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The final products were obtained in yields of up to 36\u2009% and characterized by NMR, X\u2010ray and combustion analysis. These complexes have structured green\u2010blue emission spectra with Commission Internationale de l\u2019\u00c9clairage (CIE\n                    <jats:sub>xy<\/jats:sub>\n                    ) coordinates of (0.21;0.46). Excellent photoluminescence quantum yields (PLQYs) ranging from 87\u2009%\u201391\u2009% were found. The emission lifetimes vary from 33\u2005\u03bcs to 43\u2005\u03bcs. Calculations on the B3LYP\/6\u2010311++G** level of theory reveal, that the nature of the emissive state is dependent on the positional regioisomerism of the SFX motif. The 2\u2010SFX complexes demonstrate ligand\u2010centered (\n                    <jats:sup>3<\/jats:sup>\n                    LC) emission, while the 2\u2019\u2010SFX regioisomer with the mesacac ligand shows a strong\n                    <jats:sup>3<\/jats:sup>\n                    MLCT character.\n                  <\/jats:p>","DOI":"10.1002\/chem.202304263","type":"journal-article","created":{"date-parts":[[2024,3,7]],"date-time":"2024-03-07T07:29:48Z","timestamp":1709796588000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Phosphorescent Platinum(II) Complexes with a Spiro\u2010fused Xanthene Unit: Synthesis and Photophysical Properties"],"prefix":"10.1002","volume":"30","author":[{"given":"Tim","family":"Riesebeck","sequence":"first","affiliation":[{"name":"Physikalische Organische Chemie Technische Universit\u00e4t Dresden  Bergstra\u00dfe 66 01069 Dresden 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