Encapsulation of the uranyl dication

Beer, Stephan; Berryman, Orion B.; Ajami, Dariush; Rebek, Julius

doi:10.1039/c0sc00116c

Cited by 39 publications

(20 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the model dimer, in most cases, showed more intense CDs in the absence and presence of achiral and chiral amines than the polymer, it lacks a cooperativity, and chiral amplification cannot be anticipated. It has been well‐established that carboxylic acids are useful components for constructing well‐defined supramolecular two‐ and three‐dimensional architectures assisted by metal coordination, which may provide an alternative way to produce novel homo‐double and ‐triple helices with a controlled helix‐sense . This study is now ongoing in our laboratory.…”

Section: Discussionmentioning

confidence: 94%

“…It has been well-established that carboxylic acids are useful components for constructing well-defined supramolecular two-and three-dimensional architectures assisted by metal coordination, which may provide an alternative way to produce novel homo-double and -triple helices with a controlled helixsense. 33,34 This study is now ongoing in our laboratory.…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Homo‐double helix formation of an optically active conjugated polymer bearing carboxy groups and amplification of the helicity upon complexation with achiral and chiral amines

Makiguchi

Kobayashi

Iida

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

An optically active, m-terphenyl-based p-conjugated polymer bearing carboxy groups was synthesized by the copolymerization of the diethynyl monomer bearing a carboxy group with (S,S)-2,5-bis(2-methylbutoxy)-1,4-dibromobenzene using Sonogashira reaction. The copolymer showed a weak circular dichroism (CD) in the main-chain chromophore region due to a homo-double helix formation with an excess helical handedness biased by the chiral alkoxy substituents through self-association. However, upon complexation with achiral amines, such as piperidine, the CD intensity of the polymer significantly increased resulting in the formation of a greater excess one-handed homo-double helix via hydrogen-bonded inclusion complexation with the achiral amines between each strand, leading to the amplification of the helicity. A preferredhanded homo-double helix was also induced in the polymer in the presence of nonracemic amines. The effect of the achiral and chiral amines on the homo-double helix formation was investigated by comparing the CD spectra of the polymer to those of its model dimer. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 990-999

show abstract

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 97%

Homo‐double helix formation of an optically active conjugated polymer bearing carboxy groups and amplification of the helicity upon complexation with achiral and chiral amines

Makiguchi

Kobayashi

Iida

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

show abstract

“…[1][2][3] Thus it is valuable to recover uranium from the seawater. To recover uranium from the seawater, many methods including solvent extraction [4][5][6][7] ion exchange, [8] flotation, [9] biomass collection and adsorption [10][11][12][13][14] have been developed. Among these methods, the adsorption of uranium on polymeric chelating adsorbents had attracted wide attention.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Uranium Adsorption Properties of Amidoxime-Based Adsorbent Through Cografting of Amine Group

Ting¹,

Xiong²,

Wei³

et al. 2013

Journal of Dispersion Science and Technology

View full text Add to dashboard Cite

Amidoxime (AO)/amine co-functionalized polypropylene fiber adsorbents were prepared. The all-polymeric structures were characterized by using Fourier transform infrared spectroscopy (FTIR), optical microscope, contact angle meter and electron spin resonance (ESR) analysis methods, confirming the grafting, modification, and amidoximation stages gravimetrically, spectroscopically, and visually. The properties for the removal of uranyl(VI) from aqueous solutions were investigated. For amidoxime (AO) fiber, high adsorption rate was observed within the first 30 minutes and the plateau value of 40.6% uranium loading (0.0812 mg/g) was reached at around 30 minutes. The adsorption equilibrium for AO/amine fiber was attained within 20 minutes, resulting in the adsorption of 92.6% uranium loading (0.185 mg/g). The percentage of adsorption increases with increasing pH value (2-6), reaches a maximum at pH 6.0 and then remains almost constant for AO/amine fiber, whereas reduces slightly for AO fiber.

show abstract

“…[1][2][3] Many types of adsorbents have been developed and tested for the recovery of uranium from seawater and aqueous media. To recover uranium from seawater at the price competitive with those from conventional uranium resources, many methods such as solvent extraction [4][5][6][7] ion exchange [8], flotation [9], biomass collection and adsorption [10][11][12][13][14] have been developed. The studies indicate that poly(acrylamidoximes) are the most promising candidate adsorbents for the recovery of uranium from seawater.…”

Section: Introductionmentioning

confidence: 99%

High performance of amidoxime/amine functionalized polypropylene for uranyl (VI) from aqueous solution

Chi

Xiong

et al. 2013

E-Polymers

View full text Add to dashboard Cite

Amidoxime-based adsorbents are widely investigated as the main adsorbent in the recovery of uranium from seawater. However, the adsorption rate and loading capacity of such adsorbents should be further improved due to the economic viability consideration. In this paper, the adsorption properties of amidoxime-based adsorbent were enhanced through the cografting of amino groups. The acrylonitrile (AN) and glycidyl methacrylate (GMA) were firstly cografted onto polypropylene fibers by preirradiation grafting technique. Then the cografted fibers were treated with ethylenediamine to convert GMA to amino group, following treated with hydroxylamine to convert AN groups to amidoxime (AO) group. Fourier transform infrared spectroscopy, scanning electron microscopy and contact angle measurement were used to characterize the structure of the adsorbent. The results showed that the amidoxime and amino groups had been successfully grafted onto the polypropylene fibers. For AO fiber, high adsorption rate was observed within the first 30 min and the plateau value of 42.3% uranium loading (0.0904mg/g) was reached at around 30 min. The AO/amine fibers exhibited a higher adsorption rate. The adsorption equilibrium for AO/amine fiber was attained within 20 min, resulting in the adsorption of 93.3% uranium loading (0.191mg/g). Additionally, AO/amine fibers can avoid pH reducing for better adsorption efficiency.

show abstract

Encapsulation of the uranyl dication

Cited by 39 publications

References 49 publications

Homo‐double helix formation of an optically active conjugated polymer bearing carboxy groups and amplification of the helicity upon complexation with achiral and chiral amines

Homo‐double helix formation of an optically active conjugated polymer bearing carboxy groups and amplification of the helicity upon complexation with achiral and chiral amines

Improvement in Uranium Adsorption Properties of Amidoxime-Based Adsorbent Through Cografting of Amine Group

High performance of amidoxime/amine functionalized polypropylene for uranyl (VI) from aqueous solution

Contact Info

Product

Resources

About