Metal-carbon bonding in early lanthanide substituted cyclopentadienyl complexes probed by pulsed EPR spectroscopy.

ABSTRACT: We examine lanthanide (Ln)-ligand bonding in a family of early Ln³⁺ complexes [Ln(Cp^tt)₃] (1-Ln, Ln = La, Ce, Nd, Sm; Cp^tt = C₅H₃^tBu₂-1,3) by pulsed electron paramagnetic resonance (EPR) methods, and provide the first characterization of 1-La and 1-Nd by single crystal XRD, multinuclear NMR, IR and UV/Vis/NIR spectroscopy. We measure electron spin T₁ and T_m relaxation times of 12 and 0.2 μs (1-Nd), 89 and 1 μs (1-Ce) and 150 and 1.7 μs (1-Sm), respectively, at 5 K: the T₁ relaxation of 1-Nd is more than 10² times faster than its valence isoelectronic uranium analogue. ¹³C and ¹H hyperfine sublevel correlation (

SUBMITTER: Nodaraki LE 

PROVIDER: S-EPMC10882510 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature