2 research outputs found
Synthesis and characterisation of novel chiral smectic liquid crystalline elastomers containing menthol dimer-type side chain
<p>A series of siloxane-based chiral smectic liquid crystalline elastomers (ChSLCEs) formed by a dimer-type smectic monomer (M<sub>1</sub>), a dimer-type chiral smectic monomer (M<sub>2</sub>) and a smectic cross-linker (CL) were reported. M<sub>1</sub> and M<sub>2</sub> were both new liquid crystals with dimer structures, and their chemical structures and purities were characterised by Fourier transform infrared spectra and <sup>1</sup>H NMR. The thermal stability and mesomorphism of monomers, cross-linker and ChSLCEs were examined by different analytical techniques. The results showed both monomers exhibited excellent smectic properties. The combination of different smectic phases from the two liquid crystalline side chains endowed the obtained ChSLCEs with good chiral smectic properties. The effect of different dosages of cross-linkers on the mesomorphic properties of the elastomers was also examined. The temperature ranges of mesophase-isotropic phases was narrowed with increasing addition of the cross-linkers according to the differential scanning calorimetry. All of the ChSLCEs exhibited good thermal stability from thermal gravity analysis results. The effective cross-link densities of ChSLCEs were calculated according to the swelling experiments to give the fact that the molecular weights between the cross-linking points decrease with the increase of the cross-linkers. Novel achiral smectic monomer (M1), chiral smectic monomer (M2), and an achiral smectic crosslinking agent (CL) have been synthesized to form a series of side chain chiral smectic liquid crystalline elastomers (ChSLCEs) LCE1-LCE7 by graft copolymerization with the poly(methylhydrogeno)siloxane backbone</p
Recyclable Metallic Imidazolium-Based Ionic Liquid-Catalyzed Selective Mono- and Double-Hydroboration in Water
The recyclable metallic imidazolium-based ionic liquid-catalyzed
mono-hydroboration of imines, double-hydroboration of imine with aldehyde,
and double-hydroboration of aniline with glutaric dialdehyde in the
presence of HBpin in water is described for the first time. The ionic
liquid [BMIm][FeCl4] showed excellent activity, high selectivity,
and good recyclability for the catalytic imine hydroborations. This
catalytic system widely tolerated various functional rings and unsaturated
groups without additional reduction. Furthermore, the metallic ionic
liquid [BMIm][FeCl4] could be reused for more than 15 runs
in water without decay of the catalytic activity