Synthesis and molecular structures of uranium and thorium diamidoamine complexes
摘要:
Treatment of UCl4 or ThCl4 with Li-2[Me3SiN{CH2CH2NSiMe3}(2)] affords the mono-diamidoamine complexes [M(Me-3-SiN{CH2CH2NSiMe3}(2))Cl-2(THF)] (M=U, Th), and also the bis-diamidoamine complexes [M(Me3SiN{CH2CH2NSiMe3}(2))(2)] (M = U, Th). The base-free complex [U(Me3SiN{CH2CH2NSiMe3}(2))Cl-2](2) was obtained by treatment of [U(Me3SiN{CH2CH2NSi-Me-3}(2))Cl-2(THF)] with hot toluene. The X-ray structures of [Th(Me3SiN{CH2CH2NSiMe3}(2))Cl-2(THF)] and [U(Me3SiN {CH2CH2NSiMe3}(2))Cl-2](2) reveal a distorted octahedral geometry, whereas [M(Me3SiN{CH2CH2NSiMe3}(2))(2)] (M=U, Th) display trigonal bipyramidal geometry at the metal centre and the amino group on one of the diamidoamine ligands is non-bonding. (C) 2002 Elsevier Science B.V. All rights reserved.