Synthesis, chemistry, and spectroscopy of some tris(pentahapto-cyclopentadienyl)uranium(IV) alkyl and aryl compounds

Computational Study on Mössbauer Isomer Shifts of Some Organic-neptunium (IV) Complexes

“…The calculated IR frequencies for X = Ph complex are shown in Table 3b. It was confirmed by the vector analysis of normal vibration modes that the vibrational frequencies of 1200-1300 and 1400-1600 cm -1 are assigned to the vibrations attributed to Ph -ligand, being consistent with the corresponding experimental frequencies [29] (Table 3b). Because stretching vibration frequency of aromatic C=C bond is in this region, Ph -ligand in complex remains to have an aromaticity.…”

Synthesis and CO2 Insertion Reactivity of Allyluranium Metallocene Complexes

“…The terminal η 3 -allyl protons were not observed in previously reported U[η 3 -CH 2 C(R)CH 2 ] complexes, and only the vinyl protons are observable in (C 5 H 5 ) 3 U(η 1 -CH 2 CHCH 2 ). 19 Protons on carbon atoms α to U 4+ are often not observed due to the paramagnetic nature of 5f 2 U 4+ . 40 For example, no resonances are observed for the α carbon protons in (η 5 -C 5 Me 4 SiMe 2 CH 2 -κC) 2 U, whereas they appear in derivatives in which a single atom has been inserted between the α carbons and the metal.…”

Actinide Organometallic Chemistry

“…Thus, it was three decades after the Manhattan Project studies before the first thermally stable actinide alkyls, aryls, alkenyls, and alkynyls (collectively called hydrocarbyls) were synthesized (Eq. 13) (17,34,35). In …”

“…The explanation appears to reside in the high coordinative saturation and congestion brought about by the three bulky, r-bonded cyclopentadienyl ligands (34). Evidence for this comes from the short intraligand nonbonded contacts found in x-ray diffraction studies and hindered rotation about the M-R bonds observed in spectroscopic work (34).…”