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Herein, we describe the synthesis from hydrogenobyric acid of zincobyric acid (<jats:bold>Znby<\/jats:bold>) and zincobalamin (<jats:bold>Znbl<\/jats:bold>), the Zn\u2010analogues of the natural cobalt\u2010corrins cobyric acid and vitamin\u2005B<jats:sub>12<\/jats:sub>, respectively. The solution structures of <jats:bold>Znby<\/jats:bold> and <jats:bold>Znbl<\/jats:bold> were studied by NMR\u2010spectroscopy. Single crystals of <jats:bold>Znby<\/jats:bold> were produced, providing the first X\u2010ray crystallographic structure of a zinc corrin. The structures of <jats:bold>Znby<\/jats:bold> and of computationally generated <jats:bold>Znbl<\/jats:bold> were found to resemble the corresponding Co<jats:sup>II<\/jats:sup>\u2010corrins, making such Zn\u2010corrins potentially useful for investigations of B<jats:sub>12<\/jats:sub>\u2010dependent processes. The singlet excited state of <jats:bold>Znby<\/jats:bold> had a short life\u2010time, limited by rapid intersystem crossing to the triplet state. <jats:bold>Znby<\/jats:bold> allowed the unprecedented observation of a corrin triplet (<jats:italic>E<\/jats:italic><jats:sup>T<\/jats:sup>=190\u2005kJ\u2009mol<jats:sup>\u22121<\/jats:sup>) and was found to be an excellent photo\u2010sensitizer for <jats:sup>1<\/jats:sup>O<jats:sub>2<\/jats:sub> (\u03a6<jats:sub>\u0394<\/jats:sub>=0.70).<\/jats:p>","DOI":"10.1002\/anie.201908428","type":"journal-article","created":{"date-parts":[[2019,8,17]],"date-time":"2019-08-17T07:09:12Z","timestamp":1566025752000},"page":"14568-14572","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Zinc Substitution of Cobalt in Vitamin\u2005B<sub>12<\/sub>: Zincobyric acid and Zincobalamin as Luminescent Structural B<sub>12<\/sub>\u2010Mimics"],"prefix":"10.1002","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2808-6534","authenticated-orcid":false,"given":"Christoph","family":"Kieninger","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry and Center for Molecular Biosciences (CMBI) University of Innsbruck  6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7603-6304","authenticated-orcid":false,"given":"Joseph A.","family":"Baker","sequence":"additional","affiliation":[{"name":"School of Biosciences University of Kent  Canterbury CT2 7NJ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7256-1219","authenticated-orcid":false,"given":"Maren","family":"Podewitz","sequence":"additional","affiliation":[{"name":"Institute of General, Inorganic and Theoretical Chemistry and Center for Molecular Biosciences (CMBI) University of Innsbruck  6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8774-9051","authenticated-orcid":false,"given":"Klaus","family":"Wurst","sequence":"additional","affiliation":[{"name":"Institute of General, Inorganic and Theoretical Chemistry and Center for Molecular Biosciences (CMBI) University of Innsbruck  6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steffen","family":"Jockusch","sequence":"additional","affiliation":[{"name":"Department of Chemistry Columbia University  New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5853-5409","authenticated-orcid":false,"given":"Andrew D.","family":"Lawrence","sequence":"additional","affiliation":[{"name":"School of Biosciences University of Kent  Canterbury CT2 7NJ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evelyne","family":"Deery","sequence":"additional","affiliation":[{"name":"School of Biosciences University of Kent  Canterbury CT2 7NJ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karl","family":"Gruber","sequence":"additional","affiliation":[{"name":"Institute for Molecular Biosciences University of  Graz Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0985-2299","authenticated-orcid":false,"given":"Klaus R.","family":"Liedl","sequence":"additional","affiliation":[{"name":"Institute of General, Inorganic and Theoretical Chemistry and Center for Molecular Biosciences (CMBI) University of Innsbruck  6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6028-6456","authenticated-orcid":false,"given":"Martin J.","family":"Warren","sequence":"additional","affiliation":[{"name":"School of Biosciences University of Kent  Canterbury CT2 7NJ UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2222-0587","authenticated-orcid":false,"given":"Bernhard","family":"Kr\u00e4utler","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry and Center for Molecular Biosciences (CMBI) University of Innsbruck  6020 Innsbruck Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,9,4]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.198800051"},{"key":"e_1_2_2_2_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19881000106"},{"key":"e_1_2_2_3_2","first-page":"73","volume-title":"Chemistry and Biochemistry of B12","author":"Pratt J. 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