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Fig. 2. Cation exchange (%) of [R4N]+ by [Cp2Co]+ determined by ICP-OES for [(Cp2Co)x(R4N)3–x][In3(BTC)4] (x = 3 corresponds to 100%). Conditions: 0.02 M solution of [Cp2Co][PF6] in acetone, initial ratio [R4N]+/[Cp2Co]+ = 1/1 or 3/1.