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X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids

Men, Shuan; Lovelock, Kevin; Licence, Peter

Authors

Shuan Men menshuang@hotmail.com

Kevin Lovelock kevin.lovelock@chem.ox.ac.uk



Abstract

We use X-ray photoelectron spectroscopy (XPS) to identify the interaction between the rhodium atom and phosphine ligands in six 1-octyl-3-methylimidazolium-based ionic liquids ([C8C1Im][X]). The formation of a mono-phosphine rhodium complex based upon addition of triphenylphosphine (PPh3) is confirmed by XPS in all ionic liquids studied herein. Due to the electron donation effect of the ligand, the rhodium atom becomes more negatively charged and thus exhibits a lower measured binding energy. The influence of the anion basicity on the formation of different types of rhodium complexes is also investigated. By introducing a biphosphine ligand, a chelated diphosphine rhodium complex is formed in ionic liquids with more basic anions and verified by both XPS and Infrared Spectroscopy (IR). The measured Rh 3d binding energies are correlated to the reaction selectivity of a hydroformylation reaction which inspires a method to design a metal catalyst to control the chemical reaction towards desired products in the future.

Journal Article Type Article
Publication Date Feb 28, 2016
Journal Chemical Physics Letters
Print ISSN 0009-2614
Electronic ISSN 0009-2614
Publisher Elsevier
Peer Reviewed Peer Reviewed
Issue 645
APA6 Citation Men, S., Lovelock, K., & Licence, P. (2016). X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids. Chemical Physics Letters, https://doi.org/10.1016/j.cplett.2015.12.017
DOI https://doi.org/10.1016/j.cplett.2015.12.017
Keywords Ionic liquids, Phosphine ligands, Rhodium atom, Biphosphine ligand, Chelated diphosphine rhodium complex
Publisher URL http://www.sciencedirect.com/science/article/pii/S0009261415009483?via%3Dihub
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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