Strukturell unterschiedliche Metallamide (Li, Cu, Ag, Cd) mit dem Chelatliganden [tBu-N-SiMe2-O-C6H4-O-SiMe2-N-tBu]2-

Abstract

The amino hydrogen atoms in the silylamine o-C6H4O2(Me2SiN(H)tBu)2 (1) can be replaced by monovalent (Li, Cu, Ag) or divalent (Cd) metallic elements. Whereas the lithium compound is obtained as an ether adduct, [C6H4O2(Me2SiNtBu)2]Li2 . 2 OEt2 (2), the copper and silver compounds are solvens-free. The latter two form similar dimers comprising four metal atoms: [C6H4O2(Me2SiNtBu)2]2Cu4 (3) and [C6H4O2(Me2SiNtBu)2]2Ag4 (4). The cadmium compound is also a dimer with two ligands and two cadmium atoms making up the molecule, [C6H4O2(Me2SiNtBu)2]2Cd2 (5). X-ray structure analyses reveal that in all compounds the metallic elements are highly coordinated by N and O interactions, with coordination numbers of 4 (2, 3, 4) and 5 (5). The oxygen contacts are quite long ranging from 260 to 301 pm. In the Cu und Ag compounds quadratic planar arrangements at the metals are found (bridged by nitrogen) with distances Cu-Cu 262.6(2) - 270.1(2) and Ag-Ag 291.7(1) - 301.8(2) pm.