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Molecules 2010, 15(3), 1324-1339; doi:10.3390/molecules15031324

Asymmetric Ruthenium(II) and Osmium(II) Complexes with New Bidentate Polyquinoline Ligands. Synthesis and NMR Characterization

Dipartimento Metodologie Fisiche e Chimiche per l’Ingegneria, Facoltà di Ingegneria, Università di Catania, Viale A. Doria 6, 95125, Catania, Italy
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Received: 25 January 2010 / Revised: 11 February 2010 / Accepted: 1 March 2010 / Published: 5 March 2010
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Abstract

A series of Ru(II) and Os(II) tris-chelate complexes with new bidentate 2-pyridylquinoline ligands have been synthesized and fully characterized by EA,1H-NMR and FAB-MS techniques. The new ligands are: L1 = 4-p-methoxyphenyl-6-bromo-2-(2′- pyridyl)quinoline (mphbr-pq) and L2 = 4-p-hydroxyphenyl-6-bromo-2-(2′-pyridyl)-quinoline (hphbr-pq). The complexes studied are: [Ru(bpy)2L1](PF6)2 (C1), [Ru(bpy)2L2](PF6)2 (C2), [Os(bpy)2L1](PF6)2 (C3), [Os(bpy)2L2](PF6)2 (C4) (bpy = 2,2′-bipyridine), [Ru(dmbpy)2L1](PF6)2 (C5), [Ru(dmbpy)2L2](PF6)2 (C6), [Os(dmbpy)2L1](PF6)2 (C7), and [Os(dmbpy)2L2](PF6)2 (C8) (dmbpy = 4,4′-dimethyl-2,2′-bipyridine). Moreover, new functionalized complexes C9-C12 were obtained by the basecatalyzed direct alkylation of C2, C4, C6, and C8 with 6-bromo-1-hexene. The complete assignment of the 1H-NMR spectra for the two new ligands (L1 and L2), and their Ru(II) or Os(II) complexes has been accomplished using a combination of one- and two-dimensional NMR techniques. The JH,H values have been determined for the majority of the resonances.
Keywords: bidentate quinoline aza-ligands; ruthenium asymmetric complexes; osmium asymmetric complexes bidentate quinoline aza-ligands; ruthenium asymmetric complexes; osmium asymmetric complexes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mamo, A.; Aureliano, A.; Recca, A. Asymmetric Ruthenium(II) and Osmium(II) Complexes with New Bidentate Polyquinoline Ligands. Synthesis and NMR Characterization. Molecules 2010, 15, 1324-1339.

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