benzo-15-crown-5 acts as a second-sphere ligand which associates with the Nd, Sm or Er ion through hydrogen bonding by coordinating water molecules. From investigation of the IR and UV-vis spectra of the adducts, it can be deduced that the adducts, except lanthanum, exhibit a similar molecular structure to that of the Nd, Sm and Er adducts. These new adducts may also be classified as supermolecules because each is an associate of two chemical species of hydrated lanthanide picrate and benzo-15-crown-5 held together by coordination water molecules. Copyright

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In an article, published in an article, once mentioned the application of 14098-44-3, Name is Benzo-15-crown-5,molecular formula is C14H20O5, is a conventional compound. this article was the specific content is as follows.Application In Synthesis of Benzo-15-crown-5

Reaction of an aqua regia solution of gold metal with 15-crown-5 and its derivatives results in the formation of the hydrogen bonded aggregates [H7O3][AuCl4]·15-crown-5 1 and [H5O2][AuCl4]-(benzo-15-crown-5)2 2; complex 1 exhibits a complex, cross-linked structure in which the H7O3+ unit hydrogen bonds to two adjacent crown ethers and a chloride ligand of the anion; the AuIII centre also engages in long-range interactions wtih the crown oxygen atoms.

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Synthetic Route of 14098-44-3, An article , which mentions 14098-44-3, molecular formula is C14H20O5. The compound – Benzo-15-crown-5 played an important role in people’s production and life.

The solvent extraction of rubidium and caesium picrates has been studied at 25 deg C with mixtures of crown ether and tributyl phosphate (TBP) or trioctylphosphine oxide (TOPO) in benzene, and the adduct-formation constants in the benzene solution have been calculated. The crown ethers used in this work were 12-crown-4 (12C4), 15-crown-5 (15C5), and benzo-15-crown-5 (B15C5). The stoichiometric composition of any extracted complex under the present experimental conditions is alkali metal ion : crown ether : TBP or TOPO : picrate ion = 1:1:1:1. The TOPO complex is more extractable than the corresponding TBP complex. The extractability of the Rb+ complex is larger than that of the corresponding Cs+ complex. For both TBP and TOPO, the adduct-formation constant value sequences of Rb+ and Cs+ are B15C5>12C4>15C5> and 12C4>B15C5>15C5, respectively.

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Synthetic Route of 14098-44-3, An article , which mentions 14098-44-3, molecular formula is C14H20O5. The compound – Benzo-15-crown-5 played an important role in people’s production and life.

It was shown by means of PMR and IR spectroscopy that benzocrown ethers with sulfonyl-containing exocyclic groups are able to form complexes with alkali-metal cations and also with neutral molecules.The electron-acceptor sulfonyl groups lower the ionophoric activity of benzocrown ethers while retaining cationic selectivity.Sulfonyl containing benzocrown ethers derived from benzo-15-crown-5 form sandwich complexes with potassium ions, which arises from the inversion of the selectivity of ionic transport in favor of potassium.A sulfonyl-containing bridge between the polyether rings in biscrown ethers has a determining influence on the rate and selectivity of the ionic transport.

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Three coumarin reagents carrying crown-ether moieties as catalytic sites for the fluorescence derivatization of carboxylic acids were designed and synthesized.The catalytic abilities of these reagents were evaluated based on the stability constants (Ks) for complexation with metal acetates in methanol.The derivatization reactions of carboxylic acids with these reagents proceeded self-catalytically without crown-ether catalysts, and gave the corresponding coumarin esters in good yields.It was found their reactivities significantly dependent upon the metal-binding ability of the reagent molecules from kinetic treatments of the reactions.The derivatized products showed remarkably high fluorescence quantum yields of above 0.8 in methanol.These results suggested that the functionalization of reagents was a quite useful approach for the development of new-type analytical reagents.

