Kinetic and mechanistic examination of NBu4[IrH2(CO)2I2] and NBu4[RhH2(CO)2I2] via para-hydrogen enhanced NMR spectroscopy
| Autor: | Simon B. Duckett, Diana R. Taylor, Sarah K. Hasnip, Michael J. Taylor, Graham K. Barlow |
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| Rok vydání: | 1999 |
| Předmět: |
Substitution reaction
Hydrogen Metals and Alloys Analytical chemistry chemistry.chemical_element General Chemistry Nuclear magnetic resonance spectroscopy Spin isomers of hydrogen Kinetic energy Catalysis Square pyramidal molecular geometry Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Materials Chemistry Ceramics and Composites Physical chemistry |
| Zdroj: | Chemical Communications. :889-890 |
| ISSN: | 1364-548X 1359-7345 |
| Popis: | para-Hydrogen enhanced NMR signals are used to show that NBu4[M(CO)2I2] (M = Rh, Ir) add hydrogen to form NBu4- {all-cis-[M(H)2(CO)2I2]} which for M = Ir undergoes H2 elimination in a step where ΔH‡ 106 ± 10 kJ mol–1 and ΔS‡± 6 J K–1 mol–1 while showing a rich substitution chemistry with PPh3 that leads to both charged and neutral products via square pyramidal Ir(H)2(CO)2I. |
| Databáze: | OpenAIRE |
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