Category: 33100-27-5

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Stimulus-responsive molecular rotors: Control of rotary motion in triptycene-ionophore systems with s-block metal cations

Triptycene derivatives bearing a pair of ionophores were synthesized and their rotational behaviors were observed with/without s-block metal cations as an external stimulus. In this study, oxyethylene-based ionophores were introduced at both bridgehead positions of triptycene as the stimulus receptors. The NMR experiments revealed the formation of complexes of the triptycenes with the s-block metal cations. We demonstrated that the rate (activation energy) of the internal rotation of the triptycyl moiety could be controlled by the formation of the complexes. We also found that the conformation of those complexes can be controllable with the species of metal cations.

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Ion-pair formation between Cd(II), Na(I), and Ag(I) complex ions with 18-crown-6 ether derivatives and various pairing anions in water: An understanding of the ion-pair formation based on the HSAB principle

The ion-pair formation constants (KMLX0/mol-1 dm3) of CdL2+ with Br- or NaL+ with N, N-diethyldithiocarbamate ion (DDTC-) in water were determined potentiometrically at 25C; ionic strength (I)?0: L denotes 18-crown-6 ether (18C6) and its mono-benzo derivative for the CdBr2-L system and 15-crown-5 ether and 18C6 for the NaDDTC-L one. The formation constant corresponding to the simple salt, NaDDTC, in water was also determined at I?0. Using the log KCdLX0 values of CdLCl+, CdLBr+, CdLPic+, and CdLSO4, then CdL2+ and picrate ion (Pic-) in water have been classified with the hard and soft acids and bases principle, where the values were available in the literature, except for CdLBr+. The same classification was examined in NaX-L systems with X- = DDTC-, trifluoroacetate ion, MnO4-, ReO4-, Pic-, and BPh4- and the AgPic-L one. Consequently, CdL2+, NaL+, and AgL+ were classified as the hard acids, while Pic- and BPh4- as the hard bases. These results reflected the reactivities of the complex ions in ion-pair formation with X- and SO42- in water. 2011 The Japan Society for Analytical 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, HPLC of Formula: C10H20O5

Crown Ethers of Low Symmetry. Spiro Crown Ethers and 16-Crown-5 Derivatives

Spiro crown ethers 3a-c, spiro bis(crown ethers) 5a-e, and the related 16-crown-5 derivatives 6a-d were synthesized and their cation binding abilities were evaluated by study of the extraction of aqueous alkali picrates.Crown ethers carrying 13-crown-4 and 16-crown-5 skeletons showed significant changes in cation selectivity as compared with the corresponding 12-crown-4 and 15-crown-5.Spiro-13-crown-4 3a and spiro-bis<4.4> 5a showed extremely low extractabilities for all cations examined, while the 16-crown-5-derivatives, including spiro-bis<4.5> 5b and spiro-bis<5.5> 5c, showed anomalously high Na+ selectivity.In a quantitative study of extraction equilibrium constants (Kex), 16-crown-5 was again found to have much higher selectivity for Na+ than 15-crown-5.This result is attributed to the less symmetrical spatial arrangement of donor oxygen atoms in 16-crown-5; the symmetry-extractability relationship is discussed on the basis of the size-fit concept.

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Comparison of the Macrocyclic Effect for Ether Hosts in Aqueous and Organic Solvents

Equilibrium constants and enthalpies of host-guest complexation have been determined by calorimetry for cyclic and acyclic polyether hosts with a variety of guests and solvents.The thermodynamic parameters for complexation of group I cation guests by crown ethers in water solvent may be correlated to the hydration enthalpy and relative sizes of cation and ether.The macrocyclic effect is observed for cation-ether systems in water solvent but not for the complexation of malononitrile by ethers in nonpolar aromatic or alcohol solvent.

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A PGSE diffusion and electrophoretic NMR study of Cs+ and Na+ dynamics in aqueous crown ether systems

Multinuclear pulsed gradient spin-echo (PGSE) NMR diffusion and linewidth measurements were used to probe binding and transport in aqueous Na +-15-crown-5, Na+-18-crown-6, Cs+-15-crown-5 and Cs+-18-crown-6 systems. Since direct PGSE observation of many alkali cations is precluded by either low inherent sensitivity or rapid relaxation (or both), the feasibility of proton-detected electrophoretic NMR (ENMR) measurements to complement PGSE data was investigated. ENMR measurements were performed on aqueous Cs+-, Li+-, Na+-, K+-, and Rb+- 18-crown-6 systems. The data analysis is based on a two-site binding model and its corresponding association constants. Cs+ was found to bind considerably more tightly to 18-crown-6 (K = 8 M-1) than to 15-crown-5 (K ? 2 M-1), whereas Na + had almost equal affinity (K ? 4.5 M-1) for 15-crown-5 and 18-crown-6. The difficulties encountered in analysing the NMR parameters, methodological limitations and the implied need for more complicated binding models are discussed. Copyright

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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.HPLC of Formula: C10H20O5

