Abstract
Calix[4]arenes are extremely versatile ligands that are capable of supporting the formation of a wide variety of polymetallic clusters of paramagnetic metal ions. One can exert influence over cluster formation through alteration of the calix[4]arene framework and subsequent ‘expansion’ of the lower-rim polyphenolic binding site. The present contribution investigates cluster formation with calix[4]arenes substituted at all four methylene bridge positions with furan moieties. Two known cluster types have been isolated with this ligand, the structures of which lend insight into factors that may ultimately preclude the formation of mixed-metal species.
Highlights
The ability to influence the formation of paramagnetic metal ion clusters from multicomponent systems is a challenging synthetic goal that holds great potential when considering the possibility to control or fine tune physical properties such as molecular magnetism (1-5)
We have found that methylene-bridged calix[4]arenes, are remarkably versatile ligands for cluster synthesis under ambient conditions, affording a wide range of structural topologies as a result (6-12)
The C[4]s bridge to the body ions and [MnIII(C[4])]- moieties in the structure can be considered as capping units; these structure capping moieties, the nature of which depends on the metal ions present, are found in every C[4]-supported cluster we have reported to date
Summary
Exploratory studies into 3d/4f cluster formation with fully bridgesubstituted calix[4]arenes Angela Fong, Laura McCormick, Simon J. Atwood on the occasion of his 75th birthday. Exploratory studies into 3d/4f cluster formation with fully bridgesubstituted calix[4]arenes. Calix[4]arenes are extremely versatile ligands that are capable of supporting the formation of a wide variety of polymetallic clusters of paramagnetic metal ions. One can exert influence over cluster formation through alteration of the calix[4]arene framework and subsequent ‘expansion’ of the lower-rim polyphenolic binding site. The present contribution investigates cluster formation with calix[4]arenes substituted at all four methylene bridge positions with furan moieties. Two known cluster types have been isolated with this ligand, the structures of which lend insight into factors that may preclude the formation of mixed-metal species
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