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Two trinuclear Ru(II) complexes of hetero-tritopic bridging ligands: synthesis, characterization, theoretical calculations, photophysical and electrochemical properties

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Abstract

Two hetero-tritopic bridging ligands L1 and L2 based on 2,2′-bipyridine and 1,10-phenanthroline moieties, and their corresponding Ru(II) complexes [{Ru(bpy)2}3(µ3−L1)](PF6)6 and [{Ru(bpy)2}3(µ3−L2)](PF6)6 (bpy = 2,2′-bipyridine), were synthesized. The molecular structures of both complexes were deduced by 1H NMR, ESI-MS, ESI-HRMS, elemental analyses, and IR spectroscopy. Quantum calculations on the free bridging ligands and their complexes are also presented. Both complexes display MLCT absorptions at around 454 nm, and emissions at around 613 nm in CH3CN solution at room temperature and at around 590 nm in EtOH–MeOH glassy matrix at 77 K. Cyclic and differential pulse voltammetry studies of both complexes reveal one reversible Ru(II)-centered oxidation and three reversible ligand-centered reductions, in each case.

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Acknowledgements

The authors thank the National Natural Science Foundation of China (21261019) for financial support.

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Authors and Affiliations

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

    Feixiang Cheng, Chixian He & Shiwen Yu

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  1. Feixiang Cheng
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  2. Chixian He
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  3. Shiwen Yu
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Correspondence to Feixiang Cheng.

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Cheng, F., He, C. & Yu, S. Two trinuclear Ru(II) complexes of hetero-tritopic bridging ligands: synthesis, characterization, theoretical calculations, photophysical and electrochemical properties. Transit Met Chem 42, 395–403 (2017). https://doi.org/10.1007/s11243-017-0142-z

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