- Mixed cellulose-derived benzoates bonded on allylsilica gel as HPLC chiral stationary phases: Influence of the introduction of an aromatic moiety in the fixation substituent
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Several mixed alkenoxybenzoyl/benzoates and 10-undecenoyl/benzoates of cellulose were fixed onto allylsilica gel by the radical coupling of double bonds. The introduction of an aromatic group in the fixation substituent modifies the chiral recognition abi
- Garces, Jordi,Franco, Pilar,Oliveros, Laureano,Minguillon, Cristina
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- Structure-properties relationships in liquid crystal thiols
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Two new series of thiols were studied in order to establish the structure-properties relationships. First series consists of compounds with three or four aromatic rings as rigid part of mesogen and the second contains thiols with a flexible chain attached
- Cseh, Liliana,Mehl, Georg
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p. 879 - 885
(2014/08/18)
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- Bent-core liquid crystal (LC) decorated gold nanoclusters: Synthesis, self-assembly, and effects in mixtures with bent-core LC hosts
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We present the first synthesis of a series of thiol-, thioacetate-, and xanthate-terminated bent-core derivatives, as well as the preparation of gold nanoclusters using the thiol-terminated bent-core compounds. The mesomorphic properties of the bent-core compounds have been investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and electro-optic tests. From this series, the mono-xanthate derivatives form rectangular or hexagonal columnar phases, and the mono-thiol derivative with shorter alkyl chains forms a metastable, likely smectic, phase. All other bent-core compounds and intermediates exclusively form disordered or multi-layer lamellar crystalline solid modifications. High-resolution transmission electron microscopy (HR-TEM) images of the bent-core functionalized gold nanoclusters prepared from the thiol-terminated derivatives, taken after slow evaporation of the solvent, provide evidence for the formation of self-assembled nanocluster arrays. Upon dispersion of these gold nanoclusters in two structurally related bent-core LC hosts (one forming a SmCPA, and the second with a terminal double bond displaying a Colr phase), a shift in the surface plasmon resonance was observed indicating a LC host-dependent aggregation of the nanoparticles. Finally, we report initial results on the effects of different concentrations of these nanoclusters on the thermal properties as well as the applied voltage/current response of the parent SmCPA host.
- Marx, Vanessa M.,Girgis, Hidy,Heiney, Paul A.,Hegmann, Torsten
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supporting information; experimental part
p. 2983 - 2994
(2010/02/27)
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- Liquid Crystalline Main Chain Polysiloxane Esters and their Monomers. Part I: Synthesis of some di(ω-unsaturated esters) and their thermal behaviour
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As starting material for liquid crystalline polyesters, a number of bisarenes (arising from the diols hydroquinone, 4,4'-biphenyldiol, 1,6-di(4-hydroxyphenyl)hexane, 2,7-fluorenediol and 2,7-fluorenonediol) have been synthesize
- Kossmehl, G.,Gerecke, B.,Harmsen, N.,Schroeder, F.,Vieth, H. M.
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- Synthesis and chomatographic properties of liquid crystalline polysiloxanes containing steroid substituents
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A series of alkenyl-substituted cholesterol and related steroids have been prepared.These liquid-crystalline compounds were hydrosilylated onto polyhydromethylsiloxane.The polymers have a broad range of liquid crystallinity even if the starting alkenes ha
- Adams, Nathan W.,Bradshaw, Jerald S.,Bayona, Jose-Maria,Markides, Karin E.,Lee, Milton L.
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