X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids
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 confirm...
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Elsevier
2016
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| Online Access: | https://eprints.nottingham.ac.uk/45497/ |
| _version_ | 1848797143445274624 |
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| author | Men, Shuan Lovelock, Kevin Licence, Peter |
| author_facet | Men, Shuan Lovelock, Kevin Licence, Peter |
| author_sort | Men, Shuan |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:59:11Z |
| format | Article |
| id | nottingham-45497 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:59:11Z |
| publishDate | 2016 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-454972020-05-04T17:35:07Z https://eprints.nottingham.ac.uk/45497/ X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids Men, Shuan Lovelock, Kevin Licence, Peter 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. Elsevier 2016-02-28 Article PeerReviewed Men, Shuan, Lovelock, Kevin and Licence, Peter (2016) X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids. Chemical Physics Letters (645). pp. 53-58. ISSN 0009-2614 Ionic liquids Phosphine ligands Rhodium atom Biphosphine ligand Chelated diphosphine rhodium complex http://www.sciencedirect.com/science/article/pii/S0009261415009483?via%3Dihub doi:10.1016/j.cplett.2015.12.017 doi:10.1016/j.cplett.2015.12.017 |
| spellingShingle | Ionic liquids Phosphine ligands Rhodium atom Biphosphine ligand Chelated diphosphine rhodium complex Men, Shuan Lovelock, Kevin Licence, Peter X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title | X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title_full | X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title_fullStr | X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title_full_unstemmed | X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title_short | X-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| title_sort | x-ray photoelectron spectroscopy as a probe of rhodium-ligand interaction in ionic liquids |
| topic | Ionic liquids Phosphine ligands Rhodium atom Biphosphine ligand Chelated diphosphine rhodium complex |
| url | https://eprints.nottingham.ac.uk/45497/ https://eprints.nottingham.ac.uk/45497/ https://eprints.nottingham.ac.uk/45497/ |