کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1337020 | 1500275 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigating the effects of supramolecularly caging ligands in [Ru(bpy)2L]2+ complexes Investigating the effects of supramolecularly caging ligands in [Ru(bpy)2L]2+ complexes](/preview/png/1337020.png)
Five ruthenium(II) complexes [Ru(bpy)2(L)][PF6]2 in which L is a 6-substituted 2,2′-bipyridine ligand (ligands 1–3), 5-(2-picoloyl) (4), or an N,O-donor (5) have been prepared and characterized to investigate the role of the intramolecular caging effect of pendant aryl-substituents on the electronic and photophysical properties. The single crystal structures of three of the complexes are reported; in [Ru(bpy)2(L)][PF6]2 where L = 6-(selenophen-2-yl)-2,2′-bipyridine, intra-cation face-to-face π-stacking of the selenophenyl unit and one pyridine ring of an adjacent ligand is observed. In comparison to [Ru(bpy)3]2+, the energy of the MLCT band in [Ru(bpy)2(L)]2+ for L = 1, 2, 3 or 4 is little affected, but a red-shift of 35 nm is observed for [Ru(bpy)2(5)]2+. The new complexes are emissive at room temperature in degassed MeCN solution; values of λmaxem range from 613 to 689 nm for [Ru(bpy)2(L)]2+ (L = 1 to 5). The electrochemical behaviour of [Ru(bpy)2(L)][PF6]2 for L = 1, 2 and 3 is similar; in contrast, [Ru(bpy)2(4)][PF6]2 exhibits more complicated ligand-based redox behaviour, and for [Ru(bpy)2(5)][PF6]2, the presence of the N,O-donor shifts the metal-based oxidation to lower potential.
The complexes [Ru(bpy)2(L)][PF6]2 where L is a 6-substituted 2,2′-bipyridine ligand (ligands 1–3), 5-(2-picoloyl) (4), or an N,O-donor (5) have been prepared and characterized in order to investigate the role of the intramolecular caging effect of pendant aryl-substituents on the electronic and photophysical properties of this family of ruthenium(II) complexes.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 64, 12 November 2013, Pages 38–44