Evidence map›Paper›PMID 34976339›Full record

ArticleChemical science2021

The electrostatic origins of specific ion effects: quantifying the Hofmeister series for anions.

Kasimir P Gregory, Erica J Wanless, Grant B Webber, Vincent S J Craig, Alister J Page

Abstract read
In one paragraph

Article in Chemical science, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

31 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Hydrophilicity controls thermodiffusion in alkylammonium chlorides.The European physical journal. E, Soft matter · 2026
    Article
  5. Article
  6. Article
  7. Article
  8. Counterion-Mediated Luminophore Dimerization.Angewandte Chemie (International ed. in English) · 2025
    Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Specific Ion Effects in Hydrogels.Molecules (Basel, Switzerland) · 2024
    Review
  16. Article
  17. Review
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Kasimir P GregoryDiscipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle Callaghan New South Wales 2308 Australia alister.page@newcastle.edu.au.ORCID https://orcid.org/0000-0002-8055-370X
Erica J WanlessDiscipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle Callaghan New South Wales 2308 Australia alister.page@newcastle.edu.au.ORCID https://orcid.org/0000-0003-0869-4396
Grant B WebberSchool of Engineering, The University of Newcastle Callaghan New South Wales 2308 Australia.ORCID https://orcid.org/0000-0001-8303-6081
Vincent S J CraigDepartment of Applied Mathematics, Research School of Physics, Australian National University Canberra ACT 0200 Australia.ORCID https://orcid.org/0000-0002-8048-8397
Alister J PageDiscipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle Callaghan New South Wales 2308 Australia alister.page@newcastle.edu.au.ORCID https://orcid.org/0000-0002-8444-2775

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Life as we know it is dependent upon water, or more specifically salty water. Without dissolved ions, the interactions between biological molecules are insufficiently complex to support life. This complexity is intimately tied to the variation in properties induced by the presence of different ions. These specific ion effects, widely known as Hofmeister effects, have been known for more than 100 years. They are ubiquitous throughout the chemical, biological and physical sciences. The origin of these effects and their relative strengths is still hotly debated. Here we reconsider the origins of specific ion effects through the lens of Coulomb interactions and establish a foundation for anion effects in aqueous and non-aqueous environments. We show that, for anions, the Hofmeister series can be explained and quantified by consideration of site-specific electrostatic interactions. This can simply be approximated by the radial charge density of the anion, which we have calculated for commonly reported ions. This broadly quantifies previously unpredictable specific ion effects, including those known to influence solution properties, virus activities and reaction rates. Furthermore, in non-aqueous solvents, the relative magnitude of the anion series is dependent on the Lewis acidity of the solvent, as measured by the Gutmann Acceptor Number. Analogous SIEs for cations bear limited correlation with their radial charge density, highlighting a fundamental asymmetry in the origins of specific ion effects for anions and cations, due to competing non-Coulombic phenomena.

Identifiers

PMID34976339
PMCPMC8612401

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.