Synthesis and X-ray molecular structures of the silver(I) amides [{Ag[µ-N(SiMe3)2]}4] and [{Ag[µ-NCMe2(CH2)3CMe2]}4]

Abstract

The thermally stable silver(I) amides [{Ag(µ-NR₂)}₄](R = SiMe₃) 1 and [{Ag(µ-NR′₂)}₄][NR′₂= [graphic omitted]Me₂] 2, prepared from AgNCO and Sn(NR₂)₂ or Sn(NR′₂)₂, or for 1 also from M(NR₂)₂(M = Pb or Yb) or [{Sn(µ-F)NR₂}₂], are centrosymmetric, tetranuclear clusters comprising a square of Ag atoms [mean Ag⋯Ag 3.001(2)Å for 1 and 2.995(2)Å for 2] linked by singly bridging amido groups [mean Ag–N 2.148(5)Å for 1 and ranging from 2.126(7) to 2.184(7)Å for 2], the (AgN)₄ macrocycle being planar for 1 but puckered for 2, and the N–Ag–N′ and Ag–N–Ag′ arrangements being essentially linear and rectangular, respectively.