2026/01/30 by Vincent M. Groner, Iaroslav E. Gureev, Brennan S. Billow +2 · 1 voice
Chemistry · Medicine · #Boron Compounds in Chemistry #Organometallic Complex Synthesis and Catalysis #Radioactive element chemistry and processing
paper · doi:10.1021/acs.organomet.5c00457
openalex publication_date 2026/01/30 · openalex created_date 2026/02/01 · openalex updated_date 2026/06/14
Reaction of Cp*UI 2 (THF) 3 (Cp* = pentamethylcyclopentadienide; THF = tetrahydrofuran) with Na R3 TerNH ( R3 Ter = 2,6(2,4,6-R 3 C 6 H 2 ) 2 C 6 H 3; R = Me, Et, iPr) gave the U(III) monoiodide complexes Cp*( R3 TerNH)UI (R = Me, 1-Me; R = Et, 2-Et; R = iPr, 3-iPr ). These complexes contain a functionalizable iodide position which reacts favorably with NaBH 4 to give the κ 3 -borohydride complexes Cp*( R3 TerNH)U(H 3 BH) (R = Me, 4-Me; R = Et, 5-Et; R = iPr, 6-iPr ). All compounds were experimentally characterized by SC-XRD, 1 H and 11 B NMR spectroscopy as well as UV–vis–NIR and FTIR analyses. DFT calculations corroborate the experimental findings, confirming the 5f 3 U(III) configuration across the entire series and revealing an increased U 5f orbital contribution in the borohydride derivatives. All compounds exhibit small but non-negligible U(III)–(η 6 -arene) δ-back-bonding interactions arising from the unpaired 5f electrons. Calculated steric parameters show progressively greater shielding of the U(III) center with increasing bulk of the terphenyl substituents from Me to iPr.