Synthesis and crystal structure of a germanium(II) calix[6]arene containing unusual diamidosilyl ether groups

摘要

The reaction of Ge[N(SiMe3)(2)](2) with calix[6]arene furnishes a novel macrocyclic product having two divalent germanium atoms incorporated into a Ge2NO rhombus which contains a mu(2)-oxygen atom and a mu(2)-NH2 group. The crystal structure of the product indicates the presence of a conformationally rigid molecule where three of the six oxygen atoms of the calix[6]arene are bound to the germanium atoms while the remaining three have been converted into -OSiMe3 or unusual -OSi(H)(NH2)(2) groups. Spectral (H-1, C-13, and Si-29 NMR) data in solution are consistent with the solid-state structure and indicate the germanium calix[6]arene retains its structure in solution. (C) 2008 Elsevier Ltd. All rights reserved.