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Korean Society of Photoscience (한국광과학회)
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Synthesis, Characterizations, and Intramolecular Quenching Behavior of an Axially-Linked Trinuclear Molecular Wire Containing Ruthenium(II) Porphycenes

  • Abe, Masaaki (Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University) ;
  • Ashigara, Shiho (Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University) ;
  • Okawara, Toru (Department of Materials Chemistry and Chemical Engineering, National Institute of Technology, Kitakyushu College) ;
  • Hisaeda, Yoshio (Center for Molecular Systems (CMS), Kyushu University)
  • Received : 2015.03.14
  • Accepted : 2015.03.28
  • Published : 2015.03.01
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Abstract

A new trinuclear complex $[Ru(TPrPc)(CO)]_2[Ru(pytpy)_2](PF_6)_2$ (TPrPc = 2,7,12,17-tetra-n-propylporphycenato dianion and pytpy = 4'-(4-pyridyl)-2,2':6',2"-terpyridine) has been synthesized and characterized as the first example of a discrete molecular wire containing metalloporohycenes as a building block. The trinuclear complex shows multiple-step redox behavior in 0.1 M n-$Bu_4NPF_6$-dichloromethane. The mononuclear $[Ru(pytpy)_2]^{2+}$ precursor shows emission at 640 nm (deaerated acetone, 298 K) upon illumination at the metal-to-ligand charge transfer (MLCT) band at 495 nm, but the trinuclear molecular wire is found to be non-emissive upon photoexcitation at the central $[Ru(pytpy)_2]^{2+}$ entity, indicating an efficient quenching ability of the axially-linked, ruthenium(II)-porphycene chromophores in an intramolecular fashion.

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References

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