Mononuclear (C5R5)Ir-complexes with π-linked biaryls: Stability and fluorescence quenching

Publication date: Available online 6 February 2020Source: Journal of Organometallic ChemistryAuthor(s): Vladimir B. Kharitonov, Yulia V. Nelyubina, Dmitry V. Muratov, Nikolay E. Shepel', Dmitry A. LoginovAbstractThe arene iridium complexes [(η5-C5R5)M(η6-PhX)](SbF6)2 (1a: R = H, X = CH=CHPh; 1b: R = Me, X = CH=CHPh; 2: R = Me, X = C≡CPh; 3: R = Me, X = 4-Me-1H-isochromen-1-one) were synthesized by the reactions of the halides [CpIrI2]n or [Cp*IrCl2]2 with trans-stilbene, tolan and 3-phenyl-4-methyl-1H-isochromen-1-one in the presence of AgSbF6. They have proved to be stable towards the arene replacement with nucleophiles (such as acetonitrile, water and KI). The structures of 1b(SbF6)2 and 3(SbF6)2 were determined by X-ray diffraction. The experimental and DFT calculation data showed that the coordination of trans-stilbene and 3-phenyl-4-methyl-1H-isochromen-1-one with the Cp*Ir-moiety leads to the fluorescence quenching due to the intramolecular charge transfer from the ligand to iridium.Graphical abstract

Source: Journal of Organometallic Chemistry - February 6, 2020 Category: Chemistry Source Type: research