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Nomura, Kotohiro,Fukuda, Hiroya,Katao, Shohei,Fujiki, Michiya,Kim, Hyun Joon,Kim, Dong-Hyun,Zhang, Shu Royal Society of Chemistry 2011 Dalton transactions Vol.40 No.31
<P>Various half-sandwich titanium complexes containing iminoimidazolidide ligands, CpTiCl<SUB>2</SUB>[1,3-R<SUB>2</SUB>(CH<SUB>2</SUB>N)<SUB>2</SUB>C?N] (1a–d) [R = Ph (a), 2,6-Me<SUB>2</SUB>C<SUB>6</SUB>H<SUB>3</SUB> (b), cyclohexyl (c), <SUP><I>t</I></SUP>Bu (d)], have been employed as the catalyst precursors for ethylene polymerisation, syndiospecific styrene polymerisation, and copolymerisation of ethylene with 1-hexene in the presence of MAO cocatalyst; 1d showed the highest catalytic activity for ethylene polymerisation whereas 1b showed the highest activity for syndiospecific styrene polymerisation.</P> <P>Graphic Abstract</P><P>Effect of ligand substituents in ethylene polymerisation, syndiospecific styrene polymerisation, and ethylene/1-hexene copolymerisation using half-sandwich titanium complexes containing iminoimidazolidide ligands–MAO catalysts have been explored. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt10467e'> </P>
Solvent-to-Polymer Chirality Transfer in Intramolecular Stack Structure
Lee, Daehoon,Jin, Young-Jae,Kim, Hyojin,Suzuki, Nozomu,Fujiki, Michiya,Sakaguchi, Toshikazu,Kim, Seog K.,Lee, Wang-Eun,Kwak, Giseop American Chemical Society 2012 Macromolecules Vol.45 No.13
<P>Solvent-to-polymer chirality transfer was examined using conjugated polymer with intramolecular stack structure (IaSS). When achiral poly(diphenylacetylene)s (PDPAs) dissolved in limonene, the solvent chirality was successfully transferred to the side phenyl stack structure, leading to intramolecular axial chirality. The phenyl–phenyl IaSS was under thermodynamic control to readily undergo asymmetric changes in chiral limonene, leading to optical activity in the isotropic structure between the main chain and resonant side phenyl rings. The axial chirality was significantly affected by the chain length and substitution position of the side alkyl groups. The longer alkyl chains and bulkier alkyl group prevented direct intermolecular interactions between the side phenyl rings and the chiral limonene molecules. PDPA with sterically congested, highly stable, and regulated IaSS was not favorable for efficient solvent-to-polymer chirality transfer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2012/mamobx.2012.45.issue-13/ma300976r/production/images/medium/ma-2012-00976r_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma300976r'>ACS Electronic Supporting Info</A></P>
Piezochromic fluorescence in liquid crystalline conjugated polymers
Lee, Wang-Eun,Lee, Chang-Lyoul,Sakaguchi, Toshikazu,Fujiki, Michiya,Kwak, Giseop Royal Society of Chemistry 2011 Chemical communications Vol.47 No.12
<P>Liquid crystalline diphenylacetylene polymer derivatives showed piezochromic fluorescence <I>via</I> order-to-disorder phase transition.</P> <P>Graphic Abstract</P><P>The liquid crystalline conjugated polymers showed piezochromic fluorescence whose emission colour was significantly changed by mechanical stress and then completely restored by solvent annealing. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc04811a'> </P>
Lee, Wang-Eun,Oh, Chang-Jin,Park, Guen-Tae,Kim, Jin-Woo,Choi, Heung-Jin,Sakaguchi, Toshikazu,Fujiki, Michiya,Nakao, Ayako,Shinohara, Ken-ichi,Kwak, Giseop Royal Society of Chemistry 2010 Chemical communications Vol.46 No.35
<P>The significant variation in photoluminescence emission of poly(diphenylacetylene) derivatives according to the substitution position is due to the differences in the intramolecular π-stack structure and chain conformation.</P> <P>Graphic Abstract</P><P>The emission and chain conformation of poly(diphenylacetylene) derivatives are significantly influenced by the substitution position of trimethylsilyl group on the side phenyl ring. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc01481h'> </P>