1H NMR assignment corrections and 1H, 13C, 15N NMR coordination shifts structural correlations in Fe(II), Ru(II) and Os(II) cationic complexes with 2,2′‐bipyridine and 1,10‐phenanthroline |
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| Authors: | Leszek Pazderski Tomasz Pawlak Jerzy Sitkowski Lech Kozerski Edward Szłyk |
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| Affiliation: | 1. Faculty of Chemistry, Nicholas Copernicus University, Gagarina 7, PL‐87100 Toruń, Poland;2. National Drug Institute, Che?mska 30/34, PL‐00725 Warsaw, Poland;3. Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, PL‐01224 Warsaw, Poland |
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| Abstract: | 1H, 13C and 15N NMR studies of iron(II), ruthenium(II) and osmium(II) tris‐chelated cationic complexes with 2,2′‐bipyridine and 1,10‐phenanthroline of the general formula [M(LL)3]2+ (M = Fe, Ru, Os; LL = bpy, phen) were performed. Inconsistent literature 1H signal assignments were corrected. Significant shielding of nitrogen‐adjacent protons [H(6) in bpy, H(2) in phen] and metal‐bonded nitrogens was observed, being enhanced in the series Ru(II) → Os(II) → Fe(II) for 1H, Fe(II) → Ru(II) → Os(II) for 15N and bpy → phen for both nuclei. The carbons are deshielded, the effect increasing in the order Ru(II) → Os(II) → Fe(II). Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | 15N NMR Fe(II) complexes Ru(II) complexes Os(II) complexes 2,2′ ‐bipyridine complexes 1,10‐phenanthroline complexes coordination shifts |
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