Journal Highlight: Synthesis of novel blue-light-emitting polypyridine

Synthesis of novel blue-light-emitting polypyridine

Journal of Polymer Science Part A: Polymer Chemistry, 2012, 50, 1054-1061
Yutaka Nanashima, Akihiro Yokoyama, Tsutomu Yokozawa

Abstract: A new regioregular head-to-tail (HT)-type polypyridine with methoxyethoxyethoxy (MEEO) side chains, HT-PMEEOPy, was synthesized by means of Kumada-Tamao coupling polymerization of a Grignard monomer with a Ni catalyst. Although the polymer was precipitated in THF during polymerization, multiangle laser light scattering (MALLS) analysis indicated that the weight-average molecular weight (M_w) was about 25,000. The HT content in the polymer was 95%. A solution of HT-PMEEOPy in CHCl₃ was found to emit a strong blue light when the solution was irradiated with UV light; the UV-vis absorption maximum (lambda_max) and photoluminescence maximum (lambda_{max em}) were at 392 and 460 nm, respectively. To clarify the effect of regioregularity of PMEEOPy on the photoluminescence, head-to-head (HH) PMEEOPy was synthesized by means of Yamamoto coupling polymerization. The photoluminescence of HH-PMEEOPy (lambda_max = 330 nm, lambda_{max em} = 414 nm) was weaker than that of HT-PMEEOPy.

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