Issue 44, 2011

Trinuclear ruthenium dendrons based on bridging PHEHAT and TPAC ligands

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

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2011
Accepted
29 Jun 2011
First published
19 Aug 2011

Dalton Trans., 2011,40, 11704-11711

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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