Photochemical CO<sub>2</sub> reduction catalyzed by dinuclear Ir(III)–Re(I) complexes with π-conjugated quaterpyridine (qpy) bridging ligand
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초록
내용
Four quarter pyridyl (qpy) ligand-bridged Ir(III)-Re(I) heterometallic complexes were prepared, along with the fully π-conjugated Ir(III)-[π linker]-Re(I) complexes to elucidate the electron mediating and accumulative charge separation properties of the bridging π-linker in a bimetallic system. From the photophysical and electrochemical studies, it was found that the quarterpyridyl bridging ligand minimized the energy lowering of the qpy BL. Based on a series of anion absorption studies and spectroelectrochemical analyses, all Ir(III)-BL-Re(I) bimetallic complexes were found to exist as di-anionic form after fast reductive-quenching process in the presence of excess electron donor.