The microstructure of GILCH-polymerized PPVs was examined by NMR techniques. Selectively main-chain 13 C-labeled polymers were prepared and investigated by 1 H NMR, 13 C NMR, and 2D NMR methods. Only one major polymerization defect was discovered: tolane−bisbenzyl (TBB) moieties could be proven in amounts of 1.5−2.2% for OC 1 C 10 −PPV. Furthermore, indications for ether-type end groups (∼0.2%) were found. These defects are readily explained by the polymerization mechanism. Other structural elements (e.g., cis double bonds, branching) were not detected.
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Becker et al. (1999) studied this question.
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