Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 744, Issue -, Pages 35-40Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2013.04.022
Keywords
Amido complex; Basicity; Oxidation
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Funding
- Deutsche Forschungsgemeinschaft [SCHN950/2-1]
- IDK NanoCat
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Iridium PNP amido complex [Ir(PMe3){N((CH2CH2PPr2)-Pr-i)(2)}] (3(PMe3)) was prepared in high yield starting from ethylene amine complex [Ir(C2H4){HN((CH2CH2PPr2)-Pr-i)(2)}]PF6. The high nucleophilicity of the amido nitrogen atom is demonstrated by facile N-methylation with MeOTf. The N-basicity within the series [IrL {N((CH2CH2PPr2)-Pr-i)(2)}] (3(L); L = PMe3, cyclooctene, CO) is quantified by determination of the corresponding amine complex pK(a) values. Examination of chemical and electrochemical oxidation of 3(L) point toward decomposition of the primary oxidation product by ligand centered disproportionation. The strong dependence of the basicity and oxidation potentials on the nature of L is rationalized on the basis of 3c-4e N-M-L pi-interactions. (C) 2013 Elsevier B.V. All rights reserved.
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