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A series of dinuclear iridium pentahydride complexes bearing chiral BINAP ligands were synthesized and characterized. The complexes can be synthesized in good yields through the hydrogenation of mononuclear precursors obtained from the reaction of [Ir-(cod)]-BF with -BINAP and -BINAP. New heteroleptic dinuclear iridium complexes containing -BINAP and -BINAP at each iridium center could be synthesized using the proposed protocol in addition to the corresponding homoleptic dinuclear complexes. The UV-vis absorption and emission spectra as well as the CD activities have been studied. Theoretical studies of the photoexcited state of the dinuclear iridium complexes are discussed in relation to the future prospects of these compounds in photocatalysis.
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http://dx.doi.org/10.1021/acsomega.5c01889 | DOI Listing |
Inorg Chem
August 2025
Central Hospital of Dalian University of Technology, School of Chemistry, Dalian University of Technology, Dalian 116024, China.
Rational design of chiral metallodrugs with precise stereochemical control and enhanced photodynamic performance is pivotal for advancing precision oncology. Herein, we report the stepwise assembly of homochiral dinuclear Ir(III) triple-stranded metallohelices (ΔΔ-/ΛΛ-) via dynamic imine ligation followed by reductive stabilization, yielding configurationally stable amine-bridged helical architectures with locked chirality. While both enantiomers exhibit comparable dark toxicities, the ΔΔ-enantiomer demonstrates enhanced photodynamic activity against multiple cancer cell lines under white light irradiation.
View Article and Find Full Text PDFChem Sci
August 2025
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Anti-Infective Drug Discovery and Development, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, School of Chemistry, Sun Yat-Sen University Guangzhou 510006 P. R. China chenyu63@mai
The complexity of solid tumors in terms of light scattering, oxygen insufficiency, and redox imbalance complicates the strategic design of photoactivated therapy. In this work, an unprecedented photoactivated homolysis process of ferrocene is driven by the photochemistry of a conjugated cyclometalated iridium(iii) complex upon 970 nm three-photon excitation, exhibiting photo-uncaging, biocatalysis, and an ROS storm all in one moiety. Trapping assays, ultrafast spectroscopy, and DFT calculations reveal the release of Fe ions, the location of carbon-centered radicals, and the essential single electron transfer (SET) process for their generation.
View Article and Find Full Text PDFDalton Trans
August 2025
University of Siedlce, Faculty of Natural Sciences, 3 Maja 54, 08-110 Siedlce, Poland.
This paper deals with the synthesis and spectroscopic characterization of four important precursors, dinuclear [(C^N)Ir-μ-Cl] and [(C^N)Rh-μ-Cl] complexes, containing deprotonated 1-phenyl-1-pyrazole or 1-(2,4-difluorophenyl)-1-pyrazole as cyclometallating (C^N) ligands. The molecular structures of these μ-chloro-bridged complexes were confirmed by X-ray crystallography. These complexes showed luminescence in 1 : 1 MeOH/EtOH glasses at 77 K but were non-emissive in dichloromethane solutions at room temperature.
View Article and Find Full Text PDFThis study investigates the immobilization of dinuclear iridium-imidazole complexes onto indium tin oxides for the electrochemical oxygen evolution reaction (OER) in acidic media. The immobilized iridium complexes show exceptional catalytic activity and stability, which are attributed to the facile cleavage of the elongated -O bonds between the two iridium metal centers. This cleavage leads to the formation of dangling oxygen, which plays a crucial role in facilitating thermochemical water dissociation.
View Article and Find Full Text PDFACS Omega
June 2025
Department of Chemistry, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
A series of dinuclear iridium pentahydride complexes bearing chiral BINAP ligands were synthesized and characterized. The complexes can be synthesized in good yields through the hydrogenation of mononuclear precursors obtained from the reaction of [Ir-(cod)]-BF with -BINAP and -BINAP. New heteroleptic dinuclear iridium complexes containing -BINAP and -BINAP at each iridium center could be synthesized using the proposed protocol in addition to the corresponding homoleptic dinuclear complexes.
View Article and Find Full Text PDF