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Here we introduce a dual\u2010key, coordination\u2010activated through\u2010space charge\u2010transfer (TSCT) platform that enables programmable modulation of spin\u2010dependent excited\u2010state pathways in solution. Flexible donor\u2010\u03c3\u2010acceptor ligands Cz\u2010nC\u2010TPP comprising a carbazole donor (Cz) and a terpyridine acceptor (TPP) linked by alkyl spacers (\n                    <jats:italic>n<\/jats:italic>\n                    = 2, 4, 6, 8) predominantly emit from local excited states and show negligible oxygen sensitivity before metal binding. Upon coordination with ZnX\n                    <jats:sub>2<\/jats:sub>\n                    (X = Cl, Br, I), a TSCT channel is activated without covalent re\u2010engineering, producing microsecond delayed fluorescence consistent with TSCT\u2010based thermally activated delayed fluorescence. Spacer length acts as a geometric key that regulates access to folded TSCT geometries and \u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    , whereas halide identity serves as a spin key that tunes spin\u2010orbit coupling and triplet involvement. Together, these inputs enable predictable modulation of delayed, triplet\u2010associated emission across the series. Notably, the\n                    <jats:bold>\n                      Cz\u20106C\u2010TPP\u2010ZnBr\n                      <jats:sub>2<\/jats:sub>\n                    <\/jats:bold>\n                    complex shows the best balance between delayed\u2010emission prominence and overall brightness. This programmability enables a modular library of dissolved\u2010oxygen probes with turn\u2010off and ratiometric responses, visible color evolution, low detection limits, and rapid, reversible responses.\n                  <\/jats:p>","DOI":"10.1002\/anie.5167793","type":"journal-article","created":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T07:45:46Z","timestamp":1776152746000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Control of Conformation and Spin for Programmable Singlet\u2010Triplet Exciton Balance in Through\u2010Space Charge\u2010Transfer Emitters"],"prefix":"10.1002","volume":"65","author":[{"given":"Jiangang","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuyang","family":"Ju","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Xiao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengzhu","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongjing","family":"Deng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-4564-6342","authenticated-orcid":false,"given":"Pengfei","family":"She","sequence":"additional","affiliation":[{"name":"College of Electronic and Optical Engineering &amp; College of Flexible Electronics (Future Technology) Nanjing University of Posts and Telecommunications  Nanjing China"},{"name":"Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University  Hong Kong P. 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