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Abstract: Calixarenes are versatile ligands that, whilst also serving other purposes, can act as platforms for the synthesis of a wide range of 3d, 4f and 3d–4f polymetallic clusters. The empirical metal ion binding rules established for calixarene are closely mirrored by bis–calixarene, a relatively new ligand in which two equivalents of the former are directly tethered at a methylene bridge position. The direct tethering within bis-calixarene gives rise to some structural features that are related to calixarene coordination chemistry, but the prevailing clusters have fascinating new topologies and coordination behaviors. Here we present the synthesis of a family of new bis-calixarene-supported 3d–4f clusters, as well as their structural characterization and magnetic properties. Comparison is drawn with calixarene coordination chemistry, showing logical extension of common structural fragments and cluster capping behaviors upon moving to bis-calixarene. This approach therefore holds great potential for tuning cluster formation and composition at a high level through subsequent ligand alteration.
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- 1 Finished
1/08/11 → 31/07/14