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While it has been shown that tetrazines, as electronically amphiphilic ligands, undergo anion\u2013\u03c0, \u03c0\u2013\u03c0, and transition metal\u2010based adduct formation reactions, adducts of tetrazines with main group metal Lewis acids have not yet been structurally characterized. We report spectroscopic and single crystal X\u2010ray diffraction (SC\u2010XRD) analyses of tetrazine\u2010boron halide adducts in solution and in the solid state, respectively. With the aid of (diffusion\u2010ordered) nuclear magnetic resonance (DOSY\u2010)NMR spectroscopy dynamic equilibria between tetrazine\u2010boron halide adducts have been proven, while solid state structures show localized 1:1 tetrazine\u2010boron halide adducts.<\/jats:p>","DOI":"10.1002\/open.70317","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T13:15:50Z","timestamp":1790860550000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["1,2,4,5\u2010Tetrazine\u2010Boron Halide Adduct Formation Unraveled in Solution and Solid State"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4823-8646","authenticated-orcid":false,"given":"Jona","family":"Voss","sequence":"first","affiliation":[{"name":"Organic and Bioorganic Chemistry Bielefeld University  Bielefeld 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