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- W2079810205 endingPage "1282" @default.
- W2079810205 startingPage "1272" @default.
- W2079810205 abstract "A redox-active diamine ligand, 4,4'-bis(di-p-anisylamino)-2,2'-bipyridine (NNbpy), has been prepared. Electrochemical and spectroscopic studies suggest that little electronic coupling is present between two amine groups in NNbpy. After chelation with Ru(bpy)2 (bpy is 2,2'-bipyridine), the resulting complex displays two N(•+/0) processes at +1.02 and +1.16 V versus Ag/AgCl. In the mixed-valent state, rich near-infrared absorptions have been observed, which are believed to consist of multiple metal-to-ligand charge transfer and intervalence charge transfer transitions in the low-energy region. These results suggest that the amine-amine electronic coupling has been enhanced by chelation with Ru(bpy)2. In contrast, no efficient electronic coupling can be realized by chelation with Ir(ppy)2 (ppy is 2'-phenylpyridine) or Re(CO)3Cl. A ruthenium ion-mediated electron transfer mechanism, instead of through-space coupling, has been proposed to explain this phenomenon. For the purpose of comparison, a monoamine-substituted bpy ligand and corresponding Ru(bpy)2 complex have been synthesized and studied. In addition, EPR, DFT, and TDDFT studies have been performed to complement the experimental results." @default.
- W2079810205 created "2016-06-24" @default.
- W2079810205 creator A5004381631 @default.
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- W2079810205 creator A5024771479 @default.
- W2079810205 creator A5026343813 @default.
- W2079810205 creator A5052360639 @default.
- W2079810205 date "2015-01-27" @default.
- W2079810205 modified "2023-10-14" @default.
- W2079810205 title "Metal Chelation-Assisted Amine–Amine Electronic Coupling through the 4,4′-Positions of 2,2′-Bipyridine" @default.
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