Abstract
AbstractSummary: pXPAs were stereospecifically polymerized using [Rh(nbd)Cl]2 as catalyst in the presence of a mixed solvent, i.e., ethanol and triethylamine, at 20 °C. The resulting PpXPAs were characterized in detail in order to predict geometrical structures concerning cis and trans configurations in the main‐chain CC bonds using 1H NMR, laser Raman, XRD, and ESR methods. The data showed that the PpXPAs have an extremely high content of the cis‐transoid form. Immobile unpaired electrons, ca. 1.2–3.1 × 1017 spins · g−1, called the cis radicals, were found to be stabilized even in the pristine cis PpXPAs. The observed g values of the pristine PpXPAs could be correlated with the spin‐orbit coupling constant ζ of the halogen atom at the para position of the phenyl.Second derivative ESR spectra of PpIPA observed (a) before and (b) after compression, and the suggested respective structures.magnified imageSecond derivative ESR spectra of PpIPA observed (a) before and (b) after compression, and the suggested respective structures.
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