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Synthesis, Electrochemistry, and Excited-State Properties of Three Ru(II) Quaterpyridine Complexes
Jennifer Rudd 
,
M. Kyle Brennaman,
Katherine E. Michaux,
Dennis L. Ashford,
Royce W. Murray,
Thomas. J. Meyer
,
M. Kyle Brennaman,
Katherine E. Michaux,
Dennis L. Ashford,
Royce W. Murray,
Thomas. J. Meyer
The Journal of Physical Chemistry A, Volume: 120, Issue: 11, Pages: 1845 - 1852
Swansea University Author:
Jennifer Rudd
-
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DOI (Published version): 10.1021/acs.jpca.6b00317
Abstract
The complexes [Ru(qpy)LL′]2+ (qpy = 2,2′:6′,2″:6″,2‴-quaterpyridine), with 1: L = acetonitrile, L′= chloride; 2: L = L′= acetonitrile; and 3: L = L′= vinylpyridine, have been prepared from [Ru(qpy) (Cl)2]. Their absorption spectra in CH3CN exhibit broad metal-to-ligand charge transfer (MLCT) absorpt...
| Published in: | The Journal of Physical Chemistry A |
|---|---|
| ISSN: | 1089-5639 1520-5215 |
| Published: |
2016
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa38733 |
| Abstract: |
The complexes [Ru(qpy)LL′]2+ (qpy = 2,2′:6′,2″:6″,2‴-quaterpyridine), with 1: L = acetonitrile, L′= chloride; 2: L = L′= acetonitrile; and 3: L = L′= vinylpyridine, have been prepared from [Ru(qpy) (Cl)2]. Their absorption spectra in CH3CN exhibit broad metal-to-ligand charge transfer (MLCT) absorptions arising from overlapping 1A1 → 1MLCT transitions. Photoluminescence is not observed at room temperature, but all three are weakly emissive in 4:1 ethanol/methanol glasses at 77 K with broad, featureless emissions observed between 600 and 1000 nm consistent with MLCT phosphorescence. Cyclic voltammograms in CH3CN reveal the expected RuIII/II redox couples. In 0.1 M trifluoroacetic acid (TFA), 1 and 2 undergo aquation to give [RuII(qpy)(OH2)2]2+, as evidenced by the appearance of waves for the couples [RuIII(qpy)(OH2)2]3+/[RuII(qpy)(OH2)2]2+, [RuIV(qpy)(O)(OH2)]2+/[RuIII(qpy)(OH2)2]3+, and [RuVI(qpy)(O)2]2+/[RuIV(qpy)(O)(OH2)]2+ in cyclic voltammograms. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
11 |
| Start Page: |
1845 |
| End Page: |
1852 |