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Using temperature\u2010induced excited spin\u2010state trapping (TIESST), the low\u2010temperature electronic structure of the\n                    <jats:italic>HS<\/jats:italic>\n                    state is accessed despite a diamagnetic low\u2010spin (\n                    <jats:italic>LS<\/jats:italic>\n                    ) ground state. Field\u2010dependent spectra resolve the splitting of the\n                    <jats:italic>HS<\/jats:italic>\n                    ground\u2010state manifold and provide evidence for spin\u2013phonon coupling, described by an avoided\u2010crossings Hamiltonian supported by ab initio calculations. THz\u2010EPR further quantifies the remaining\n                    <jats:italic>HS<\/jats:italic>\n                    fraction () and reveals shifts of magnetic transitions that depend on the surrounding spin\u2010state matrix. These results show that\n                    <jats:italic>HS<\/jats:italic>\n                    centers experience distinct local lattice environments in mixed\n                    <jats:italic>HS<\/jats:italic>\n                    \/\n                    <jats:italic>LS<\/jats:italic>\n                    states and provide experimental access to the influence of spin\u2010state distribution on SCO processes. Cooperative switching scenarios, including domain formation and alternating\n                    <jats:italic>HS<\/jats:italic>\n                    \/\n                    <jats:italic>LS<\/jats:italic>\n                    arrangements, can thus be distinguished. Field\u2010dependent THz\u2010EPR spectroscopy therefore provides direct access to lattice\u2010dependent effects in SCO\u00a0materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.4674308","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T10:36:05Z","timestamp":1788345365000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Part and the Whole: Field\u2010Dependent THz\u2010EPR Spectroscopy Probes Lattice\u2010Dependent Electronic Structure in Iron(II) Spin Crossover"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-3520-3367","authenticated-orcid":false,"given":"Jooris","family":"Beyer","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Anorganische und Analytische Chemie Friedrich\u2010Schiller\u2010Universit\u00e4t Jena Jena 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