{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T03:54:54Z","timestamp":1788494094788,"version":"build-2803163510"},"reference-count":67,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2023,2,16]],"date-time":"2023-02-16T00:00:00Z","timestamp":1676505600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft (DFG)","doi-asserted-by":"publisher","award":["495050545"],"award-info":[{"award-number":["495050545"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft (DFG)","doi-asserted-by":"publisher","award":["364549901"],"award-info":[{"award-number":["364549901"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft (DFG)","doi-asserted-by":"publisher","award":["P2019-0110"],"award-info":[{"award-number":["P2019-0110"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Rhenium(I) complexes of type [Re(CO)3(NN)Cl] (NN = \u03b1-diimine) with MLCT absorption in the orange-red region of the visible spectrum have been synthesized and fully characterized, including single crystal X-ray diffraction on two complexes. The strong bathochromic shift of MLCT absorption was achieved through extension of the \u03c0-system of the electron-poor bidiazine ligand 4,4\u2032-bipyrimidine by the addition of fused phenyl rings, resulting in 4,4\u2032-biquinazoline. Furthermore, upon anionic cyclization of the twisted bidiazine, a new 4N-doped perylene ligand, namely, 1,3,10,12-tetraazaperylene, was obtained. Electrochemical characterization revealed a significant stabilization of the LUMO in this series, with the first reduction of the azaperylene found at E1\/2(0\/\u2212) = \u22121.131 V vs. Fc+\/Fc, which is the most anodic half-wave potential observed for N-doped perylene derivatives so far. The low LUMO energies were directly correlated to the photophysical properties of the respective complexes, resulting in a strongly red-shifted MLCT absorption band in chloroform with a \u03bbmax = 586 nm and high extinction coefficients (\u03b5586nm &gt; 5000 M\u22121 cm\u22121) ranging above 700 nm in the case of the tetraazaperylene complex. Such low-energy MLCT absorption is highly unusual for Re(I) \u03b1-diimine complexes, for which these bands are typically found in the near UV. The reported 1,3,10,12-tetraazaperylene complex displayed the [Re(CO)3(\u03b1-diimine)Cl] complex with the strongest MLCT red shift ever reported. UV\u2013Vis NIR spectroelectrochemical investigations gave further insights into the nature and stability of the reduced states. The electron-poor ligands explored herein open up a new path for designing metal complexes with strongly red-shifted absorption, thus enabling photocatalysis and photomedical applications with low-energy, tissue-penetrating red light in future.<\/jats:p>","DOI":"10.3390\/molecules28041905","type":"journal-article","created":{"date-parts":[[2023,2,17]],"date-time":"2023-02-17T01:32:56Z","timestamp":1676597576000},"page":"1905","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Red Light Absorption of [ReI(CO)3(\u03b1-diimine)Cl] Complexes through Extension of the 4,4\u2032-Bipyrimidine Ligand\u2019s \u03c0-System"],"prefix":"10.3390","volume":"28","author":[{"given":"Nicolas","family":"Meitinger","sequence":"first","affiliation":[{"name":"Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2338-2825","authenticated-orcid":false,"given":"Subrata","family":"Mandal","sequence":"additional","affiliation":[{"name":"Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dieter","family":"Sorsche","sequence":"additional","affiliation":[{"name":"Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9633-0730","authenticated-orcid":false,"given":"Andrea","family":"Pannwitz","sequence":"additional","affiliation":[{"name":"Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9635-6009","authenticated-orcid":false,"given":"Sven","family":"Rau","sequence":"additional","affiliation":[{"name":"Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4022","DOI":"10.1021\/cr050193e","article-title":"Hydrogen Production by Molecular Photocatalysis","volume":"107","author":"Esswein","year":"2007","journal-title":"Chem. 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