A polymer-grafted metal cluster was synthesized by stirring an acetic acid solution of palladium(II) acetate and bipyridyl-terminated poly(oxyethylene) (bpy-POE) under 1 atm hydrogen at room temperature. The cluster became soluble in CH2Cl2, CHCl3, MeOH, acetone, and water. The 1H NMR spectrum of the cluster indicates that the terminal bipyridyl ligand was fixed at the surface of the palladium cluster. TEM investigation of the sample showed very narrow particle size distribution with a diameter of 3−5 nm.
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Naka et al. (1999) studied this question.
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