Self-Assembly of an Anion-Binding Cryptand for the Selective Encapsulation, Sequestration, and Precipitation of Phosphate from Aqueous Systems

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Abstract

The self-assembled trimetallic species [L2Cu3]6+ contains a cavity that acts as a host to many different anions. By using X-ray crystallography, ESI-MS, and UV/Vis spectroscopy we show that these anions are encapsulated both in the solid state and aqueous systems. Upon encapsulation, the anions Br, I, CO3 2−, SiF6 2−, IO6 3−, VO4 3−, WO4 2−, CrO4 2−, SO4 2−, AsO4 3−, and PO4 3− are all precipitated from aqueous solution and can be removed by filtration. Furthermore, the cavity can be tuned to be selective to either phosphate or sulfate anions by variation of the pH. Phosphate anions can be removed from water, even in the presence of other common anions, reducing the concentration from 1000 to <0.1 ppm and recovering approximately 99 % of the phosphate anions.

LanguageEnglish
Pages13071-13075
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number40
Early online date16 Aug 2018
DOIs
Publication statusPublished - 1 Oct 2018

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Encapsulation
Self assembly
Anions
Phosphates
Negative ions
X ray crystallography
cryptand
Ultraviolet spectroscopy
Sulfates
Water

Cite this

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title = "Self-Assembly of an Anion-Binding Cryptand for the Selective Encapsulation, Sequestration, and Precipitation of Phosphate from Aqueous Systems",
abstract = "The self-assembled trimetallic species [L2Cu3]6+ contains a cavity that acts as a host to many different anions. By using X-ray crystallography, ESI-MS, and UV/Vis spectroscopy we show that these anions are encapsulated both in the solid state and aqueous systems. Upon encapsulation, the anions Br−, I−, CO3 2−, SiF6 2−, IO6 3−, VO4 3−, WO4 2−, CrO4 2−, SO4 2−, AsO4 3−, and PO4 3− are all precipitated from aqueous solution and can be removed by filtration. Furthermore, the cavity can be tuned to be selective to either phosphate or sulfate anions by variation of the pH. Phosphate anions can be removed from water, even in the presence of other common anions, reducing the concentration from 1000 to <0.1 ppm and recovering approximately 99 {\%} of the phosphate anions.",
keywords = "anions, copper, host–guest systems, ligands, supramolecular chemistry",
author = "Rice, {Craig R.} and Christopher Slater and Faulkner, {Robert A.} and Allan, {Robert L.}",
year = "2018",
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language = "English",
volume = "57",
pages = "13071--13075",
journal = "Angewandte Chemie - International Edition",
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publisher = "John Wiley and Sons Ltd",
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TY - JOUR

T1 - Self-Assembly of an Anion-Binding Cryptand for the Selective Encapsulation, Sequestration, and Precipitation of Phosphate from Aqueous Systems

AU - Rice, Craig R.

AU - Slater, Christopher

AU - Faulkner, Robert A.

AU - Allan, Robert L.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - The self-assembled trimetallic species [L2Cu3]6+ contains a cavity that acts as a host to many different anions. By using X-ray crystallography, ESI-MS, and UV/Vis spectroscopy we show that these anions are encapsulated both in the solid state and aqueous systems. Upon encapsulation, the anions Br−, I−, CO3 2−, SiF6 2−, IO6 3−, VO4 3−, WO4 2−, CrO4 2−, SO4 2−, AsO4 3−, and PO4 3− are all precipitated from aqueous solution and can be removed by filtration. Furthermore, the cavity can be tuned to be selective to either phosphate or sulfate anions by variation of the pH. Phosphate anions can be removed from water, even in the presence of other common anions, reducing the concentration from 1000 to <0.1 ppm and recovering approximately 99 % of the phosphate anions.

AB - The self-assembled trimetallic species [L2Cu3]6+ contains a cavity that acts as a host to many different anions. By using X-ray crystallography, ESI-MS, and UV/Vis spectroscopy we show that these anions are encapsulated both in the solid state and aqueous systems. Upon encapsulation, the anions Br−, I−, CO3 2−, SiF6 2−, IO6 3−, VO4 3−, WO4 2−, CrO4 2−, SO4 2−, AsO4 3−, and PO4 3− are all precipitated from aqueous solution and can be removed by filtration. Furthermore, the cavity can be tuned to be selective to either phosphate or sulfate anions by variation of the pH. Phosphate anions can be removed from water, even in the presence of other common anions, reducing the concentration from 1000 to <0.1 ppm and recovering approximately 99 % of the phosphate anions.

KW - anions

KW - copper

KW - host–guest systems

KW - ligands

KW - supramolecular chemistry

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U2 - 10.1002/anie.201805633

DO - 10.1002/anie.201805633

M3 - Article

VL - 57

SP - 13071

EP - 13075

JO - Angewandte Chemie - International Edition

T2 - Angewandte Chemie - International Edition

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SN - 1433-7851

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ER -