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Novel Polypyridyl Ruthenium(II) Complexes Containing Oxalamidines as Ligands.

Ruben, M. and Rau, Sven and Skirl, A. and Krause, K. and Görls, H. and Walther, D. and Vos, Johannes G. (2000) Novel Polypyridyl Ruthenium(II) Complexes Containing Oxalamidines as Ligands. Inorganica Chimica Acta, 303 (2). pp. 206-214. ISSN 0020-1693

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Abstract

The complexes [Ru(bpy)2(H2TPOA)](PF6)2 ⋅ 4H2O, (1); [Ru(Me-bpy)2(H2TPOA)](PF6)2 ⋅ 2H2O, (2); [Ru(bpy)2(H2TTOA)](PF6)2 ⋅ 2H2O, (3); [Ru(Me-bpy)2(H2TTOA)](PF6)2 ⋅ 2H2O, (4) and {[Ru(bpy)2]2(TPOA)}(PF6)2 ⋅ 2H2O, (5) (where bpy is 2,2´bipyridine; Me-bpy is 4,4´- dimethyl-2,2´-bipyridine; H2TPOA is N, N´, N´´, N´´´- tetraphenyloxalamidine; H2TTOA is N, N´, N´´, N´´´- tetratolyloxalamidine) have been synthesized and characterized by 1H-NMR, FAB-MS, infrared spectroscopy and elemental analysis. The X-ray investigation shows the coordination of the still protonated oxalamidine moiety via the 1,2−diimine unit. The dimeric compound (5) could be separated in its diastereoisomers (5´) and (5´´) by repeated recrystallisation. The diastereomeric forms exhibit different 1H-NMR spectra and slightly shifted electronic spectra. Compared with the model compound [Ru(bpy)3]2+, the absorption maxima of (1)–(5) are shifted to lower energies. The mononuclear complexes show Ru(III/II)- couples at about 0.9 V vs SCE, while for the dinuclear complex two well defined metal based redox couples are observed at 0.45 and 0.65 V indicating substantial interaction between the two metal centres.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:ruthenium complexes; oxalamidines; diastereomer separation; redox properties;
Subjects:Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/S0020-1693(00)00035-9
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:33
Deposited On:27 Oct 2006 by DORAS Administrator. Last Modified 30 Jan 2009 10:38

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