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Photochemical Formation and Electronic Structure of an Alkane ?-Complex from Time-Resolved Optical and X-ray Absorption Spectroscopy
- Jay, Raphael M. (author)
-
- Coates, Michael R., 1994- (author)
- Stockholms universitet,Fysikum
- Zhao, Huan (author)
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- Winghart, Marc-Oliver (author)
- Han, Peng (author)
- Wang, Ru-Pan (author)
- Harich, Jessica (author)
- Wikmark, Hampus (author)
- Fondell, Mattis (author)
- Nibbering, Erik T. J. (author)
- Huse, Nils (author)
- Wernet, Philippe (author)
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- (creator_code:org_t)
- English.
- Other publication (other academic/artistic)
Abstract
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- C-H bond activation reactions with transition metals typically proceed via the formation of alkane ?-complexes, where an alkane C-H ?-bond binds to the metal. Due to the weak nature of metal-alkane bonds, ?-complexes are challenging to characterize experimentally. Here, we photochemically prepare the model ?-complex Cr(CO)5-alkane from Cr(CO)6 in octane solution and characterize the nature of its metal-ligand bonding interactions. Using femtosecond optical absorption spectroscopy, we find photo-induced CO dissociation from Cr(CO)6 to occur within the 100 fs time-resolution of the experiment. Rapid geminate recombination by a fraction of molecules is found to occur with a time constant of 150 fs. The formation of bare Cr(CO)5 in its singlet ground state is followed by complexation of an octane molecule from solution with a time constant of 8.2 ps. Picosecond X-ray absorption spectroscopy at the Cr L-edge and O K-edge provides unique information on the electronic structure of the Cr(CO)5-alkane ?-complex both from the metal and ligand perspectives. We find substantial destabilization of the lowest unoccupied molecular orbital upon coordination of the C-H bond to the undercoordinated Cr center in the Cr(CO)5-alkane ?-complex, accompanied with rehybridization between metal and ligand orbitals. Our study demonstrates the value of combining optical and X-ray spectroscopic methods as complementary tools to study the properties of alkane ?-complexes as the decisive intermediates in C-H bond activation reactions.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- kemisk fysik
- Chemical Physics
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- vet (subject category)
- ovr (subject category)
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