Binding of uranyl ion by 2,2′‐dihydroxyazobenzene attached to crosslinked polystyrenes covered with highly populated quaternary ammonium cations

Lee, Kwanpyo; Jang, Bo‐Bin; Kwon, Won Jong; Suh, Junghun

doi:10.1002/(sici)1099-0518(19991115)37:22<4117::aid-pola10>3.3.co;2-2

Cited by 12 publications

(6 citation statements)

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“…152 In the former references, the chloromethyl group could also be converted to a quaternary ammonium function by treating with various tertiary amines. 36,37 In this work, spectrophotometric titration experiments revealed 1:1 complexes of various metals, including uranium, with PEI-bound DHAB (Figure 31). 38 After grafting to the Sephadex resin with cyanuric chloride as a coupling reagent, the adsorbent was investigated for recovery of metals from seawater.…”

Section: Chemical Reviewsmentioning

confidence: 54%

“…Suh and colleagues functionalized Sephadex G-25 resin with a metal-binding ligand composed of 2,2′-dihydroxyazobenzene (DHAB) attached to poly-(ethylenimine) (PEI; Figure 30). 38 This work followed previous studies by the same group where DHAB was attached to a chloromethylated cross-linked poly(St) support, 36 chloromethylated poly(St-co-DVB), 37 and pure PEI. 152 In the former references, the chloromethyl group could also be converted to a quaternary ammonium function by treating with various tertiary amines.…”

Section: Chemical Reviewsmentioning

confidence: 95%

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Materials for the Recovery of Uranium from Seawater

et al. 2017

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More than 1000× uranium exists in the oceans than exists in terrestrial ores. With nuclear power generation expected to increase over the coming decades, access to this unconventional reserve is a matter of energy security. With origins in the mid-1950s, materials have been developed for the selective recovery of seawater uranium for more than six decades, with a renewed interest in particular since 2010. This review comprehensively surveys materials developed from 2000-2016 for recovery of seawater uranium, in particular including recent developments in inorganic materials; polymer adsorbents and related research pertaining to amidoxime; and nanostructured materials such as metal-organic frameworks, porous-organic polymers, and mesoporous carbons. Challenges of performing reliable and reproducible uranium adsorption studies are also discussed, as well as the standardization of parameters necessary to ensure valid comparisons between different adsorbents.

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Section: Chemical Reviewsmentioning

confidence: 54%

Section: Chemical Reviewsmentioning

confidence: 95%

Materials for the Recovery of Uranium from Seawater

et al. 2017

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“…The formation constant ( K f ) for the Cu(II) complex in ([Cu(II)]BAMP)-PCPS MeO or CABP was measured by assuming 11 that binding of Cu(II) to a binding ligand is independent of succeeding bindings by analogy with the Langmuir isotherm. By the use of the method described previously, , ethylenediaminetetraacetate (EDTA) was used as the competing chelating reagent that extracts Cu(II) ion from the Cu(II)-binding sites built on the resin. The equilibrium constant ( K ex ) for the Cu(II)-exchange reaction was estimated from nonlinear regression of the data for formation of Cu(II)EDTA by equilibration between EDTA and ([Cu(II)]BAMP)-PCPS MeO or CABP (see the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Artificial Peptidase with an Active Site Comprising a Cu(II) Center and a Proximal Guanidinium Ion. A Carboxypeptidase A Analogue

Suh

Moon

2001

Inorg. Chem.

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An immobile artificial metallopeptidase having a well-defined active site was constructed on the backbone of cross-linked polystyrene by adjoining a guanidinium moiety to the Cu(II) complex of a tetraaza ligand. The catalyst (CABP) and intermediate polymers were characterized by elemental analysis, IR, inductively coupled plasma measurement, electron probe microanalysis, test for primary amines, binding of Cu(II) ion, and complexation of p-nitrobenzoate ion. CABP effectively catalyzed amide hydrolysis of carboxyl-containing N-acyl amino acids. The catalytic rate of CABP in the hydrolysis of unactivated amides was comparable to that of the catalytic antibody with the highest peptidase activity reported to date. It is proposed that the guanidinium moiety of CABP recognizes the carboxylate anion of the substrate whereas the Cu(II) center participates in the cleavage of the amide bond of the complexed substrate. Several characteristic features of carboxypeptidase A were reproduced by CABP: catalytic action of the metal ion, participation of guanidinium in substrate recognition, hydrolysis of small unactivated amides, and substrate selectivity toward amide bonds adjacent to a carboxylate group.

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“…The formation constant ( K f ) for Cu(II)tren moieties linked to PCD can be measured by assuming that binding of Cu(II) to a tren unit is independent of succeeding bindings by analogy with the Langmuir isotherm . By using the method described previously, , log K f was measured by a competition experiment using ethylenediaminetetraacetate (EDTA) as the chelating reagent of Cu(II) ion. Data for formation of Cu(II)EDTA by equilibration between EDTA and [(Cu(II)tren) 1.97 ] 0.74 PCD MeO are illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Artificial Trinuclear Metallopeptidase Synthesized by Cross-Linkage of a Molecular Bowl with a Polystyrene Derivative

et al. 2000

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A novel methodology is reported for construction of active sites of artificial multinuclear metalloenzymes: transfer of metal-chelating sites confined in a prebuilt cage to a polymeric backbone. Artificial active sites comprising two or three moieties of Cu(II) complex of tris(2-aminoethyl)amine (tren) were prepared by transfer of Cu(II)tren units confined in a molecular bowl (MB) to poly(chloromethylstyrene-co-divinylbenzene) (PCD). By treatment of unreacted chloro groups of the resulting PCD with methoxide and destruction of the MB moieties attached to PCD with acid followed by addition of Cu(II) ion to the exposed tren moieties, catalytic polymers with peptidase activity were obtained. The average number (β) of proximal Cu(II)tren moieties in the active site of the artificial multinuclear metallopeptidase was determined by quantifying the Cu(II) content. Several species of the artificial metallopeptidases with different β contents were prepared and examined for catalytic activity in hydrolysis of various cinnamoyl amide derivatives. The PCD-based catalytic polymers did not hydrolyze a neutral amide but effectively hydrolyzed carboxyl-containing amides (N-cinnamoyl glycine, N-cinnamoyl β-alanine, and N-cinnamoyl γ-amino butyrate). Analysis of the kinetic data revealed that the active sites comprising three Cu(II)tren units were mainly responsible for the catalytic activity. When analyzed in terms of k cat, the catalytic activity of the PCD-based artificial peptidase was comparable to or better than the catalytic antibody with the highest peptidase activity reported to date. A mechanism is suggested for the effective cooperation among the three metal centers of the active site in hydrolysis of the carboxyl-containing amides.

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Binding of uranyl ion by 2,2′‐dihydroxyazobenzene attached to crosslinked polystyrenes covered with highly populated quaternary ammonium cations

Cited by 12 publications

References 0 publications

Materials for the Recovery of Uranium from Seawater

Materials for the Recovery of Uranium from Seawater

Artificial Peptidase with an Active Site Comprising a Cu(II) Center and a Proximal Guanidinium Ion. A Carboxypeptidase A Analogue

Artificial Trinuclear Metallopeptidase Synthesized by Cross-Linkage of a Molecular Bowl with a Polystyrene Derivative

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