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Bimetallic Cooperativity of a Ferrocene-based Iridium NHC Complex in Water Oxidation Catalysis: A New Frontier for Efficient Oxygen Evolution.
Chem Asian J
December 2024
CSIR - North East Institute of Science and Technology, Materials Sciences and Technology Division, Pulibor, CSIR-NEIST, 785006, Jorhat, INDIA.
Bimetallic catalysts have gained attention as promising contenders, owing to the synergistic interaction between two distinct metal centers. In this study, we present two N-heterocyclic carbene iridium(III) pentamethylcyclopentadienyl complexes [Cp*Ir(fcpyNHC)Cl]PF6 (1) and [Cp*Ir(pyNHC)Cl]PF6 (2) where 1 includes a ferrocene moiety acting as a bimetallic complex. Using ceric ammonium nitrate as a sacrificial oxidant, both complexes were tested for water oxidation.
View Article and Find Full Text PDFReversible Bimetallic Inhibition to Modulate Selectivity During Catalysis.
J Am Chem Soc
December 2024
Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC). Avenida Américo Vespucio 49, 41092 Sevilla, Spain.
Bimetallic complexes have demonstrated a great ability to enhance the activity of monometallic systems for bond activation and catalysis. In this work, we explore the opposite approach: using a second metal to passivate the activity of another by reversible bimetallic inhibition. To do so we have synthesized a family of nine electrophilic gold complexes of formula Au(PR)(NTf) ([NTf] = [N(SOCF)]) that can act as inhibitors in the semihydrogenation of terminal and internal alkynes catalyzed by the iconic iridium Vaska complex IrCl(CO)(PPh).
View Article and Find Full Text PDFCross-Dehydrogenative Coupling of Secondary Amines with Silanes Catalyzed by Agostic Iridium-NSi Species.
Inorg Chem
December 2024
Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Facultad de Ciencias, Universidad de Zaragoza - CSIC, 50009 Zaragoza, Spain.
An active catalytic system for the cross-dehydrogenative coupling (CDC) of a wide range of secondary amines with silanes is reported. The iridium(III) derivatives [Ir(H)(X)(κ-NSi)(L)] (NSi = {4,8-dimethylquinoline-2-yloxy}dimethylsilyl; L = coe, X = Cl, ; L = coe, X = OTf, ; L = PCy, X = Cl, ; L = PCy X = OTf, ), which are stabilized by a weak yet noticeable Ir···H-C agostic interaction between the iridium and one of the C-H bonds of the 8-Me substituent of the NSi ligand, have been prepared and fully characterized. These species have proven to be effective catalysts for the CDC of secondary amines with hydrosilanes.
View Article and Find Full Text PDFIridium trihydride and tetrahydride complexes and their role in catalytic polarisation transfer from hydrogen to pyruvate.
Chem Sci
December 2024
Department of Chemistry, University of York Heslington YO10 5DD UK
This work details how the unusual iridium tetrahydride [Ir(H)(IMes)(sulfoxide)]Na and trihydride [Ir(H)(IMes)(sulfoxide)] can be formed in a solvent dependent reaction of [IrCl(COD)(IMes)] with sulfoxide (dimethyl or methylphenyl), base, and H. In the case of dimethyl sulfoxide, the four hydride ligands of the tetrahydride are equivalent, and the IMes and sulfoxide ligands mutually . However, for phenyl methyl sulfoxide, this isomer of the tetrahydride forms alongside its counterpart where the remarkable symmetry breaking effect of the sulfoxide leads to it presenting four chemically distinct hydride ligands.
View Article and Find Full Text PDFAn artesunate-modified half-sandwich iridium(iii) complex inhibits colon cancer cell proliferation and metastasis through the STAT3 pathway.
RSC Chem Biol
December 2024
Jiangsu Collaborative Innovation Center of Biomedical Functional Materials/Nanjing Drum Tower Hospital, College of Chemistry and Materials Science, Nanjing Normal University Nanjing 210023 China
Colon cancer is one of the most commonly diagnosed cancers and is recognized as the most aggressive tumor of the digestive system. Aberrant activation of signal transducer and activator of transcription 3 (STAT3) is associated with proliferation, metastasis and immunosuppression of the tumor cells. Here, to inhibit the STAT3 pathway and suppress metastasis in colon cancer cells, the half-sandwich iridium complex Ir-ART containing an artesunate-derived ligand was synthesized.
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