Tetrasulphur tetraimide complexes of silver(I)

Abstract

Three new tetrasulphur tetraimide complexes of silver(I), Ag[ClO₄]·S₄N₄H₄(1), 2Ag[ClO₄]·S₄N₄H₄(2), and Ag[ClO₄]·2S₄N₄H₄(3), have been prepared and characterised. The mass spectra of (1) and (3) show the presence of [S₄N₄H₄]⁺ species in the fragmentation pattern. Conductimetric evidence shows that the species are complex salts, [Ag_m(H₄N₄S₄)_n][ClO₄]_m(n= 1, m= 1 or 2; n= 2, m= 1), in solution. The ¹H n.m.r. spectra suggest metal ion–S₄N₄H₄ ring π complexation, and the i.r. spectra give evidence for the existence of bidentate perchlorate bridging, –OCl(O₂)O–, between the silver nuclei in the solid state.