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However, independently tuning the SCO and PL properties to achieve synergistic SCO\u2010PL behavior remains challenging. Herein, we present a series of heteroleptic Fe(II) coordination compounds with the general formula [Fe(\n                    <jats:bold>L<\/jats:bold>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    (\n                    <jats:bold>R<\/jats:bold>\n                    CN)\n                    <jats:sub>2<\/jats:sub>\n                    ](ClO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    \u2022n\n                    <jats:bold>R<\/jats:bold>\n                    CN, bearing four BODIPY\u2010derived fluorophores\n                    <jats:bold>L<\/jats:bold>\n                    (\n                    <jats:bold>L\u00a0<\/jats:bold>\n                    =\u00a04,4\u2010difluoro\u20101,3,5,7\u2010tetramethyl\u20108\u2010[(1\n                    <jats:italic>H<\/jats:italic>\n                    \u2010tetrazol\u20101\u2010yl)methyl]\u20104\u2010bora\u20103a,4a\u2010diaza\u2010\n                    <jats:italic>s<\/jats:italic>\n                    \u2010indacene) in the equatorial positions and variable\n                    <jats:bold>R<\/jats:bold>\n                    CN co\u2010ligands (CH\n                    <jats:sub>3<\/jats:sub>\n                    CH\n                    <jats:sub>2<\/jats:sub>\n                    CN, CH\n                    <jats:sub>2<\/jats:sub>\n                    CHCN, CH\n                    <jats:sub>3<\/jats:sub>\n                    (CH\n                    <jats:sub>2<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    CN, PhCN) in the apical positions. The systematic variation of the co\u2010ligand modulates steric and\/or electronic effects, thereby influencing the SCO behavior without perturbing the PL characteristics. Magnetic susceptibility measurements revealed T\n                    <jats:sub>1\/2<\/jats:sub>\n                    =\u00a0220\u00a0K and 270\u00a0K for\n                    <jats:bold>R\u00a0<\/jats:bold>\n                    =\u00a0CH\n                    <jats:sub>3<\/jats:sub>\n                    CH\n                    <jats:sub>2<\/jats:sub>\n                    and\n                    <jats:bold>R\u00a0<\/jats:bold>\n                    =\u00a0CH\n                    <jats:sub>2<\/jats:sub>\n                    CH, respectively, indicating that electronic effects modulate T\n                    <jats:sub>1\/2<\/jats:sub>\n                    . Conversely, for\n                    <jats:bold>R\u00a0<\/jats:bold>\n                    =\u00a0Ph and\n                    <jats:bold>R\u00a0<\/jats:bold>\n                    =\u00a0CH\n                    <jats:sub>3<\/jats:sub>\n                    (CH\n                    <jats:sub>2<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    the SCO capability is progressively lost, with the latter showing no spin\u2010switching at all. Temperature\u2010dependent PL studies display an increase in emission upon the SCO, most pronounced for [Fe(\n                    <jats:bold>L<\/jats:bold>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    (CH\n                    <jats:sub>3<\/jats:sub>\n                    CH\n                    <jats:sub>2<\/jats:sub>\n                    CN)\n                    <jats:sub>2<\/jats:sub>\n                    ](ClO\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    \u20222CH\n                    <jats:sub>3<\/jats:sub>\n                    CH\n                    <jats:sub>2<\/jats:sub>\n                    CN, which can be attributed to electronic coupling between the SCO center and the fluorophore. This work establishes a single\u2010molecule SCO\u2010PL platform, in which the SCO behavior can be tuned independently from the PL response, paving the way for tailored molecular sensors and optical switches.\n                  <\/jats:p>","DOI":"10.1002\/chem.202501959","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T05:52:31Z","timestamp":1760075551000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["T\n                    <sub>\u00bd<\/sub>\n                    Tuning in a Synergistic BODIPY\u2010Tetrazole Fe(II) Spin\u2010Crossover\u2010Photoluminescence System via Co\u2010Ligand Variation"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4132-408X","authenticated-orcid":false,"given":"Martin","family":"Huber","sequence":"first","affiliation":[{"name":"Institute of Applied Synthetic Chemistry TU Wien  Getreidemarkt 9 Vienna 1060 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