Syntheses and Crystal Structures of the Crown Ether Complexes . (2)2, and NO3

has been prepared by the reaction of Li(12-crown-4)>2Se6 with Cd(O2CCH3)2 in ethanolic solution.The corresponding polyselenide complex of mercury is formed by the reaction of 2Se6 with Hg(O2CCH3)2 in the same solvent.Both compounds form dark red crystals, which were characterized by single crystal X-ray structure determinations.The only product to be isolated from the reaction of Bi(NO3)3*5H2O with 2Se6 in ethanolic solution was NO3, whose structure has also been determined. : space group Pbca, Z = 8, 1404 observed independent reflexions, R = 0.097.Lattice dimensions (19 deg C): a = 1981.5(6), b = 1400.3(1), c = 3268.9(9) pm.The compound forms a dicationic ensemble, in which three lithium ions coordinate with the oxygen atoms of the acetate ion.In the anions the cadmium atom is coordinated tetrahedrally by four selenium atoms of two Se42- units. (2)2: space group P1, Z = 1, 3210 observed independent reflexions, R = 0.055.Lattice dimensions (19 deg C): a = 1057.4(2), b = 1130.6(2), c = 2000.1(2) pm, alpha = 88.52(1) deg, beta = 85.86(1) deg, gamma = 66.22(1) deg.The compound has a complex ionic structure, in which the formula units form centrosymmetric dimers through K-O contacts between two cations.In addition there are K…Se contacts with the spiro-bicyclic anions, which – together with 6 K-O bonds within the crowns – lead to the coordination number of 8 for the remaining potassium ions. NO3: space group P212121, Z = 4, 1211 observed independent reflexions, R = 0.052.Lattice dimensions (20 deg C): a = 912.9(2), b = 989.6(1), c = 1658.3(3) pm.The compound forms ion pairs , in which the sodium atom coordinates with the five oxygen atoms of the crown ether, as well as with two oxygen atoms of the nitrate ion with Na-O bond lengths of 240 and 247 pm. – Keywords: Crown Ether Complexes of Lithium, Sodium, and Potassium, Synthesis, Crystal Structure

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Application of 33100-27-5, 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. 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery.

Sodium Hydro(isothiocyanato)borates: Synthesis and Structures

Sodium thiocyanate reacts in THF solution with 18-crown-6 to give the molecular compound Na(18-crown-6)(THF)NCS (3) with the N atom of the NCS anion oriented towards Na1+. The same reaction with 15-crown-5 yields the ion pair Na(15-crown-5)NCS (4). In contrast, Na(NCS)(py)4, obtained by treating a solution of Na(H3BNCS) in THF with pyridine, yields Na(py)4(NCS) (5), which has a chain structure with hexacoordinate Na atoms coordinated to five N atoms and an S atom. Na(NCS) in THF adds 1 equiv. of BH3 to give Na(H3BNCS)*nTHF. Addition of 18-crown-6 to this solution yields crystals of the salt [Na(18-crown-6)(THF)2][H3BNCS] (1), as shown by X-ray crystallography. Both the cation and the anion show site disorder. However, when 15-crown-5 is used for complexation, the salt [Na(15-crown-5)(THF)][H3BNCS] (2) can be isolated. Its anion shows an almost linear B-N-C-S unit. Only a mixture of (catecholato)(isothiocyanato)borates results on treating Na(NCS) in THF with catecholborane. However, the borate Na[catB(NCS)2] is readily formed by adding Na(NCS) to B-(isothiocyanato)catecholborane. Single crystals of this compound were obtained as the salt [Na(18-crown-6)(THF)2][catB(NCS)2] (6). On the other hand, the reaction of Na(NCS) with 9-borabicyclo[3.3.1]nonane (9-BBN) in THF yields Na[(9-BBN)NCS]*nTHF, and, on addition of 18-crown-6, the complex [Na(18-crown-6)(THF)2][(9-BBN)NCS] was isolated. Suitable crystal for X-ray structure determination were, however, only obtained by crystallization from tetrahydropyran. This solvate has the rather unusual structure [Na(18-crown-6)(thp)2][{(9-BBN)NC}2Na(thp)4] (8). The sodiate anion has an Na atom coordinated by two S and four O atoms. DFT calculations support these experimental results: The (isothiocyanato)borates are more stable than the thiocyanato isomers. For the latter a bent structure of the B-S-C-N unit with a B-S-C bond angle of 105.7 deg is predicted.

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Electric Literature of 33100-27-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5

A cesium-133 nuclear magnetic resonance study of the cesium cation complexation by macrocyclic polyethers in hydrophobic RITLs

