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We show that emission is controlled by valence-edge s\u2013p mixing driven by lone-pair activation, with its extent governed by two distinct coordination-dependent structural modes. In highly coordinated octahedral systems, lone-pair exposure emerges through angular fluctuation-mediated transient off-centering, explaining finite luminescence in apparently centrosymmetric compounds. In lower-coordinate systems, intrinsic cage asymmetry produces persistent lone-pair exposure, often stabilized by organic cations, leading to stronger STE stabilization and enhanced emission. The higher stereochemical activity of Sn relative to Pb is rooted in greater dynamical structural degrees of freedom, opening more channels to activate the 5s2 lone pair. This coordination- and valence-shell-dependent effect is amplified in softer bromides with favorable energy-level alignment with ns2 cations. Overall, our results redefine the understanding of lone-pair stereochemistry, concluding that lone-pair stereochemistry in 0D metal halides is largely dynamical, activated by selective structural descriptors that govern excited-state localization and emission, providing a general design framework for efficient emitters.<\/jats:p>","DOI":"10.1021\/acs.inorgchem.6c03315","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T18:02:11Z","timestamp":1788976931000},"page":"21881-21895","source":"Crossref","is-referenced-by-count":0,"title":["Pushing the\nUnderstanding of ns2 Lone-Pair\nExposure in Zero-Dimensional Metal Halides: Molecular Dynamics and\nMachine Learning Reveal Unseen Structural Controls of Emission"],"prefix":"10.1021","volume":"65","author":[{"given":"Dhritismita","family":"Sarma","sequence":"first","affiliation":[{"name":"Indian Institute of Technology Hyderabad , , Kandi, , ,","place":["Sangareddy, Telangana, India, 502284"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Athira","family":"Palakkolil","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Hyderabad , , Kandi, , ,","place":["Sangareddy, Telangana, India, 502284"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4995-3326","authenticated-orcid":true,"given":"Arup","family":"Mahata","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Hyderabad , , Kandi, , ,","place":["Sangareddy, Telangana, India, 502284"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"issue":"10","key":"2026092108521552400_cit1","doi-asserted-by":"publisher","first-page":"2791","DOI":"10.1021\/acs.accounts.5b00229","article-title":"The Renaissance of Halide Perovskites and Their Evolution\nas Emerging Semiconductors","volume":"48","author":"Stoumpos","year":"2015","journal-title":"Acc. 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