2026-05-28T18:05:11Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/113362026-02-07T01:05:31Zcom_10259_4363com_10259_5086com_10259_2604col_10259_4364

00925njm 22002777a 4500 dc Yagüe Izquierdo, Cristina author Echevarría Poza, Igor author Vaquero Gutiérrez, Mónica author Fidalgo Zorrilla, Jairo author Carbayo Martín, Mª Aránzazu author Jalón Sotés, Félix Ángel author Lima, João C. author Moro, Artur J. author Manzano Manrique, Blanca Rosa author Espino Ordóñez, Gustavo author 2020-09 Five new RuII polypyridyl complexes bearing N-(arylsulfonyl)-8-amidoquinolate ligands and three of their biscyclometalated IrIII congeners have been prepared and employed as photocatalysts (PCs) in the photooxidation of benzylamines with O2. In particular, the new RuII complexes do not exhibit photoluminescence, rather they harvest visible light efficiently and are very stable in solution under irradiation with blue light. Their non-emissive behavior has been related to the low electrochemical energy gaps and rationalized on the basis of theoretical calculations (DFT analysis) that predict low S0←T1 energy values. Moreover, the RuII complexes, despite being non-emissive, display excellent activities in the selective photocatalytic transformation of benzylamines into the corresponding imines. The presence of an electron-withdrawing group (-CF3) on the arene ring of the N-(arylsulfonyl)-8-amidoquinolate ligand improves the photocatalytic activity of the corresponding photocatalyst. Furthermore, all the experimental evidence, including transient absorption spectroscopy measurements suggest that singlet oxygen is the actual oxidant. The IrIII analogues are considerably more photosensitive and consequently less efficient photosensitizers (PSs). 0947-6539 https://hdl.handle.net/10259/11336 10.1002/chem.202001460 1521-3765 Photocatalysis Photooxidation of amines RuIIpolypyridyl complexes Singlet oxygen Sulfonamides Non‐emissive RuII Polypyridyl Complexes as Efficient and Selective Photosensitizers for the Photooxidation of Benzylamines