Formation of the Imide [Ta(NMe2)(3)(mu-NSiMe3)](2) through an Unprecedented alpha-SiMe3 Abstraction by an Amide Ligand

Sharma B; Chen SJ; Abbott JKC; Chen XT; Xue ZL

Inorganic Chemistry, Vol.51, No.1, 25-27, 2012

DOI10.1021/ic2021676 Export Citation

Formation of the Imide [Ta(NMe2)(3)(mu-NSiMe3)](2) through an Unprecedented alpha-SiMe3 Abstraction by an Amide Ligand

Sharma B, Chen SJ, Abbott JKC, Chen XT, Xue ZL

Ta(NMe2)(4)[N(SiMe3)(2)] (1) undergoes the elimination of Me3Si-NMe2 (2), converting the -N-(SiMe3)(2) ligand to the = NSiMe3 ligand, to give the imide "Ta(NMe2)(3)(=NSiMe3)" (3) observed as its dimer 4. CyN=C=NCy captures 3 to yield guanidinates Ta-(NMe2)(3-n)(=NSiMe3)[CyNC(NMe2)NCy](n) [n = 1 (5), 2 (6)]. The kinetic study of alpha-SiMe3 abstraction in 1 gives Delta H-double dagger = 21.3(1.0) kcal/mol and Delta S-double dagger = 17(2) eu.