The effects of pendant vs. fused thiophene attachment upon the luminescence lifetimes and electrochemistry of tris(2,2′-bipyridine)ruthenium(II) complexes

被引:13
|
作者
Nurkkala, Lasse J. [1 ]
Steen, Robert O. [1 ]
Friberg, Henrik K. J. [1 ]
Haeggstroem, Johanna A. [1 ]
Bernhardt, Paul V. [2 ]
Riley, Mark J. [2 ]
Dunne, Simon J. [1 ]
机构
[1] Malardalen Univ, Dept Biol & Chem Engn, S-63105 Eskilstuna, Sweden
[2] Univ Queensland, Dept Chem, Sch Mol & Microbial Sci, Brisbane, Qld 4072, Australia
关键词
luminescence; N ligands; ruthenium; ligand design; cyclic voltammetry;
D O I
10.1002/ejic.200800456
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The electrochemical and photophysical properties for a range of tris(2,2'-bipyridine)ruthenium(II) complexes in which a thiophene substituent is attached to one of the bipyridine ligands by either a pendant or a fused mode have been determined. The fused mode of attachment eliminates torsional movement between the thiophene unit and the chelating bipyridine, thereby offering optimal overlap between the pi-systems of the chelating unit and the attached thiophene unit. The electrochemical properties of these complexes were found to be similar; however, the luminescence lifetimes and intensities (in CH3CN at room temperature) were found to be correlated to the mode of attachment. The longest luminescence lifetime was observed for the complex [Ru(bPy)(2)(4-(thiophen-2-yl)-2,2'-bipyridinel](2+) (3000 ns), as compared to the prototypic [Ru(bpy)(3)](2+), (1745 ns). This complex also had the highest quantum yield (0.045). In the four isomeric complexes, where the thiophene ring was fused to the b or c face of the pyridine ring, the lifetimes fell in the interval 2751510 ns, and the quantum yield ranged between 0.0047 and 0.014. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
引用
收藏
页码:4101 / 4110
页数:10
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