A Weak Interaction between Iron and Uranium in Uranium Alkyl Complexes Supported by Ferrocene Diamide Ligands
摘要:
Alkyl complexes of uranium supported by ferrocene diamide ligands are described along with the corresponding cationic species. Synthesis of uranium dialkyl compounds fc(NSiBuMe2)(2)UR2 [R = Np (neo-pentyl), Bz (benzyl)] was accomplished by salt metathesis between fc(NSiBuMe2)(2)UI2(THF) and neo-pentyl lithium or benzyl potassium. Protonation of one alkyl ligand led to the isolation of a cationic uranium alkyl complex. DFT calculations and X-ray crystallography data support the existence of a donor-acceptor, weak interaction between iron and uranium.
Molecular quadrangle formation from a diuranium μ-η6,η6-toluene complex
作者:Marisa J. Monreal、Saeed I. Khan、Jaqueline L. Kiplinger、Paula L. Diaconescu
DOI:10.1039/c1cc12367j
日期:——
A new invertedsandwich of a mu-eta(6),eta(6)-toluene diuraniumcomplex reacted with quinoxaline to form a tetranuclear macrocycle with ferrocene diamide uranium(IV) vertices and reduced quinoxaline edges.
Investigation of the Electronic Structure of Mono(1,1′-Diamidoferrocene) Uranium(IV) Complexes
作者:Selma Duhović、Jeremy V. Oria、Samuel O. Odoh、Georg Schreckenbach、Enrique R. Batista、Paula L. Diaconescu
DOI:10.1021/om400521k
日期:2013.10.28
The electronic structure of several mono(1,1'-diamidoferrocene) uranium complexes (NNR)UX2 (NNR = fc(NR)(2), fc = 1,1'-ferrocenediyl, R = SiMe3, (SiBuMe2)-Bu-t, SiMe2Ph, X = I, CH2Ph), (NNTBS)UI(OAr) (OAr = 2,6-di-tert-butylphenoxide), and (NNTBS)U(CH2Ph)(OAr) was investigated by electrochemistry, electronic absorption and vibrational spectroscopy, and DFT calculations. Similar metrical parameters were observed for (NNTBS)U(CH2Ph)(2) and (NNDMP)U(CH2Ph)(2) (and also for the previously reported (NNTBS)UI2(THF), (NNTBS)UI2(THF), and (NNTBS)U(CH2Ph)(OAr)) that translate in similar DFT parameters (bond orders, metal charges) despite some small differences observed by electrochemistry and IR or electronic absorption spectroscopy.