Thermodynamic data for cesium complexes formation with 18-crown-6 (18C6, L) in five hydrophobic room temperature ionic liquids (RTIL): trioctylmethylammonium salicylate ([TOMA][Sal]), tetrahexylammonium dihexylsulfosuccinate ([THA][DHSS]), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]), 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM][N(Tf)2]), 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([HMIM][N(Tf)2]) as well as with 12-crown-4 (12C4, L) and 15-crown-5 (15C5, L) in [BMIM][N(Tf)2] are measured with NMR 133Cs technique at 27-50 C. Only [Cs(18C6)]+ complexes are found for [TOMA][Sal], [THA][DHSS], [BMIM][PF6], while in [BMIM][N(Tf) 2] and [HMIM][N(Tf)2] both [Cs(18C6)]+ and [Cs(18C6)2]+ species are formed. For 12C4 and 15C5 only [CsL]+ species are registered in [BMIM][N(Tf)2]. For [BMIM][N(Tf)2] the log K1 values are steadily increasing: 12C4 < 15C5 < 18C6. A comparative study of [Cs(18C6)]+ stability in RTILs is estimated to be in the range between water and acetonitrile with constants increasing in the order [THA][DHSS] < [TOMA][Sal] < [BMIM][PF6] < [BMIM][N(Tf)2] < [HMIM][N(Tf)2]. It is demonstrated that unlike hydrophilic RTIL the entropy change with an exception of [BMIM][PF6], promotes complex formation while the corresponding enthalpy change is either positive or gives rather small contribution to the complex stability. 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 33100-27-5 is helpful to your research., Electric Literature of 33100-27-5

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Synthetic Route of 33100-27-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5

Oxa-thia-, oxa-selena and crown ether macrocyclic complexes of tin(ii) tetrafluoroborate and hexafluorophosphate-synthesis, properties and structures

The reactions of Sn(BF4)2 and Sn(PF6) 2 with crown ethers and oxa-thia- or oxa-selena-macrocycles are complex, with examples of fragmentation of the fluoroanions, and cleavage of the ligands observed, in addition to adduct formation. The reaction of Sn(BF 4)2 with 15-crown-5 or 18-crown-6 produced the sandwich complex [Sn(15-crown-5)2][BF4]2 with 10-coordinate tin, and [Sn(18-crown-6)(H2O)][BF4] 2¡¤2H2O which has an hexagonal pyramidal tin centre with two long contacts to lattice water molecules (overall 7 + 2 coordination). [Sn(18-crown-6)(PF6)][PF6] is formed from 18-crown-6 and Sn(PF6)2, but the hexafluorophosphate ions hydrolyse readily in these systems to produce F- which coordinates to the tin to produce [Sn(18-crown-6)F][PF6], which can also be made directly from Sn(PF6)2, 18-crown-6 and KF in MeCN. The structure contains a hexagonal pyramidal coordinated Sn(ii) cation with an apical fluoride. The oxa-thia macrocycle [18]aneO4S2 forms [Sn([18]aneO4S2)(H2O)2(PF 6)][PF6], from which some crystals of composition [Sn([18]aneO4S2)(H2O)2(PF 6)]2[PF6][F] were obtained. The cation contains an approximately planar O4S2 coordinated macrocycle, with two coordinated water molecules on one side of the plane and a weakly bound (kappa2) PF6- group on the opposite face, and with the fluoride ion hydrogen bonded to the coordinated water molecules. In contrast, the oxa-selena macrocycle, [18]aneO4Se2, produces an anhydrous complex [Sn([18]aneO4Se2)(PF 6)2] which probably contains coordinated anions, although it decomposes quite rapidly in solution, depositing elemental Se, and hence crystals for an X-ray study were not obtained. Reacting Sn(BF4) 2 and [18]aneO4Se2 or [18]aneO 4S2 also causes rapid decomposition, but from the latter reaction crystals of the 1,2-ethanediol complex [Sn([18]aneO4S 2){C2H4(OH)2}][BF4] 2 were isolated. The structure reveals the coordinated macrocycle and a chelating diol, with the O-H protons of the latter hydrogen bonded to the [BF4]- anions. This is a very rare, structurally authenticated example of ring opening/cleavage of an oxa-thia macrocycle. The new complexes were characterised by microanalysis, IR, 1H, 19F{1H} and 31P{1H} NMR spectroscopy as appropriate, and X-ray structures are reported for [Sn(15-crown-5) 2][BF4]3[H3O]¡¤H2O, [Sn(18-crown-6)(H2O)][BF4]2¡¤2H 2O, [Sn(18-crown-6)F][PF6], [Sn([18]aneO4S 2)(H2O)2(PF6)]2[PF 6][F] and [Sn([18]aneO4S2){C2H 4(OH)2}][BF4]2. The complexes are compared and contrasted with chloro-tin(ii) complexes of crown ethers, germanium(ii) and lead(ii) analogues.

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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

Phase Transition Enthalpy Measurements of Organic and Organometallic Compounds. Sublimation, Vaporization and Fusion Enthalpies From 1880 to 2015. Part 1. C1-C10

A compendium of phase change enthalpies published in 2010 is updated to include the period 1880-2015. Phase change enthalpies including fusion, vaporization, and sublimation enthalpies are included for organic, organometallic, and a few inorganic compounds. Part 1 of this compendium includes organic compounds from C1-C10. Part 2 of this compendium, to be published separately, will include organic and organometallic compounds from C11 to C192. Sufficient data are presently available to permit thermodynamic cycles to be constructed as an independent means of evaluating the reliability of the data. Temperature adjustments of phase change enthalpies from the temperature of measurement to the standard reference temperature, T = 298.15 K, and a protocol for doing so are briefly discussed.

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