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Issue 17, 2003
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Calixarenes as aryloxides: oligonuclear europium(III) derivatives

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Synthetic and structural studies of europium complexes of calix[8]arene, p-t-Bu-calix[7]arene and p-t-Bu-calix[9]arene are reported. The complex [Eu2(calix[8]arene-6H)(dmso)5] was found to have a similar structure to previously reported p-t-Bu- and p-nitro-calix[8]arene complexes of the lanthanides. Despite being prepared under similar conditions, the complex of p-t-Bu-calix[7]arene was found to be a tetranuclear assembly, formulated as [(HO)2(OCO2)Eu4(p-t-Bu-calix[7]arene-4H)2(dmso)6]. Expanding the ligand to p-t-Bu-calix[9]arene resulted in the isolation of a larger oligonuclear assembly, [(HO)9(H2O)2Eu7(p-t-Bu-calix[9]arene-6H)2(dmso)6]. In contrast to the consistent structural type found with the calix[8]arene system, however, use of a different solvent (acetone) gave rise to a much simpler species, [Eu2(p-t-Bu-calix[9]arene-3H)2(dmso)4].

Graphical abstract: Calixarenes as aryloxides: oligonuclear europium(iii) derivatives

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Publication details

The article was received on 06 May 2003, accepted on 30 Jun 2003 and first published on 18 Jul 2003

Article type: Paper
DOI: 10.1039/B305041F
Citation: Dalton Trans., 2003,0, 3319-3327
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    Calixarenes as aryloxides: oligonuclear europium(III) derivatives

    S. Fleming, C. D. Gutsche, J. M. Harrowfield, M. I. Ogden, B. W. Skelton, D. F. Stewart and A. H. White, Dalton Trans., 2003, 0, 3319
    DOI: 10.1039/B305041F

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