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The title compound has two polymorphic crystal structures having strikingly different absorption and luminescence spectra that result from different packing motifs in the crystal lattice. The polymorph with brick wall\u2010like packing of molecules is white and shows very weak violet fluorescence whereas the second polymorph, where molecules are arranged in columnar stacks, is bright yellow and displays intense green fluorescence with maximum at 487\u2005nm (20530\u2009cm<jats:sup>\u22121<\/jats:sup>). In the white polymorph, where the distance between neighboring chromophores is increased, absorption and fluorescence spectra are similar to those of monomer in solution, and intersystem crossing to triplet manifold is the dominant pathway of relaxation. In the yellow polymorph, molecules within the columnar stacks are rotated which mitigates the steric hindrance and leads to closer \u03c0\u2010stacking of the pyrene cores. That increases the \u03c0\u03c0 overlap and strengthens intermolecular interactions decreasing energy of the excited states. This affects emission spectra and photophysical processes\u2013fluorescence yield grows whereas triplet formation yield decreases when S<jats:sub>1<\/jats:sub> is lowered below higher triplet states and conditions for effective vibronic spin\u2010orbit coupling are not favorable. The effect is not observed for other similar pyrene derivatives, testifying the uniqueness of the phenomenon.<\/jats:p>","DOI":"10.1002\/cphc.202400457","type":"journal-article","created":{"date-parts":[[2024,6,3]],"date-time":"2024-06-03T04:08:31Z","timestamp":1717387711000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Color Polymorphism and Room Temperature Phosphorescence of 4\u2010Bromo\u20102,7\u2010Di\u2010Tert\u2010Butyl\u2010 9\u2010Methoxypyrene"],"prefix":"10.1002","volume":"25","author":[{"given":"Olaf W.","family":"Morawski","sequence":"first","affiliation":[{"name":"Division of Radiation Physics and Spectroscopy Group of molecular photophysics Institute of Physics Polish Academy of Sciences  Al. 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