Solution structure and decomposition pathway of zwitterionic zirconium (IV) benzyl complexes
摘要:
Reaction of the chelating diamido complexes Zr(ABA(n))(CH2Ph)(2) [ABA(1) = N,N'-(SiMe3)(2)-2-amidobenzylamido, ABA(2) = N,N'-(SiMePh2)(SiMe3)-2-amidobenzylamido] with B(C6F5)(3) leads to formation of the unstable zwitterionic adducts [Zr(ABA(n))(CH2Ph)][(eta(6)-PhCH2)B(C6F5)(3)] 1 (n = 1) and 2 (n = 2), as shown by low temperature NMR experiments that, moreover, enabled an insight into the molecular structure of these compounds in solution. Two intermediates of the decomposition of 1 and 2, that leads to complexes Zr(ABA(n))(C6F5)(2), were identified. (C) 2002 Elsevier Science B.V. All rights reserved.