Stefan Buss, Leon Geerkens, Iván Maisuls, Jutta Kösters, Nils Bäumer, Gustavo Fernández, Cristian A. Strassert
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引用次数: 0
Abstract
The synthesis, characterization, and photophysical properties of 16 d8-configured metal complexes featuring Pt(II) or Pd(II) centers with N*N∧C-coordinated ligands is presented. Key findings include the discovery that distortion of the coordination plane improves solubility, as observed for compounds with a pyridine-N-donor instead of a thiazole unit. In addition, we found that substitution of the chlorido coligand by a monodentate cyanido unit enhances the emitters’ performance by decreasing the nonradiative decay rate. The switch from Pt(II) to Pd(II) resulted in weaker ligand field splitting and reduced spin–orbit coupling, leading to longer average lifetimes without luminescence at room temperature. Interestingly, complexes with a cyclometalated thiophenyl moiety exhibited a red-shifted luminescence and dual emission. Finally, we observed that the photoinduced generation of singlet dioxygen (1O2), a highly reactive oxygen species, is critically influenced by the chelated metal centers and by the monodentate coligands, as they control the 1O2 photoproduction quantum yields. These results have significant implications for photocatalysis, optoelectronics, and biomedical applications.
期刊介绍:
Organometallics is the flagship journal of organometallic chemistry and records progress in one of the most active fields of science, bridging organic and inorganic chemistry. The journal publishes Articles, Communications, Reviews, and Tutorials (instructional overviews) that depict research on the synthesis, structure, bonding, chemical reactivity, and reaction mechanisms for a variety of applications, including catalyst design and catalytic processes; main-group, transition-metal, and lanthanide and actinide metal chemistry; synthetic aspects of polymer science and materials science; and bioorganometallic chemistry.