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• W2007258129 abstract "Abstract The polyazine bridging ligands Cl 2 dpq and Me 2 dpq (where Cl 2 dpq=6,7-dichloro-2,3-bis(2′-pyridyl)quinoxaline and Me 2 dpq=6,7-dimethyl-2,3-bis(2′-pyridyl)quinoxaline) have been synthesized and their electrochemical and spectroscopic properties studied. Cl 2 dpq is easier to reduce than the unsubstituted dpq (dpq=2,3-bis(2′-pyridyl)quinoxaline) ligand by 250 mV, while Me 2 dpq is harder to reduce than dpq by 180 mV. These two substituted dpq ligands, along with dpp, dpq and dpb (dpp=2,3-bis(2′-pyridyl)pyrazine and dpb=2,3-bis(2′-pyridyl)benzoquinoxaline), give a series of five polyazine bridging ligands which provide a similar coordination environment to metals. In addition, this series of ligands makes possible the systematic variation of the energy of the lowest unoccupied molecular orbital (LUMO), the bridging ligand based π*. The relative energy of the π* orbitals is dpp>Me 2 dpq>dpq>Cl 2 dpq>dpb. The new monometallic and bimetallic systems of the form [(bpy) 2 Ru(BL)] 2+ and [(bpy) 2 Ru]2(BL) 4+ (where BLMe 2 dpq and Cl 2 dpq) have been synthesized and their spectroscopic and electrochemical properties studied. In addition, the previously studied systems with dpp, dpq and dpb as the bridging ligand have been prepared and their properties are reported herein for comparison. The metal complexes become easier to reduce as a function of bridging ligand with E 1/2 (reduction) for dpp 2 dpq 2 dpq E abs or E em for dpp>Me 2 dpq>dpq>Cl 2 dpq>dpb. These results indicate that it is possible to tune the spectroscopic and electrochemical properties of multimetallic complexes through the incorporation of substituent groups on polyazine bridging ligands." @default.
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• W2007258129 date "1993-04-01" @default.
• W2007258129 modified "2023-10-14" @default.
• W2007258129 title "Utilization of substituted polyazine bridging ligands to tune the spectroscopic and electrochemical properties of bimetallic ruthenium complexes" @default.
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• W2007258129 doi "https://doi.org/10.1016/s0020-1693(00)89261-0" @default.
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