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Preparation, photophysical, and electrochemical properties of two tetranuclear ruthenium(II) polypyridyl complexes containing 4,5-diazafluorene

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Abstract

Two tetrapodal ligands L1 and L2 containing 4,5-diazafluorene units have been synthesized and characterized. Both ligands are composed of two kinds of nonequivalent coordinating sites: one involves the 4-(4,5-diazafluoren-9-ylimino)phenoxy moiety, and the other one involves the 2-(4,5-diazafluoren-9-ylimino)phenoxy moiety. The Ru(II) complexes [(bpy)8Ru4(L1)](PF6)8 and [(bpy)8Ru4(L2)](PF6)8 (bpy = 2,2′-bipyridine) have been obtained by refluxing Ru(bpy)2Cl2·2H2O and each ligand in 2-methoxyethanol. Both complexes exhibit metal-to-ligand charge transfer (MLCT) absorptions at around 443 nm and emission at around 574 nm. Electrochemical studies of both complexes display one Ru(II)-centered oxidation at around 1.33 V and three ligand-centered reductions.

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Acknowledgments

We are grateful to the National Natural Science Foundation of China (21261019) and the Yunnan provincial science and technology department (2010ZC148) for financial support.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Qujing Normal University, Qujing, 655011, People’s Republic of China

    Feixiang Cheng, Chixian He & Hongju Yin

  2. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Ning Tang

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  1. Feixiang Cheng
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  2. Chixian He
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Correspondence to Feixiang Cheng.

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Cheng, F., He, C., Yin, H. et al. Preparation, photophysical, and electrochemical properties of two tetranuclear ruthenium(II) polypyridyl complexes containing 4,5-diazafluorene. Transition Met Chem 38, 259–265 (2013). https://doi.org/10.1007/s11243-012-9686-0

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