Rapid energy transfer in bichromophoric tris-bipyridyl/cyclometallated ruthenium(II) complexes

Dalton Transactions : an International Journal of Inorganic Chemistry
Sascha OttOlof Johansson

Abstract

The synthesis, characterization, and photophysical properties of the N6-N5C bichromophoric [(bpy)2Ru(I)Ru(ttpy)][PF6]3 (bpy is 2,2'-bipyridine and ttpy is 4'-p-tolyl-2,2':6',2''-terpyridine) and [(bpy)2Ru(II)Ru(ttpy)][PF6]3 (I and II are bpy-dipyridylbenzene ditopic ligands bridged by an ethynyl and phenyl unit, respectively) complexes are reported together with the model mononuclear complexes [(bpy)2Ru(I)][PF6]2, [(bpy)2Ru(II)][PF6]2, [Ru(VI)(ttpy)][PF6] (VI is 3,5-di(2-pyridyl)-biphenyl) and [Ru(dpb)(ttpy)][PF(6)] (Hdpb is 1,3-di(2-pyridyl)-benzene). The electrochemical data show that there is little ground state electronic communication between the metal centers in the bimetallic complexes. Selective excitation of the N(5)C unit in the bichromophoric systems leads to luminescence typical for a bis-tridentate cyclometallated ruthenium complex and is similar to the [Ru(VI)(ttpy)][PF6] model complex. In contrast, the luminescence from the tris-bidentate N6 unit is efficiently quenched by energy transfer to the N5C unit. The energy transfer rate has been determined by femtosecond pump-probe measurements to 0.7 ps in the ethynyl-linked [(bpy)2Ru(I)Ru(ttpy)][PF6]3 and to 1.5 ps in the phenyl-linked [(bpy)2Ru(II)Ru(ttpy)][PF6]3 (in...Continue Reading

References

Jul 4, 2002·Journal of the American Chemical Society·Yuan-Qing FangAlain Van Dorsselaer
Apr 10, 2003·Chemical Society Reviews·Neil Robertson, Craig A McGowan
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Jul 15, 2004·Dalton Transactions : an International Journal of Inorganic Chemistry·Andrew C BennistonRaymond Ziessel

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Citations

Nov 2, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Manoranjan BarSujoy Baitalik
Apr 5, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Xianlong SuDingguo Tang
Oct 20, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Isabelle M DixonJean-Louis Heully
Sep 25, 2009·Inorganic Chemistry·Paolo G BombenCurtis P Berlinguette
Dec 11, 2007·Inorganic Chemistry·Kenneth Kam-Wing LoShuk-Han Cheng
Apr 29, 2008·The Journal of Physical Chemistry. a·William HenryJohn J McGarvey

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