{
  "abstract": "Three new zero-field Co(II) single ion magnets (SIMs) [Co(L¹)₂]•1.3MeOH (1), [Co(L²)₂]•0.33MeOH (2), and [Co(L³) 2 ] (3) and one Zn(II) analogue [Zn(L³)₂](Zn3) were synthesized using azo-derivatized N-sulfonylated amine ligands HL¹, HL² and HL³. All Co(II) complexes possess large axial magnetic anisotropy (Dexp = -61.2, -58.5, and -94.8 cm -1 for 1-3, respectively) with near-zero rhombicity stemming from axially elongated tetrahedral symmetry. Dynamic magnetic measurements revealed slow relaxation of magnetization up to 15 K for 1 and 2, and up to 18 K for 3 under a zero applied DC field, dominated by Raman and quantum tunneling processes. For complex 2, the Orbach process was additionally observed with U eff = 164.0 K (114.0 cm -1 ). Photoisomerisation experiments in solution and PMMA films demonstrated reversible light-induced switching for 1, 2, and Zn3 upon blue/UV irradiation, with no detectable degradation after ten cycles. These findings are further supported by DFT/TD-DFT calculations. Special attention is given to the study of non-covalent interactions in the vicinity of metal centres. To our knowledge, this represents the first report of light-switchable azo-functionalized zero-field Co(II) SIMs.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Petr Halaš"
    },
    {
      "name": "Ivan Nemec"
    },
    {
      "name": "Erik Čižmár"
    },
    {
      "name": "Lucie Routaboul"
    },
    {
      "name": "Laure Vendier"
    },
    {
      "name": "Radovan Herchel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9rtd1dnfcdjjn.bib",
  "cited_by": 0,
  "doi": "10.1039/d6qi01825d",
  "fulltext_url": null,
  "id": "9rtd1dnfcdjjn",
  "issns": [
    "2052-1545",
    "2052-1553"
  ],
  "landing_url": "https://hal.science/hal-05745569v1",
  "language": "en",
  "licence": "CC-BY-NC-4.0",
  "licence_label": "CC BY-NC 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "1.chim.coor"
    ],
    [
      "hal",
      "1.chim.cris"
    ],
    [
      "hal",
      "1.chim.theo"
    ],
    [
      "openalex",
      "2504|Magnetism in coordination complexes"
    ]
  ],
  "openalex": "W7204469592",
  "pdf_url": "https://hal.science/hal-05745569/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": "Royal Society of Chemistry",
  "ris": "https://research.draconitic.com/paper/9rtd1dnfcdjjn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:33Z",
      "native_id": "hal-05745569",
      "source": "hal",
      "url": "https://hal.science/hal-05745569v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:1.chim.coor",
      "subfield": "inorganic"
    },
    {
      "field": "chemistry",
      "origin": "hal:1.chim.theo",
      "subfield": "theoretical"
    }
  ],
  "title": "Photoisomerisable zero-field Co(II) single-ion magnets with azo-functionalized sulfonamide ligands: synthesis, crystal structure, magnetism and light-induced switching",
  "title_text": "Photoisomerisable zero-field Co(II) single-ion magnets with azo-functionalized sulfonamide ligands: synthesis, crystal structure, magnetism and light-induced switching",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:33Z",
  "url": "https://research.draconitic.com/paper/9rtd1dnfcdjjn",
  "venue": "Inorganic Chemistry Frontiers",
  "versions": []
}