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 Title: Ce-PROMOTED BOND ACTIVATION OF ETHYLENE PROBED BY MASS-ANALYZED THRESHOLD IONIZATION SPECTROSCOPY Author(s): Zhang, Yuchen Contributor(s): Yang, Dong-Sheng; Cao, Wenjin; Kumari, Sudesh Subject(s): Ions Abstract: chem{Ce(C_2H_2)} and chem{Ce(C_4H_6)} complexes were observed in the reaction of Ce atom with ethylene in a supersonic molecular beam source and investigated by mass-analyzed threshold ionization spectroscopy (MATI) and theoretical calculations. Preliminary data analysis shows that chem{Ce(C_2H_2)} has a triangle structure (C$_{2v}$) with Ce binding to chem{C_2H_2} in a two-fold mode and chem{Ce(C_4H_6)} has a five-membered metallacyclic structure (C$_{s}$) with Ce binding to the two terminal carbon atoms of butadiene. The ground states of both species are triplets with a 4f$^{1}$6s$^{1}$ Ce-based electron configuration and those of the corresponding ions are doublets from the removal of the 6s$^{1}$ electron. The chem{Ce(C_2H_2)} complex is formed by ethylene dehydrogenation, whereas chem{Ce(C_4H_6)} by ethylene dehydrogenation and carbon-carbon bond coupling. The MATI spectra of chem{Ce(C_2H_2)} and chem{Ce(C_4H_6)} are rather similar to those of the corresponding La complexes previously observed by our group, except that the spectra of the Ce complexes exhibit two electronic transitions with almost identical vibrational intervals. This observation suggests that the existence of a 4f electron results in an increased complexity of the electronic spectra and states of the lanthanide hydrocarbons. Issue Date: 22-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79133 Date Available in IDEALS: 2016-01-05
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