Synthese und Struktur von 1,3-Bis(4-trifluormethylphenyl)triazenido-Komplexen des Kupfer(I) und Silber(I) / Synthesis and Structure of 1,3-Bis(4-trifluormethylphenyl)triazenido Complexes of Copper(I) and Silver(I)

Abstract

[(F3CC6H4NNNC6H4CF3)Cu]4 (1) and [(F3CC6H4NNNC6H4CF3)Ag]n (2) are obtained by the addition of a solution of CuCl or AgNO, in CH3CN to a solution of Na(F3CC6H4NNNC6H4CF3) in THF. Recrystallization of 1 in toluene/n-hexane yields air-stable orange crystals (tetragonal space group P4̄21c, lattice constants a - 1527.7(5), c = 1281.3(4) pm, Z = 2). Complex 1 forms tetrameric units of symmetry S4 with the four Cu atoms forming a slightly folded rhombus. The triazenido ligands bridge the Cu atoms alternatingly above and below the rhombic Cu4 ring resulting in short Cu -Cu interactions of 257.9 pm. Complex 2 crystallizes from pyridine/methanol in form of yellow, air-stable crystals exhibiting a weak temperature independent paramagnetism of 0.64 B.M. per Ag atom at room temperature. The lattice constants are a = 2943(2), b = 475.8(5), c = 2280(1) pm. β = 111.99(6)°. Z = 8 for the monoclinic space group P21/c. The Ag atoms form zigzag chains with short Ag-Ag distances of 283.4 and 284.0 pm and angles Ag-Ag-Ag of 113.7 and 114.1°. The bridging triazenide ligands are arranged alternatingly above and below the Ag-Ag chain. Two symmetry independent zigzag chains are found in the unit cell.