Formation of Very Weakly Interacting Organometallic Cation−Anion Systems Using Pearson's HSAB Concept:  Synthesis and Structures of [Ag(Toluene)3]+ [{((SiMe3)3C)2Al2F5}2Li]- and [AlF2(THF)4]+ [{(SiMe3)3C}2Al2F5]-

By using Pearson's HSAB principle [Ag(Toluene)3]+ [{((SiMe3)3C)2Al2F5}2Li]- (2) has been synthesized from the reaction of [(SiMe3)3CAlF2]3 (1) with AgF and LiCl. Reaction of 1 with AgF2 and NH4F affords [AlF2(THF)4]+ [{(SiMe3)3C}2Al2F5]- (3) and [NH4]+ [(SiMe3)3CAlF3]- (4) , respectively. 2 and 3 have been structurally characterized.