1994•Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystalsRequires access
Synthesis of Diacetylene-Substituted Polydiacetylenes with Alkoxycarbonylurethane Substtuents and Their Optical Properties
Hajime Kawanami, Shuji Okada, Hiro Matsuda, Takanori Doi, Naoto Kikuchi, Kikuko Hayamizu, Hidetoshi Oikaw, Hachiro Nakanishi
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Abstract
Octatetrayne monomers with urethane groups, i.e. R-C≡C-C≡C-C≡C-C≡C-R in which R˭‒(CH2)m-OCONH-CH2-COO-(CH2)n-H (5ECMU-4A: m=5, n=2; 3BCMU-4A: m=3, n=4), were synthesized, and their polymerization behavior and optical properties were investigated. The polymer structures were confirmed to be diacetylene-substituted polydiacetylenes like polymers from octatetraynes studied previously. Though both of thin film polymers obtained by γ-ray and UV irradiation showed excitonic absorption around 680 nm, absorbance of γ-ray irradiated one was three times larger than that of UV-irradiated one. Thus, it was found that UV-irradiation caused not only polymerization but also deterioration of the produced polymers, and γ-ray irradiation is superior to UV irradiation for polymerization. The third-order nonlinear optical susceptibilities (χ(3)(-3ω) s) of these polymers were (0.56–3.7)×10−11 esu, and roughly proportional relation between χ(3) s in three-photon resonant region and absorbance were found in this series of polymers.