Other Substituents in Preformed Blocks

The coordination of metals to various other pendant sites present in block copolymers has also been explored. For example, metal coordination to the olefinic groups present in the polybutadiene blocks of polystyrene-fo-polybutadiene (PS-b-PB) diblock and PS-b-PB-b-PS triblock copolymers has been reported [102]. This was achieved by the reaction of the block copolymers with various metal complexes such as Fe3(CO)i2, [Rh(/t-Cl)(CO)2]2, PdCl2(NCMe)2, and PtCl2(NCMe)2 to 

The pendant phosphino groups of polystyrene-i)-poly(vinyltriphenylphosphine) (PS-b-PVTPP) have also been used to coordinate Pd salts [103]. Complex aggregation phenomena were observed in solution due to the possibility of intermolecular cross-linking reactions, and reduction with hydrazine or other reductants was shown to yield Pd nanoparticles. 

As a final example, the anionic sites generated from polyacrylic acid core-forming blocks within cross-linked micelles of triblock copolymers in water have also been used to bind Pd ions [104]. In this case, subsequent reduction with hydrazine yielded Pd nanopartides, which were shown to catalyze the hydrogenation of alkenes. 

Inorganic Materials, 2nd ed. (Eds. D.W. Bruce, D. 0 Hare), John Wiley Sons, Toronto, 1996. 

Unusual Properties, American Chemical Society, Adv. Chem Ser. 1976, 150, 46. 

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