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Three trinuclear Ru(II) complexes containing 4,5-diazafluorene and 2,2′-bipyridine: synthesis, absorption spectrum, luminescence, and redox behavior.
- Source :
-
Journal of Coordination Chemistry . Feb2015, Vol. 68 Issue 4, p704-716. 13p. 3 Diagrams, 3 Charts, 4 Graphs. - Publication Year :
- 2015
-
Abstract
- Three heterotopic ligands L1, L2, and L3have been prepared by the reaction of 4,4′-bis(bromomethyl)-2,2′-bipyridine with 4,5-diazafluoren-9-oxime, 9-(2-hydroxy)phenylimino-4,5-diazafluorene, and 9-(4-hydroxy)phenylimino-4,5-diazafluorene, respectively, in DMF. The three ligands consist of two 4,5-diazafluorene units and one 2,2′-bipyridine unit. Ru(II) complexes [{Ru(bpy)2}3(μ3-L1−3)](PF6)6(bpy = 2,2′-bipyridine) were prepared by refluxing Ru(bpy)2Cl2·2H2O and the ligands in 2-methoxyethanol. The three Ru(II) complexes display metal-to-ligand charge-transfer absorption at 445–450 nm and one Ru(II)-centered oxidation at 1.32 V in CH3CN solution at room temperature. Upon excitation into the metal-to-ligand charge-transfer band, the emission intensities of [{Ru(bpy)2}3(μ3-L2)]6+and [{Ru(bpy)2}3(μ3-L3)]6+are almost equal to that of [{Ru(bpy)2}3(μ3-L1)]6+in CH3CN solution at room temperature, but weaker than that of [{Ru(bpy)2}3(μ3-L1)]6+in EtOH–MeOH (4 : 1, v/v) glassy matrix at 77 K. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00958972
- Volume :
- 68
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Coordination Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 100751397
- Full Text :
- https://doi.org/10.1080/00958972.2014.994512