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Title: Anion Binding in Solution: Beyond the Electrostatic Regime

Journal Article · · Chem

A fundamental understanding of anion binding by receptors is essential for managing salts during energy, water, and food production. However, the limited understanding of solvent effects in ion recognition leads to a persistent blind spot that prevents effective receptor design. Here we experimentally discovered an underlying 1/εr dependence of anion affinity on solvent dielectric constant (εr). We found this relationship by measuring how chloride binds to macrocyclic triazolophane receptors across a wide range of solvents: εr = 4.7–56.2. Solvent weakens affinity by screening electrostatics; electrostatics dominates when εr < 4.7 (chloroform) and then transits a cross-over region (4.7 < εr < 20.5; acetone), after which it no longer governs affinity (acetonitrile and DMSO). Density functional theory helped us understand this dependence. Our theory-backed model accurately predicts Cl affinity in solvents used in liquid-liquid extractions in the nuclear fuel cycle. This model offers a general foundation for anion recognition and electrostatically driven complexation.

Research Organization:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Lilly Endowment Inc
Grant/Contract Number:
FG02-09ER16068; SC0002728; 2008 1639-000; 2004 2058-0000
OSTI ID:
1470777
Alternate ID(s):
OSTI ID: 1533636
Journal Information:
Chem, Journal Name: Chem Vol. 3 Journal Issue: 3; ISSN 2451-9294
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 104 works
Citation information provided by
Web of Science

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