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Two ditopic uranyl salophen receptors with benzo-15-crown-5 and benzo-18-crown-6 units (R1 and R2, respectively) have been synthesized from commercially available starting materials. Comprehensive studies on the solid-state ion pair complexation with various alkali and ammonium halides have been conducted. From the 19 obtained solid-state structures (6 structures with R1, 13 structures with R2), three general interaction motifs I-III have been observed. Interaction motif I has a separated ion pair with the cation coordinated to the crown ether unit, and the anion or oxygen containing solvent molecule coordinated to the uranyl center. The interaction motif II manifests a polymeric structure with a contact ion pair between the uranyl-coordinated anion and cation coordinated in the crown ether in the adjacent receptor. Interaction motif III consists of a more general stacked packing structure of the receptors with or without ion pairs. From the obtained solid-state structures, the complex R2·NaI shows an interesting formation of infinite coordination polymeric structure where the crown ether complexed sodium cations and the O=U=O units of the adjacent receptors form a nearly linear 1-D chains. In the course of this work also the first solid-state structure of uranyl salophen acetate complex was obtained (R2·KAcO).

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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, Recommanded Product: Benzo-15-crown-5

Nanocomposites of benzo 15-crown-5 ether substituted oligo phenylene vinylene (CE-OPV) were prepared by solution intercalation into a surface treated bentone clay, B34, in both the presence and absence of Eu3+ ions, and were characterized using X-ray diffraction (XRD) and fluorescence techniques. The intercalation of B34 by CE-OPV increases the d-spacing (gallery height) of B34, the increase being more in the presence of metal ion than in its absence. The increase in d-spacing of a related material, poly[1,4,-(2,5-bis (tetra ethylene oxide substituted)) phenylene vinylene (EO-PPV)] due to intercalation into clay is greater than that by CE-OPV. Results on intercalation of small benzo-crown ether molecules themselves into B34 in the presence and absence of Eu3+, are also presented to help elucidate the process. The fluorescence emission maxima of the nanocomposites of CE-OPV, CE-OPV-Eu 3+ and EO-PPV showed a steady blue shift as a function of B34 composition and the results are explained in terms of partial intercalation of the fluorophores into the clay.

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Chiral Catalysts,
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The present paper reports the crystal structure and luminescent properties of bis(benzo-15-crown-5)europium(II) diperchlorate. The structure is composed of complex bis(benzo-15-crown-5)europium(II) cations and perchlorate anions. The complex cation is centrosymmetric, and the metal ion is surrounded by 10 oxygen atoms of two ligand molecules. The compound shows very bright luminescence at 23450 cm-1. The emission parameters (wavelength and the average lifetime of the excited state) are compared to those previously reported for the analogous complex in methanol solutions. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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An expanded series of pi-bound molybdenum-quinonoid complexes supported by pendant phosphines has been synthesized. These compounds formally span three protonation-oxidation states of the quinonoid fragment (catechol, semiquinone, quinone) and two different oxidation states of the metal (Mo0, MoII), notably demonstrating a total of two protons and four electrons accessible in the system. Previously, the reduced Mo0-catechol complex 1 and its reaction with dioxygen to yield the two-proton/two-electron oxidized Mo0-quinone compound 4 was explored, while, herein, the expansion of the series to include the two-electron oxidized MoII-catechol complex 2, the one-proton/two-electron oxidized Mo-semiquinone complex 3, and the two-proton/four-electron oxidized MoII-quinone complexes 5 and 6 is reported. Transfer of multiple equivalents of protons and electrons from the Mo0 and MoII catechol complexes, 1 and 2, to H atom acceptor TEMPO suggests the presence of weak O-H bonds. Although thermochemical analyses are hindered by the irreversibility of the electrochemistry of the present compounds, the reactivity observed suggests weaker O-H bonds compared to the free catechol, indicating that proton-coupled electron transfer can be facilitated significantly by the pi-bound metal center.

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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

In synthesis of symmetrical and unsymmetrical dibenzo crown ethers, the use of dimethyl sulfoxide as a solvent in cyclization allows an increase in the yields, a significant reduction in the reaction time, and simplification of refining.

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Chiral Catalysts,
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