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Heteroleptic 5,5-disubstituted-2,2-bipyridine complexes of ruthenium(II): spectral, electrochemical, and structural investigations
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yang, Xiao-Juan Janiak, Christoph Heinze, Jürgen Drepper, Friedrich Mayer, Peter Piotrowski, Holger Klüfers, Peter |
| Copyright Year | 2001 |
| Abstract | The optical absorption and luminescence spectra, the electrochemical behavior, and the X-ray crystal structure of a series of three heteroleptic Ru(II) complexes in comparison to [Ru(bipy)3] 2 + are reported. The complexes examined are of the type [Ru(bipy)2(bipy)](PF6)2 with bipy =2,2-bipyridine and bipy= 5,5-diamino-2,2-bipyridine (4), diethyl-2,2-bipyridine-5,5-dicarboxylate (5 )o r 5,5-bis(ethoxycarbonylamino)-2,2-bipyridine (6). Absorption bands and redox waves are fully assigned. The position of bands or half-wave potentials can be correlated with the electron-withdrawing/donating properties of the bipy ligand. The relative emission intensities of complexes with 4 and 6 can be modulated through the hydrogen-bonding capabilities of the solvent (MeOH and H2O). The cyclic voltammograms between + 1.5 and − 2.2 V show a reversible metal-oxidation wave and two to four reduction waves, attributed to successive reductions of the different ligands. Ligand 4 can only be oxidized. Correlations between spectroscopical and electrochemical data give a linear relation for h max ,h max versus E1/2. A comparison with complexes with the analogous 4,4-disubstituted-2,2-bipyridine ligands reveals pronounced differences in the position of the MLCT-absorption and emission bands due to the 5- or 4-position of the substituent. © 2001 Elsevier Science B.V. All rights reserved. |
| Starting Page | 103 |
| Ending Page | 116 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/S0020-1693(01)00414-5 |
| Volume Number | 318 |
| Alternate Webpage(s) | http://www.chemie.uni-muenchen.de/ac/kluefers/homepage/publ_pdf/janiak_inorgchimacta_2001.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/S0020-1693%2801%2900414-5 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
