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Here, the synthesis of dyads consisting of a porphyrin unit as photosensitizer and a rhenium unit as catalytically active site, which are held together by the rigid xanthene backbone, is presented. Mononuclear [(NN)Re(CO)\n                    <jats:sub>3<\/jats:sub>\n                    (Cl)] complexes for CO\n                    <jats:sub>2<\/jats:sub>\n                    reduction in which NN represents a bidentate diimine ligand (e.g., bipyridine or phenanthroline) lack light absorption in the visible region, resulting in poor photocatalysis upon illumination with visible light. To improve their visible\u2010light absorption, we have focused on the incorporation of a strongly absorbing free base or zinc porphyrin unit. Resulting photocatalytic experiments showed a strong dependence of the catalytic performance on both the type of photosensitizer and the excitation wavelengths. Most notably, the intramolecular hetero\u2010Pacman system containing a zinc porphyrin unit showed much better catalytic activity in the visible region (excitation wavelengths &gt;450\u2005nm) than the free base porphyrin version or the corresponding mononuclear rhenium compound or an intermolecular system comprised of a 1:1 mixture of the mononuclear analogues.\n                  <\/jats:p>","DOI":"10.1002\/chem.201806347","type":"journal-article","created":{"date-parts":[[2019,1,21]],"date-time":"2019-01-21T08:55:52Z","timestamp":1548060952000},"page":"4509-4519","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Sensitized Photochemical CO\n                    <sub>2<\/sub>\n                    Reduction by Hetero\u2010Pacman Compounds Linking a Re\n                    <sup>I<\/sup>\n                    Tricarbonyl with a Porphyrin 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