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Issue 9, 2010
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Synthesis and characterization of regioselective substituted tetrapyridophenazine ligands and their Ru(II) complexes

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Abstract

A series of novel regioselective substituted tpphz ligands and two novel mononuclear ruthenium complexes of the type [(tbbpy)2Ru(tpphzRn)](PF6)2 (where tbbpy = 4,4′-di-tert.-butyl-2,2′-bipyridine, tpphz = tetrapyrido[3,2-a:2′,3′-c:3′′,2′′-h:2′′′,3′′′-j]phenazine, with n = 2 and R represents the bromine substituents at different positions) have been synthesized. All compounds were completely characterized by NMR and MS spectroscopy, absorption and steady-state emission spectroscopy as well as emission lifetime and electrochemical measurements. Additionally the solid-state structures of the two isomers [(tbbpy)2Ru(Br2tpphz)](PF6)26 and [(tbbpy)2Ru(tpphzBr2)](PF6)27 are presented and compared with the results of density-functional theory calculations (DFT). Furthermore calculated Raman spectra were obtained by means of DFT calculations and used to assign the vibrational modes of the measured off resonance Raman spectra. A clear influence caused by the electronic effects of the different type and position of the substituents of tpphz on the photophysical behavior was observed.

Graphical abstract: Synthesis and characterization of regioselective substituted tetrapyridophenazine ligands and their Ru(ii) complexes

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Publication details

The article was received on 25 Aug 2009, accepted on 12 Nov 2009 and first published on 19 Jan 2010


Article type: Paper
DOI: 10.1039/B917484B
Citation: Dalton Trans., 2010,39, 2359-2370
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    Synthesis and characterization of regioselective substituted tetrapyridophenazine ligands and their Ru(II) complexes

    M. Karnahl, S. Tschierlei, C. Kuhnt, B. Dietzek, M. Schmitt, J. Popp, M. Schwalbe, S. Krieck, H. Görls, F. W. Heinemann and S. Rau, Dalton Trans., 2010, 39, 2359
    DOI: 10.1039/B917484B

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