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Issue 44, 2011
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Trinuclear ruthenium dendrons based on bridging PHEHAT and TPAC ligands

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Abstract

Novel polynuclear compounds, the trinuclear precursor complex cis-{[(phen)2Ru(PHEHAT)]2Ru(CH3CN)2}6+4 and the trinuclear TPAC (tetrapyrido[3,2-a:2′,3′-c:3′′,2′-h:2′′′,3′′′-j]acridine) complex {[(phen)2Ru(PHEHAT)]2Ru(TPAC)}6+5 have been prepared. Their electrochemistry and photophysics indicate that the 3MLCT (metal to ligand charge transfer) emissions involve the external {Ru(PHEHAT)} moieties for both complexes and there is no spectro-electrochemical correlation. The trinuclear dendron with the TPAC ligand represents a key compound for future constructions of much larger species thanks to the TPAC that could bridge another polynuclear precursor. For decreasing the length of preparation of these compounds, microwave assisted syntheses have been tested and used not only for the targeted complexes but also for the precursors ((phen)2RuCl2, {(phen)2Ru(phendione)}2+, {(phen)2Ru(PHEHAT)}2+ (PHEHAT = 1,10-phenanthrolino[5,6-b]1,4,5,8,9,12-hexaazatriphenylene), (DMSO)4RuCl2), and for the bridging TPAC ligand itself. The microwave method allows a drastic decrease of the preparation times, especially in the case of the TPAC, from 8 days to 60 min.

Graphical abstract: Trinuclear ruthenium dendrons based on bridging PHEHAT and TPAC ligands

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Supplementary files

Article information


Submitted
12 Apr 2011
Accepted
29 Jun 2011
First published
19 Aug 2011

Dalton Trans., 2011,40, 11704-11711
Article type
Paper

Trinuclear ruthenium dendrons based on bridging PHEHAT and TPAC ligands

K. Servaty, C. Moucheron and A. Kirsch-De Mesmaeker, Dalton Trans., 2011, 40, 11704
DOI: 10.1039/C1DT10639B

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