Congratulations to Franci on her latest Paper
Franci's latest paper discusses PyrDPE-RuCl and PyrDPE-Ru(acac) complexes with a π-extended 2,7-di(4-phenylethynyl)pyrene linker, undergoing one-electron oxidations without displaying an intervalence charge-transfer band, suggesting a lack of electronic coupling between {Ru} entities. The electronically decoupled central pyrenyl fluorophore enables stable, red-shifted pyrene-based fluorescence emissions at 77 K, showcasing the unique electronic properties of these complexes.
Complexes PyrDPE-RuCl and PyrDPE-Ruacac with a π-extended 2,7-di(4-phenylethynyl)pyrene linker undergo simultaneous one-electron oxidations of their {Ru}-styryl entities. The absence of an intervalence charge-transfer (IVCT) band at intermediate stages, where the mixed-valent, singly oxidized radical cation is present, and spin density confinement to the terminal styryl ruthenium site(s) are tokens of a lack of electronic coupling between the {Ru} entities across the π-conjugated linker. The close similarity of the linker-based π → π* bands in the complexes and the free ligand and their insensitivity towards oxidations at the terminal sites indicate that the central pyrenyl fluorophore is electronically decoupled from the electron-rich {Ru}-styryl termini. As a consequence, the complexes offer stable pyrene-based fluorescence emissions at 77 K, which are red-shifted from that of the linker. Read more here.