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Updated: May 21, 2026

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
Selective total encapsulation of the sulfate anion by neutral nano-jars
Isurika R Fernando1, Stuart A Surmann, Alexander A Urech
1Department of Chemistry, Western Michigan University, Kalamazoo, MI 49008, USA.
Abstract:
Nano-sized toroidal copper(II)-hydroxide/pyrazolate assemblies, lined by H-bond donors on the inside and hydrophobic on the outside, selectively extract sulfate from mixtures with nitrate or perchlorate. Tetrabutylammonium "lids" seal the "nano-jars" and render the encapsulated sulfate anion completely buried and inaccessible, so that it is not precipitated by Ba(2+) ions.
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