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1. Electroactive Anion Receptor with High Affinity for Arsenate

   https://doi.org/10.1021/acs.joc.0c01206  

   Etkind, Samuel I.; Vander Griend, Douglas A.; Swager, Timothy M. (August 2020, The Journal of Organic Chemistry)

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2. Triel bonds within anion ··· anion complexes

   https://doi.org/10.1039/D1CP04296C  

   Michalczyk, Mariusz; Zierkiewicz, Wiktor; Wysokiński, Rafał; Scheiner, Steve (November 2021, Physical Chemistry Chemical Physics)

   The ability of two anions to interact with one another is tested in the context of pairs of TrX 4 − homodimers, where Tr represents any of the triel atoms B, Al, Ga, In, or Tl, and X refers to a halogen substituent F, Cl, or Br. None of these pairs engage in a stable complex in the gas phase, but the situation reverses in water where the two monomers are held together by Tr⋯X triel bonds, complemented by stabilizing interactions between X atoms. Some of these bonds are quite strong, notably those involving TrF 4 − , with interaction energies surpassing 30 kcal mol −1 . Others are very much weaker, with scarcely exothermic binding energies. The highly repulsive electrostatic interactions are counteracted by large polarization energies. 

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3. Stabilization and Extraction of Fluoride Anion Using a Tetralactam Receptor

   https://doi.org/10.1021/acs.joc.9b00042  

   Liu, Wenqi; Oliver, Allen G.; Smith, Bradley D. (January 2019, The Journal of Organic Chemistry)
4. ChemFET Anion Sensor Based on MOF Nanoparticles

   https://doi.org/10.1002/cplu.202400622  

   Banning, Douglas H; Davenport, Audrey M; Lakanen, Natalie M; Huang, Jiawei; Brozek, Carl K; Johnson, Darren W (January 2025, ChemPlusChem)

   Abstract Nanoparticles of metal‐organic frameworks (nanoMOFs) possess the unusual combination of both internal and external surfaces. While internal surfaces have been the focus of fundamental and applications‐based MOF studies, the chemistry of the external surfaces remains scarcely understood. Herein we report that specific ion interactions with nanoparticles of Cu(1,2,3‐triazolate)₂(Cu(TA)₂) resemble the Hofmeister behavior of proteins and the supramolecular chemistry of synthetic macromolecules. Inspired by these anion‐selective interactions, we tested the performance of Cu(TA)₂nanoparticles as chemical field effect transistor (ChemFET) anion sensors. Rather than size‐based selectivity, the detection limits of the devices exhibit a Hofmeister trend, with the greatest sensitivity towards anions perchlorate, iodide, and nitrate. These results highlight the importance of the pore‐based supramolecular interactions, rather than localized donor‐acceptor pairs, in designing MOF‐based technologies. 

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5. Disrupting the Hofmeister bias in salt liquid–liquid extraction with an arylethynyl bisurea anion receptor

   https://doi.org/10.1039/d3sc05922g  

   Fargher, Hazel A; Delmau, Lætitia H; Bryantsev, Vyacheslav S; Haley, Michael M; Johnson, Darren W; Moyer, Bruce A (April 2024, Chemical Science)

   Host-mediated liquid–liquid extraction is a convenient method for the separation of inorganic salts. 

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