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Recent reports have described the placement of substituents onto R-diimine ligands and their effect on the ¦Ò-donating ability to Pd(II) and thus the Lewis acidity of the metal.26,27 In response, we carried out an investigation of the polymerization behavior of a series of Pd(II) R-diimine catalysts bearing substituents in the para-aryl position on the ligand aromatic rings.28 We discovered that this substitution was able to perturb the metal electronics in a regular manner, as evidenced by the remarkably linear correlation observed in the stretching frequencies of the corresponding carbonyl complexes. Furthermore, several trends were observed in the physical properties of the resulting polymers. The introduction of substituents of increasing electron-donating ability led to catalysts that afforded polymers of higher molecular weight, slightly reduced branching density, and a corresponding shift toward less dendritic polymer topologies. In the case of copolymerizations with methyl acrylate, a clear and pronounced trend of increasing acrylate incorporation ratio and overall tolerance to polar functionality was also observed over the range of substitution explored. |
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