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Two- and Three-Dimensional Smectic Ordering of Single-Handed Helical Polymers

2007; American Chemical Society; Volume: 130; Issue: 1 Linguagem: Inglês

10.1021/ja074627u

1943-2984

Hisanari Onouchi, Kento Okoshi, Takashi Kajitani, Shinichiro Sakurai, Kanji Nagai, Jiro Kumaki, Kiyotaka Onitsuka, Eiji Yashima,

Synthesis and Properties of Aromatic Compounds

Rodlike polymers with precisely defined architectures are ideal building blocks for self-assembled structures leading to novel nanometer-scale devices. We found that the living polymerization of a single isocyanide enantiomer bearing an l-alanine pendant with a long n-decyl chain simultaneously produced diastereomeric right- and left-handed helices with different molecular weights and narrow molecular weight distributions. Each single-handed, rodlike helical polymer with a controlled length and handedness isolated by a facile solvent fractionation method with acetone self-assembled to form well-defined two- and three-dimensional smectic ordering on the nanometer scale on a substrate and in a liquid crystalline state as evidenced by direct atomic force microscopic observations and X-ray diffraction measurements, respectively.