The selective substitution of the antipodal F atom in 1-Me-CB(11)F(11)- with a SiPh(3) moiety led to the isolation and structure determination of the cesium(I) and silver(I) salts of the 1-Me-12-SiPh(3)-CB(11)F(10)- anion. The silver salt contains both a nearly trigonal-planar Ag(arene)(3)+ cation and the first example of a Ag(arene)(4)+ cation.
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