Abstract
In the title compound, {[Au(C26H24P2S2)][AuBr2]} n , the gold(I) centres of the cation are coordinated by the P=S groups of the di-sulfide ligands to form a chain polymer parallel to the c axis. Both independent gold atoms lie on the same twofold axis, and the midpoint of the H2C-CH2 bond lies on an inversion centre. The anions flank the polymeric chain; they are connected to it by short aurophilic inter-actions and C-H⋯Br contacts, and to each other by Br⋯Br contacts.
Highlights
In the title compound, {[Au(C26H24P2S2)][AuBr2]}n, the gold(I) centres of the cation are coordinated by the P S groups of the disulfide ligands to form a chain polymer parallel to the c axis
Both independent gold atoms lie on the same twofold axis, and the midpoint of the H2C—CH2 bond lies on an inversion centre
Cationic 1:1 complexes of gold(I) with diphosphane disulfides can only be achieved if the ligand geometry allows for linear coordination at the gold atom, which is not generally the case unless suitable spacers, such as ferrocene units or other metal centres, are present (Gimeno et al, 2000, and references therein; Parkanyi & Besenyei, 2017; Wang & Fackler, 1990)
Summary
Phosphane sulfides are known to act as ligands towards gold(I) centres, not many complexes have been structurally characterized in which two such ligands coordinate to gold(I). In the course of our studies of phosphane chalcogenide complexes of gold (Upmann et al, 2019, and references therein) we planned to study complexes of the diphosphane disulfides 1,2-bis(diphenylphosphinothioyl)ethane [previously known as 1,2-bis(diphenylphosphino)ethane disulfide; dppeS2] and bis(diphenylthiophosphinoyl)methane [previously known as bis(diphenylphosphino)methane disulfide; dppmS2] with gold(I) halide fragments AuBr and AuCl, with particular attention to the mononuclear complexes. This succeeded to some extent; we were able to isolate and determine the structure of dppmS2AuCl, the isotypic dppmS2AuBr and its oxidation product with bromine [(dppmS2)AuBr2]+ [AuBr4]À (Jones et al, 2020a,b,c, respectively), but yields were. Two C—HÁ Á ÁBr contacts between cation and anions are sufficiently short and linear to be considered ‘weak’ hydrogen bonds (Table 2), and to contribute further cohesion to the structure, but are omitted from Fig. 2 for clarity
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