2016/04/21 by Qingnan Zhang, Shu‐Xian Hu, Hui Qu +6 · 91 citations
Materials Science · Chemical Engineering · Chemistry · #Catalytic Processes in Materials Science #Catalysis and Oxidation Reactions #Radioactive element chemistry and processing #Lanthanide #Praseodymium #Oxidation state #Chemistry #Valence (chemistry) #Actinide #Inorganic chemistry #Oxide #Characterization (materials science) #Physical chemistry #Infrared spectroscopy #Materials science #Nanotechnology #Catalysis #Ion #Organic chemistry
paper · doi:10.1002/anie.201602196
published in Angewandte Chemie International Edition 55(24), 6896-6900 (Wiley)
openalex publication_date 2016/04/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The chemistry of lanthanides (Ln=La-Lu) is dominated by the low-valent +3 or +2 oxidation state because of the chemical inertness of the valence 4f electrons. The highest known oxidation state of the whole lanthanide series is +4 for Ce, Pr, Nd, Tb, and Dy. We report the formation of the lanthanide oxide species PrO4 and PrO2 (+) complexes in the gas phase and in a solid noble-gas matrix. Combined infrared spectroscopic and advanced quantum chemistry studies show that these species have the unprecedented Pr(V) oxidation state, thus demonstrating that the pentavalent state is viable for lanthanide elements in a suitable coordination environment.