Systematic assembly of the double molecular boxes: {Cs⊂[CpCo(CN)3]4[Cp*Ru]3} as a tridentate ligand

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FONTE

National Academy of Sciences

RESUMO

Cubic cage compounds composed of Co-CN-Ru linkages have been prepared which illustrate the following features: (i) new motifs for alkali metal ion complexation (i.e., cationic receptors for cations), (ii) a new family of triaza-metalloligands, and (iii) a double box-like cage. The cages are synthesized by the condensation of [CpCo(CN)3]− and [Cp*Ru(NCMe)3]+ (cyclopentadienyl, Cp; pentamethylcyclopentadienyl, Cp*) the presence of Cs+. The species {Cs⊂{[CpCo(CN)3]4[Cp*Ru]4}+ and {Cs⊂{[CpCo(CN)3]4[Cp*Ru]3[Cp*Rh]}2+ illustrate the box-completion reaction Cs ⊂ Co4Ru3 + M (M = Cp*Rh2+, Cp*Ru+). With the naked ion precursors [Na(NCMe)6]+ and [Fe(NCMe)6]2+, the box-completion reactions afforded {Na{Cs⊂[CpCo(CN)3]4[Cp*Ru]3]}2}+ and {Fe{Cs⊂ [CpCo(CN)3]4[Cp*Ru]3]}2}2+. These cages provide the first examples, to our knowledge, of the double-box motif.

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