A Comparative Study of Polymer Composition, Molecular Weight, and Counterfoil Effects on the Chelation of Bipyridine Macroligands to Iron(II)

摘要

Labile iron(II) tris(bipyridine)-centered star polymers are responsive materials. Bpy-centered macroligands based on polystyrene, poly(methyl methacrylate), poly(e-caprolactone), poly(DL-lactic acid)) of different molecular weights were combined with FeX_2 salts (X~- = I~-, Br~-, CClO_4~-, BF_4~-) in 3:1 CH_2Cl_2:CH_3OH. Iron tris(bpy) centered star formation is facile for macroligands <15 kDa; however, both the rate and extent of chelation are polymer dependent and decrease with increasing molecular weight. Counterion ion (i.e. X~-) effects are minimal.