Calixarenes as aryloxides: oligonuclear europium(III) derivatives
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Synthetic and structural studies of europium complexes of calixarene, p-t-Bu-calixarene and p-t-Bu-calix-arene are reported. The complex [Eu2(calixarene-6H)(dmso)5] was found to have a similar structure topreviously reported p-t-Bu- and p-nitro-calixarene complexes of the lanthanides. Despite being prepared undersimilar conditions, the complex of p-t-Bu-calixarene was found to be a tetranuclear assembly, formulated as[(HO)2(OCO2)Eu4(p-t-Bu-calixarene-4H)2(dmso)6]. Expanding the ligand to p-t-Bu-calixarene resulted in theisolation of a larger oligonuclear assembly, [(HO)9(H2O)2Eu7(p-t-Bu-calixarene-6H)2(dmso)6]. In contrast to theconsistent structural type found with the calixarene system, however, use of a different solvent (acetone) gave riseto a much simpler species, [Eu2(p-t-Bu-calixarene-3H)2(dmso)4].
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