Small-angle neutron scattering has been used to determine the structure of micelles formed in aqueous solutions of [Ru(bipy)2(bipy′)][Cl]2 complexes where (bipy′) ) 5,5′-dialkyl-2,2′-bipyridine. Surfactants with alkyl chains with carbon numbers of n ) 12, 15, and 19 have been studied for which both alkyl chains on each molecule have the same chain length. For n ) 12 the micelle shape is an oblate ellipsoid with the ratio of the minor-to-major axis radii being X ∼ 0.5, for reasonably low concentrations (c e 10cmc). For surfactants with n ) 15 and n ) 19, at concentrations c e 10cmc, the micelle shape is approximately spherical with X ∼ 1.

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The synthesis, solution and mesophase behaviour are described of some surfactant complexes of cobalt(III) containing triethylenetetramine (trien) and long-chain bipyridine ligands.