Synthese und Kristallstruktur von [l,3-Bis(4-ethoxyphenyl)triazenido]pyridino-silber(I), einem dimeren Komplex mit kurzem Silber-Silber-Kontakt / Synthesis and Crystal Structure of [1,3-Bis(4-ethoxyphenyl)triazenido]pyridino Silver(I), a Dimeric Complex with a Short Silver-Silver Contact

Abstract

1,3-Bis(4-ethoxyphenyl)triazenido silver(I) (1) is obtained from equimolar amounts of the triazenido anion and AgNO3 in THF/CH3CN. 1 forms in pyridine the dimer [Ag(EtOC6H4NNNC6H4OEt)·py]2 (2) which crystallizes as yellow pyridine solvate 2·2 py in the monoclinic space group P21/n and a = 1067.1(7), b = 1764.5(9), c = 1373.0(9) pm, β = 106.46(7)°, Z = 2. In the centrosymmetric dimer 2, two triazenido ligands bridge two Ag(I) atoms with their atoms N1 and N3 forming an eight-membered heterocycle Ag2N6 with a short Ag-Ag interaction of 272.6 pm. To each Ag atom an additional pyridine ligand is weakly coordinated with a distance Ag-N40 = 245.5 pm. The bond axis N1 - Ag-N3′ within the heterocycle is not linear (158.5°). The Ag-N distances to the N-atoms of the triazenido ligand are 217.6 and 218.5 pm.