- The Impact of Chiral Citronellyl-Functionalization on Indolenine and Anilino Squaraine Thin Films
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The impact on chiral aggregation in solution processed and thermally annealed thin films of two indolenine and one anilino squaraines with chiral (S)-citronellyl functionalization at the nitrogen of the squaraine backbone is investigated. A pseudo polymor
- Balzer, Frank,Beverina, Luca,Lützen, Arne,Mattiello, Sara,Meerholz, Klaus,Schiek, Manuela,Schmidtmann, Marc,Schulz, Matthias,Schumacher, Marvin F.,Serdar Sariciftci, N.,Zablocki, Jennifer
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- Long-lived charge-transfer state from B?N frustrated Lewis pairs enchained in supramolecular copolymers
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The field of supramolecular polymers is rapidly expanding; however, the exploitation of these systems as functional materials is still elusive. To become competitive, supramolecular polymers must display microstructural order and the emergence of new prop
- Adelizzi, Beatrice,Chidchob, Pongphak,Tanaka, Naoki,Lamers, Brigitte A.G.,Meskers, Stefan C.J.,Ogi, Soichiro,Palmans, Anja R.A.,Yamaguchi, Shigehiro,Meijer
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supporting information
p. 16681 - 16689
(2020/11/09)
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- Disc-like chiral palladium and platinum complexes: Synthesis and mesomorphic properties
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ortho-Palladated and -platinated benzalimines are a widely studied novel type of liquid-crystals. These sheet-shaped materials contain two or even four metal atoms and carry eight and twelve flexible side-chains, respectively. Here we present the preparation and mesomorphic properties of dinuclear chiral homologues of such sheet-like compounds. On their own, the chiral members of the dinuclear cyclopalladated series exhibit no liquid-crystalline properties, but show mesophase inductions (Colh-phase) in mixtures with an electron-acceptor, e.g.,2,4,7-trinitroflourenone (TNF). A diplatinated chiral analogue, however, monotropically exhibits the cholesteric nematic discotic (ND/*) type of mesophase. Mixtures of this platinum nematogen with TNF also show the induction of a columnar mesophase (Colh) due to charge-transfer interactions.
- Eran, Belkiz Bilgin,Singer, Dirk,Praefcke, Klaus
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p. 111 - 116
(2007/10/03)
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- Synthesis and structure of poly(phenyl isocyanate)s bearing an optically active alkoxyl group
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Novel optically active phenyl isocyanate derivatives (1-6) bearing an (R)-sec-butoxy, (S)-2-methylbutoxy or (S)-3,7-dimethyloctyloxy group at the meta or para position on the phenyl ring were prepared and polymerized with an anionic initiator in tetrahydrofuran (THF). The resulting polymers from 1, 2, 4 and 6 showed much greater specific rotation than that of the corresponding monomers and an intense circular dichroism (CD) band in the main-chain absorption region, indicating that these polymers have a predominantly one-handed helical conformation in solution. On the other hand, the polymers obtained from 3 and 5 showed a much smaller specific rotation than that of the above polymers at room temperature. The polymers from 2 and 5 showed a remarkable change in optical activity with change in temperature, and the specific rotation of the polymers changed from a positive to a negative value with decrease in temperature. The CD band of the polymers in the absorption region due to the main chain changed from a positive to a negative peak with a change in specific rotation. These results indicate that poly-2 and poly-5 undergo a thermally induced helix-helix transition in THF. The temperature for the helix-helix transition of poly-2 was independent of the degree of polymerization. Poly-2 exhibited a reversible helix-helix transition in chloroform and diethyl ether and also in THF, whereas in toluene and dichloromethane such a transition was not observed. Copyright
- Hino, Kyoko,Maeda, Katsuhiro,Okamoto, Yoshio
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p. 361 - 367
(2007/10/03)
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