title: Reactions of cerium atoms and dicerium molecules with CO: formation of cerium carbonyls and photoconversion to CO-activated insertion molecules.
abstract: Reactions of cerium with carbon monoxide molecules in solid argon have been studied using matrix isolation infrared absorption spectroscopy. The cerium carbonyls CeCO and Ce2CO are produced spontaneously on annealing and they are photochemically rearranged to the CCeO and c-Ce2(mu-C)(mu-O) isomers, where Ce and Ce2 are inserted into the CO triple bond. Theoretical calculations indicate that CeCO is an end-on-bonded carbonyl with a quintet ground state, whereas Ce2CO is a rare dinuclear lanthanide carbonyl complex with CO serving as an asymmetrically bridged, side-on ligand. The CCeO molecule was theoretically characterized to have a linear structure with a singlet ground state. Evidence is also presented for the CeCO- anion and other cerium carbonyls with higher coordination numbers.
authors.affiliation: Department of Chemistry & Laser Chemistry Institute, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, China.
authors.forename: Mingfei
authors.initials: M
authors.lastname: Zhou
authors.forename: Xi
authors.initials: X
authors.lastname: Jin
authors.forename: Jun
authors.initials: J
authors.lastname: Li
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D010777:Photochemistry; D012680:Sensitivity and Specificity; D013055:Spectrophotometry, Infrared / Q000379:methods
chemical_list: D002563:Cerium; D002248:Carbon Monoxide