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Synthesis and chiroptical properties of a helical poly(phenylacetylene) bearing optically active pyrene pendants
Author(s) -
Lin Hongzhen,
Morino Kazuhide,
Yashima Eiji
Publication year - 2008
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20457
Subject(s) - phenylacetylene , chemistry , circular dichroism , cotton effect , chirality (physics) , monomer , pyrene , helix (gastropod) , polymer chemistry , polymerization , photochemistry , stereochemistry , crystallography , polymer , catalysis , organic chemistry , ecology , nambu–jona lasinio model , chiral symmetry breaking , physics , quantum mechanics , snail , biology , quark
A novel poly(phenylacetylene) derivative bearing optically active pyrene moieties as the pendant groups (poly‐( R )‐ 1 ) was prepared by the polymerization of the corresponding monomer ( R )‐ 1 in the presence of a rhodium catalyst, and its chiroptical property was investigated. Poly‐( R )‐ 1 exhibited an induced circular dichroism (ICD) in the polymer backbone region due to the predominantly one‐handed helical conformation. The ICD pattern dramatically changed and was accompanied by inversion of the Cotton effect sign in response to a change in the temperature and solvent, indicating that poly‐( R )‐ 1 underwent a helix–helix transition in response to the external stimuli. Chirality, 2008. © 2007 Wiley‐Liss, Inc.