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A Cationic Silver Pyrazine Coordination Polymer With High Capacity Anion Uptake From Water

A Cationic Silver Pyrazine Coordination Polymer With High Capacity Anion Uptake From Water

Eaindar Soe, Beatriz Ehlke, Scott R J Oliver

Environ Sci Technol. 2019 Jul 2;53(13):7663-7672.

PMID: 31174421

Abstract:

We report the first example of linker modification for an N-donor Ag-based cationic material while maintaining and in some cases increasing the anion exchange capacity. Cationic silver(I) pyrazine nitrate selectively traps harmful oxo-anions from water such as permanganate, perrhenate and a variety of α,ω-alkanedicarboxylates. We chose these anions as initial examples of exchange for potential water purification. The host-guest interaction between the cationic layers of π-stacked silver pyrazine polymers and the incoming/outgoing interlamellar anions allows for the exchange. The exchange capacity over 24 h reached 435 and 818 mg/g for permanganate and perrhenate, respectively, a record for a crystalline metal-organic material and over five times the exchange capacity compared to commercial resin. The material also undergoes organic exchange as an analog for pharmaceutical waste, some of which have a carboxylate functionality at the neutral pH range typical of natural water sources. Both the as-synthesized and exchanged materials are characterized by a variety of analytical techniques.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP20654562	Silver(I) perrhenate		20654-56-2	Price

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