Ru(II) complexes of tetradentate ligands related to 2,9-di(pyrid-2'-yl)-1,10-phenanthroline

Inorganic Chemistry
Gang ZhangRandolph Thummel

Abstract

A series of 1,10-phenanthrolines were prepared having additional ligating substituents at the 2,9-positions. These substituents were either a 4-substituted pyrid-2-yl, quinolin-2-yl, 1,8-naphthyrid-2-yl, N-methyl imidazo-2-yl, or N-methyl benzimidazo-2-yl group. Additionally, 3,6-di-(pyrid-2'-yl)-dipyrido[3,2-a:2',3'-c]phenazine was prepared. All but two of these ligands coordinated Ru(II) in a tetradentate equatorial fashion with two 4-methylpyridines bound in the axial sites. An X-ray structure analysis of the diimidazoyl system indicates considerable distortion from square planar geometry in the equatorial plane. Previously reported variations in the axial ligand for such complexes appear to have a stronger effect on the electronic absorption and redox properties of the system than similar changes in the equatorial ligand. In the presence of excess Ce(IV) as a sacrificial oxidant at pH 1, all the systems examined catalyze the decomposition of water to generate oxygen. Turnover numbers are modest, ranging from 146 to 416.

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Citations

Oct 12, 2011·Inorganic Chemistry·Maya El Ojaimi, Randolph P Thummel
Feb 22, 2012·Inorganic Chemistry·Nattawut KaveevivitchaiRandolph P Thummel
Aug 31, 2013·Inorganic Chemistry·Nattawut KaveevivitchaiRandolph P Thummel
Jan 1, 2009·Acta Crystallographica. Section E, Structure Reports Online·Xiaodong ChiMin Xia
Jan 1, 2010·Acta Crystallographica. Section E, Structure Reports Online·Hai-Wen Wang
Jan 1, 2010·Acta Crystallographica. Section E, Structure Reports Online·Wen-Bin WeiHai-Bo Wang
Apr 28, 2011·Acta Crystallographica. Section E, Structure Reports Online·Hualing ZhuJunjie Ren
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Jan 20, 2012·Acta Crystallographica. Section E, Structure Reports Online·Gui-Ming DengHe-Ming Zhang
Oct 2, 2015·Journal of the American Chemical Society·Lanka D WickramasingheRandolph P Thummel
Oct 2, 2015·Faraday Discussions·Lianpeng TongRandolph P Thummel
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