Projects per year
Abstract
The UV-light-induced CO release characteristics of a series of ruthenium(II) carbonyl complexes of the form trans-Cl[RuLCl2(CO)2] (L = 4,4′-dimethyl-2,2′-bipyridine, 4′-methyl-2,2′-bipyridine-4-carboxylic acid, or 2,2′-bipyridine-4,4′-dicarboxylic acid) have been elucidated using a combination of UV-vis absorbance and Fourier transform infrared spectroscopies, multivariate curve resolution alternating least-squares analysis, and density functional theory calculations. In acetonitrile, photolysis appears to proceed via a serial three-step mechanism involving the sequential formation of [RuL(CO)(CH3CN)Cl2], [RuL(CH3CN)2Cl2], and [RuL(CH3CN)3Cl]+. Release of the first CO molecule occurs quickly (k1 ≫ 3 min-1), while release of the second CO molecule proceeds at a much more modest rate (k2 = 0.099-0.17 min-1) and is slowed by the presence of electron-withdrawing carboxyl substituents on the bipyridine ligand. In aqueous media (1% dimethyl sulfoxide in H2O), the two photodecarbonylation steps proceed much more slowly (k1 = 0.46-1.3 min-1 and k2 = 0.026-0.035 min-1, respectively) and the influence of the carboxyl groups is less pronounced. These results have implications for the design of new light-responsive CO-releasing molecules ("photoCORMs") intended for future medical use.
Original language | English |
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Pages (from-to) | 5941-5952 |
Number of pages | 12 |
Journal | Inorganic Chemistry |
Volume | 56 |
Issue number | 10 |
DOIs | |
Publication status | Published - 15 May 2017 |
Projects
- 2 Finished
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Expanding the molecular tool set for structural studies of proteins and their complexes
Graham, B. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
1/01/14 → 31/12/17
Project: Research
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Coupling biophotonic modalities with machine based recognition systems for disease diagnosis
Wood, B. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
31/12/12 → 31/12/17
Project: Research