Core expansion of bis-calixarene-supported clusters†
Calixarenes are excellent ligand supports for the synthesis of polymetallic clusters of transition and lanthanide metal ions, as well as 3d–4f ion mixtures. Bis-calixarene, a recent addition to the calixarene family, forms structurally related cages that mirror the metal ion binding preferences of calixarene. Here we show that stoichiometric control causes remarkable expansion in the cores of two known bis-calixarene-supported clusters, with concomitant changes to the magnetic properties observed.
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