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The inclusion of iron-based species, in particular, can further boost the functionality of the material, owing to iron\u2019s ability to adopt multiple oxidation states and form both high-spin and low-spin complexes. Motivated by this, a series of hybrid inorganic-organic dodecylpyridinium metallosurfactants with iron-containing counterions was developed. It was established that using either divalent or trivalent iron halides in a straightforward synthetic procedure yields C12Py-metallosurfactants with distinct complex counterions: (C12Py)2[Fe2X6O] and (C12Py)[FeX4] (X = Cl or Br), respectively. A combination of techniques\u2014including conductometry, dynamic and electrophoretic light scattering, single-crystal and thermogravimetric analysis, and magnetic measurements\u2014provided in-depth insights into their solution and solid-state properties. The presence of different iron-based counterions significantly influences the crystal structure (interdigitated vs. non-interdigitated bilayers), magnetic properties (paramagnetic vs. nonmagnetic singlet ground state), and self-assembly (vesicles vs. micelles) of the dodecylpyridinium series. To our knowledge, this is the first report on the synthesis and characterization of hybrid organic-inorganic metallosurfactants containing the \u03bc-oxo-hexahalo-diferrate anion.<\/jats:p>","DOI":"10.3390\/ijms26062540","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T07:31:42Z","timestamp":1741764702000},"page":"2540","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Tuning the Properties of Dodecylpyridinium Metallosurfactants: The Role of Iron-Based Counterions"],"prefix":"10.3390","volume":"26","author":[{"given":"Mirta","family":"Rub\u010di\u0107","sequence":"first","affiliation":[{"name":"Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mirta","family":"Herak","sequence":"additional","affiliation":[{"name":"Department for Research of Materials Under Extreme Conditions, Institute of Physics, Bijeni\u010dka Cesta 46, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana","family":"Ivan\u010di\u0107","sequence":"additional","affiliation":[{"name":"Division of Physical Chemistry, Ru\u0111er Bo\u0161kovi\u0107 Institute, Bijeni\u010dka 54, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7184-7757","authenticated-orcid":false,"given":"Edi","family":"Topi\u0107","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emma","family":"Beri\u0161a","sequence":"additional","affiliation":[{"name":"Faculty of Chemical Engineering and Technology, University of Zagreb, Trg Marka Maruli\u0107a 19, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1396-164X","authenticated-orcid":false,"given":"Ivana Tartaro","family":"Bujak","sequence":"additional","affiliation":[{"name":"Division of Materials Chemistry, Ru\u0111er Bo\u0161kovi\u0107 Institute, Bijeni\u010dka 54, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5261-5961","authenticated-orcid":false,"given":"Darija","family":"Domazet Jura\u0161in","sequence":"additional","affiliation":[{"name":"Division of Physical Chemistry, Ru\u0111er Bo\u0161kovi\u0107 Institute, Bijeni\u010dka 54, HR-10000 Zagreb, Croatia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Mehta, S., and Kaur, R. 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