- Synthesis and Characterization of a New Series of Paramagnetic Ferroelectric Liquid Crystalline Nitroxide Radicals
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A new series of all-organic liquid-crystalline (LC) chiral radical compounds,trans-1-alkoxyphenyl-4-[(4-(4-alkoxyphenyl)-2,5-dimethylpyrrolidine-1-oxy-2-yl)-benzylideneamino]benzenes (1) with various alkyl chains, containing a chiral nitroxide unit in the mesogen core were synthesized and their LC properties were fully characterized. The enantiomerically enriched compounds (2S,5S)-1 showed N, TGBA, SmA and SmC phases, while the racemates (±)-1 exhibited N, SmA and SmC phases. The phase transition behavior and the ferroelectric properties of the SmC phase of (2S,5S)-1 differed from those of previously reported analogues with an ester group as a substitute for the imino group of (2S,5S)-1. Some of the (2S,5S)-1 series showed a temperature-dependent spontaneous polarization PS (θ) inversion. We discuss the origin of this difference in terms of their molecular structures optimized by molecular orbital calculations. The phase transition behavior supports the hypothesis that the large φ, which is defined as the angle between the molecular long axis (one of the principal axes of inertia) and the direction of the dipole moment in each molecule, results in the stabilization of the SmA (SmA) phase.
- Uchida, Yoshiaki,Tamura, Rui,Suzuki, Katsuaki,Takahashi, Hiroki,Aoki, Yoshio,Nohira, Hiroyuki
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- S1P AND/OR ATX MODULATING AGENTS
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Compounds of formula (I) wherein: X is -0-, -S(0)r-, -CH2-, or -NR-, wherein r is 0, 1, or 2; X 1, X2, and X5 are each independently CR7 or N; one of X3 or X4 is C and
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Paragraph 00156
(2014/06/11)
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- Tuning 'de Vries-like' properties in binary mixtures of liquid crystals with different molecular lengths
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Smectic liquid crystals with 'de Vries-like' properties are characterized by a maximum layer contraction of ≤1% upon transition from the orthogonal SmA phase to the tilted SmC phase. We show that binary mixtures of 'de Vries-like' and conventional SmC mesogens with a molecular length ratio of 1.34 undergo a SmA-SmC phase transition with a maximum layer contraction ranging from 1.0 to 1.9% depending on the mixture composition.
- Song, Qingxiang,Bogner, Andreas,Giesselmann, Frank,Lemieux, Robert P.
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supporting information
p. 8202 - 8204
(2013/09/12)
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- Aryl-aryl dendrimers
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Light emitting devices are incorporate, as the light emitting element, a dendrimer of which the constituent dendrons include a conjugated dendritic structure comprising aryl and/or heteroaryl groups connected to each other via bonds between sp2 hybridized ring atoms of said aryl or heteroaryl groups.
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- Metal-containing dendrimers
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This invention relates to a light emitting device which comprises at least one layer that contains an organometallic dendrimer having a core comprising a metal cation. The invention also relates to organometallic dendrimers and methods for producing the s
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- Synthesis of nonconjugated dendrons with a redox gradient
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Macromolecules with built-in redox gradients are of much interest due to their potential in a variety of optoelectronic and energy-harvesting applications. In this paper, the design and synthesis of nonconjugated dendrons with redox gradients to guide the charge flow from the core to the periphery is described. The dendrons reported here are based on benzyl ether connectivities. The repeat units of the dendrons are based on triarylamines, and the periphery units of the dendrons are based on N,N,N′,N′-tetraarylbenzidine units. The presence of a redox gradient after incorporation of these charge-transporting units into the dendrons is supported by cyclic voltammetric studies.
- Bronk, Krys,Thayumanavan
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p. 5559 - 5567
(2007/10/03)
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- Nuclear monobromination of alkyl phenyl ethers with NaClO2, NaBr, Mn(acac)3, and moist silica gel in aprotic solvent
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Nuclear monobromination of aromatic ethers can be achieved with a NaClO2/NaBr/Mn(acac)3 catalyst/silica gel system in dichloromethane in regioselective and high-yielding manner under mild conditions.
- Hirano, Masao,Monobe, Hiroyuki,Yakabe, Shigetaka,Morimoto, Takashi
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p. 1463 - 1470
(2007/10/03)
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- Regioselective aromatic monobromination of alkyl phenyl ethers with NaClO2, NaBr, Mn(acac)3, and Montmorillonite K10 in dichloromethane
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Regioselective and high-yielding nuclear monobromination of aromatic ethers can be accomplished with a combination of NaClO2, NaBr, and Mn(acac)3 catalyst in dilchloromethane under mild and neutral conditions with the aid of Montmorillonite K10.
- Hirano, Masao,Yakabe, Shigetaka,Monobe, Hiroyuki,Morimoto, Takashi
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p. 669 - 676
(2007/10/03)
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- Kaolin-assisted Aromatic Chlorination and Bromination
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Moist kaolin catalyses the regioselective and high-yielding chlorination and bromination of C6H5OR (R = C1-C8 alkyl. Bu1, allyl, cyclohexyl, benzyl) to 4-XC6H4OR (X = Cl and Br, respectively) with NaCl02 and Mn(acac)3 in CH2Cl2 in the absence and presence of NaBr, respectively, under mild and neutral conditions.
- Hirano, Masao,Monobe, Hiroyuki,Yakabe, Shigetaka,Morimoto, Takashi
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p. 662 - 663
(2007/10/03)
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- Chiral cyclohexyl compounds
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The present invention describes liquid crystal compounds which are suitable for use in liquid crystal devices including those which exploit the electroclinic effect.
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- P-terphenyl derivatives and liquid crystalline compositions
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New p-terphenyl derivatives useful as components for preparing practical ferroelectric liquid crystalline compositions and excellent in chemical stability, as well as liquid crystalline compositions containing at least one of the p-terphenyl derivatives.
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