title: The structure of metallomicelles.
abstract: 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 Cu(II) 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.
authors.affiliation: Department of Chemistry, Cardiff University, PO Box 912, Cardiff CF10 3TB, UK.
authors.forename: P C
authors.initials: PC
authors.lastname: Griffiths
authors.forename: I A
authors.initials: IA
authors.lastname: Fallis
authors.forename: D J
authors.initials: DJ
authors.lastname: Willock
authors.forename: A
authors.initials: A
authors.lastname: Paul
authors.forename: C L
authors.initials: CL
authors.lastname: Barrie
authors.forename: P M
authors.initials: PM
authors.lastname: Griffiths
authors.forename: G M
authors.initials: GM
authors.lastname: Williams
authors.forename: S M
authors.initials: SM
authors.lastname: King
authors.forename: R K
authors.initials: RK
authors.lastname: Heenan
authors.forename: Richard
authors.initials: R
authors.lastname: Görgl