01877nas a2200241   4500008004100000022001400041245010600055210006900161260000800230300001600238490000700254520106200261653002301323653002301346653002001369653002201389653001401411100001701425700002401442700002001466700002201486856012701508       2021                        eng d  a1433-785100aStabilization of the elusive antimony(I) cation and its coordination complexes with transition metals0 aStabilization of the elusive antimonyI cation and its coordinati  cNOV  a25522-255290 v603 aUpon stabilization by 5,6-bis(diisopropylphosphino)acenaphthene to form compound 1, the fugitive antimony (I) cation exhibited nucleophilic behavior towards coinage metals. Compound 1 was strategically synthesized at room temperature from SbCl3, the bis(phosphine), and trimethylsilyl trifluoromethanesulfonate taken in a 1:2:3 ratio, whereby the bis(phosphine) plays the dual role of a reductant and a supporting ligand. The generation of 1 involves two-electron oxidation of the ligand to form a P-P bonded diphosphonium dication. Compound 1 was separated from this dication to give both products in pure form in moderate yields. Despite the overall positive charge, the Sb-I site in 1 was found to bind to metal centers, forming complexes with Au-I, Ag-I and Cu-I. Compound 1 reduced Cu-II to Cu-I and formed a coordination complex with the resulting Cu-I species. The effects of the electron-rich bis(phosphine) and the constrained peri geometry in stabilizing and enhancing the nucleophilicity of 1 have been rationalized through computational studies.10aantimony(I) cation10acoordination modes10anucleophilicity10aphosphine ligands10areduction1 aKumar, Vikas1 aGonnade, Rajesh, G.1 aYildiz, Cem, B.1 aMajumdar, Moumita  uhttps://library.ncl.res.in/content/stabilization-elusive-antimonyi-cation-and-its-coordination-complexes-transition-metals