Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 14, Pages 3963-3967Publisher
WILEY-BLACKWELL
DOI: 10.1002/chem.201002907
Keywords
deuteration; iridium; N-heterocyclic carbenes; reduction; water chemistry
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Funding
- Ministerio de Ciencia e Innovacion of Spain [CTQ2008-04460, CTQ2007-31175-E/BQU]
- Bancaixa [P1.1B2007-04]
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Two new water-soluble [IrI2(AcO)(bis-NHC)] complexes (NHC= N-heterocyclic carbene) incorporating a sulfonate functionality have been synthesized. The two complexes have been tested in the reduction of CO2 with H-2 and iPrOH, and their activity has been compared with similar species without the sulfonate moiety. In both reactions, the complex with the two ab-normally bound NHCs shows the best catalytic efficiencies, due to the higher sigma-electron-donor character of the ligand. Remarkably, the activities obtained for the reduction of CO2 under the transfer hydrogenation conditions are the best reported to date in terms of TON value (max. TON = 2700). The two new complexes have also shown very good activity in the selective deuteration of arylamines, a process that is known to proceed through a chelate assisted N-directed process.
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