Synthese und Kristallstruktur von tetramerem N,N'-Diphenylformamidinato-gold(I), [Au(PhNCH NPh)]4/Synthesis and Structure of Tetrameric N,N'-Diphenylformamidinato Gold(I), [Au(PhNCHNPh)]4

Abstract

Abstract N.N'-Diphenylformamidinato gold(I) (1) is obtained from Na(PhNCH NPh) and Aul in liquid ammonia. It can be recrystallized from toluene/n-heptane to form colorless monoclinic crystals, the space group C 2/c, with the lattice constants a = 1781.7(7), b = 1159.0(5), c = 2518.7(8) pm, β = 99.06(3)°. 1 is tetrameric in solution and in the solid state. In the tetrameric complex with the symmetry C2 the four Au atoms form a planar rhombus with Au -Au distances between 295,7 and 322.7 pm. The amidinato ligands are arranged alternatively above and below the Au4-rhombus and function as bridging ligands for neighbouring Au atoms, which thereby reach a linear coordination with distances A u -N between 200.0 and 202.4 pm.