Analytical ultracentrifugation studies on terpyridine-end-functionalized poly(ethylene oxide) and polystyrene systems complexed via Ru(II) ions

In this paper we study the solution properties of several metallo-supramolecular assem- blies containing polystyrene (PS) and poly(ethylene oxide) (PEO) blocks linked via Ru 2+ ions: PS20 −( Ru 2+ )− PEO70, PS20 −( Ru 2+ )− PS20 ,a nd PEO225 −( Ru 2+ )− PEO225 .S edi- mentation equilibrium measurements were performed to determine the molar mass distribution and state of association, and the sedimentation velocity measurements were used to obtain the molar mass distribution, sedimentation coefficient distri- bution, their average values, and average diffusion coefficient. The results obtained from the two types of experiments are compared and discussed.