作者:Ashley J. Wooles、William Lewis、Alexander J. Blake、Stephen T. Liddle
DOI:10.1021/om400435b
日期:2013.9.23
Treatment of [M(Bn)] (M = K, Cs) with [HCC(Bu-t)NDipp}C(Bu-t)-NHDipp}] ((LH)-H-But; Dipp = 2,6-diisopropylphenyl) afforded [K(L-But)(THF)(n)], 1, and [Cs(L-But)], 2, which were crystallized from hexane or benzene to afford [K(L-But)-(THF)(3)], 1a, and [Cs(L-But)}Cs(L-But)(eta(3)-C6D6))-C6D8](infinity), 2a, respectively. Complexes 1 and 2 were utilized in the preparation of the previously reported [U(L-But)Cl-3], which was cleanly converted to [U(L-But)I-3], 3, via reaction with an excess of Me3SiI. Attempts to prepare U(III) complexes incorporating the L-But ligand proved unsuccessful, but utilizing [HCC(Me)NDipp}(C(Me)NHDippl] ((LH)-H-Me) led to the isolation of [U(L-Me)(2)(THF)(2)], 4, via the reaction of [K(L-Me)] with [U(I)(3)(THF)(4)]. Complex 4 can be derivatized via reaction with [K(Cp*)] (Cp* = eta(5)-C5Me5) or [KN(SiMe3)(2)}] to afford [U(L-Me)(Cp*)I], 5, and [U(L-Me)N(SiMe3)(2)}I], 6, respectively. The reaction of 4 with two equivalents of [KN(SiMe3)(2)}] did not afford [U(L-Me)N(SiMe3)(2)}(2)] as expected, but instead led to the isolation of the U(IV) species [UHC[C(Me)NDipp]-[C(CH2)NDipp]}N(SiMe3)(2)}(2)], 7, via deprotonation of the L-Me ligand. The reduction of 4 with KC8 in benzene afforded the diuranium inverse sandwich complex [U(L-Me)I}(2)(mu-eta(6):eta(6)-C6H6)], 8, albeit in low yield. Complexes 1-8 have been characterized by single-crystal X-ray diffraction studies, by multielement NMR spectroscopy, and variously by FTIR spectroscopy, elemental analysis, UV/vis/NIR spectroscopy, and solution-state magnetic studies.