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The Structure of Metallomicelles

Griffiths, Peter Charles, Fallis, Ian Andrew ORCID:, Willock, David James ORCID:, Paul, Alison ORCID:, Barrie, C. L., Griffiths, P. M., Williams, Graham Mark, King, S. M., Heenan, Richard K. and Gorgl, R. 2004. The Structure of Metallomicelles. Chemistry - A European Journal 10 (8) , pp. 2022-2028. 10.1002/chem.200305670

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The morphology of micelles formed by two novel metallosurfactants has been studied by small-angle neutron scattering (SANS) and small-angle-X-ray scattering (SAXS). The two surfactants both contain a dodecyl chain as the hydrophobic moiety, but differ in the structure of the head group. The surfactants are CuII complexes of monopendant alcohol derivatives of a) the face-capping macrocycle 1,4,7-triazacyclanonane (tacn), and b) an analogue based upon the tetraazamacrocycle 1,4,7,10-tetraazacyclododecane. Here, neutron scattering has been used to study the overall size and shape of the surfactant micelles, in conjunction with X-ray scattering to locate the metal ions. For the 1,4,7,10-tetraazacyclododecane-based surfactant, oblate micelles are observed, which are smaller to the prolate micelles formed by the 1,4,7-triazacyclononane analogue. The X-ray scattering analysis shows that the metal ions are distributed throughout the polar head-group region, rather than at a well-defined radius; this is in good agreement with the SANS-derived dimensions of the micelle. Indeed, the same model for micelle morphology can be used to fit both the SANS and SAXS data.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Uncontrolled Keywords: aggregation; macrocyclic ligands; SANS; SAXS; surfactants
ISSN: 09476539
Last Modified: 01 Dec 2022 10:11

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