In this study, right-handed dicinnamate isosorbide was synthesized via the esterification reaction betweefi optically active isosorbide and cinnamate. The chiral dopant was characterized by FT-IR, ^1H NMR, elemental a...In this study, right-handed dicinnamate isosorbide was synthesized via the esterification reaction betweefi optically active isosorbide and cinnamate. The chiral dopant was characterized by FT-IR, ^1H NMR, elemental analysis, SEM, UV absorption spectrum. After dissolving in a nematic liquid crystal mixture, the chiral dopant exhibited a temperature-dependent solubility in the chiral nematic liquid crystal mixture. Meanwhile, a relatively high value of helical twisting power of the polymerizable chiral dopant was determined. The results show that the chiral dopant has great potential in achieving a polymer stabilized chiral nematic liquid crystal film with a broad-band selective reflection. C 2009 Huai Yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
NH3-CH3OH system was studied by ab initio calculations at the Hartree-Fock level using the 6-31Gbasis set. Equilibrium geometries of both of its ionic (type I and II) and neutral clusters are obtained. Different disso...NH3-CH3OH system was studied by ab initio calculations at the Hartree-Fock level using the 6-31Gbasis set. Equilibrium geometries of both of its ionic (type I and II) and neutral clusters are obtained. Different dissociation channels are evaluated for I and II, respectively. The results suggest that when NH3-CH3OH is vertically ionized,CH3O + NH+ are the dominant products via a proton transfer reaction, and accompanying the dissociation of (NH3-CH3OH)+ver to NH3 + + CH3OH, intracluster charge transfer process takes place in the system.展开更多
The clusters generated by direct laser vaporization of KH2PO4 and Cu-3(PO4)(2) samples are studied by a TOF mass spectrometer. It is found that mainly the [K(KPO3)(n)]* cluster series is generated from KH2PO4 sample a...The clusters generated by direct laser vaporization of KH2PO4 and Cu-3(PO4)(2) samples are studied by a TOF mass spectrometer. It is found that mainly the [K(KPO3)(n)]* cluster series is generated from KH2PO4 sample and it demonstrates obvious magic numbers, which are n=3, 6, 9, 12, 15. Direct laser vaporization of Cu-3(PO4)(2) sample produced [Cu(CuPO3)n]* cluster series as well as other series with the same building block of (CUPO3).展开更多
基金supported by the National Basic Research Program of China(No.2007CB613301)the National Natural Science Foundation(No.20674005)the Program of Beijing Municipal Science and Technology(No.Y0405004040121).
文摘In this study, right-handed dicinnamate isosorbide was synthesized via the esterification reaction betweefi optically active isosorbide and cinnamate. The chiral dopant was characterized by FT-IR, ^1H NMR, elemental analysis, SEM, UV absorption spectrum. After dissolving in a nematic liquid crystal mixture, the chiral dopant exhibited a temperature-dependent solubility in the chiral nematic liquid crystal mixture. Meanwhile, a relatively high value of helical twisting power of the polymerizable chiral dopant was determined. The results show that the chiral dopant has great potential in achieving a polymer stabilized chiral nematic liquid crystal film with a broad-band selective reflection. C 2009 Huai Yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘NH3-CH3OH system was studied by ab initio calculations at the Hartree-Fock level using the 6-31Gbasis set. Equilibrium geometries of both of its ionic (type I and II) and neutral clusters are obtained. Different dissociation channels are evaluated for I and II, respectively. The results suggest that when NH3-CH3OH is vertically ionized,CH3O + NH+ are the dominant products via a proton transfer reaction, and accompanying the dissociation of (NH3-CH3OH)+ver to NH3 + + CH3OH, intracluster charge transfer process takes place in the system.
文摘The clusters generated by direct laser vaporization of KH2PO4 and Cu-3(PO4)(2) samples are studied by a TOF mass spectrometer. It is found that mainly the [K(KPO3)(n)]* cluster series is generated from KH2PO4 sample and it demonstrates obvious magic numbers, which are n=3, 6, 9, 12, 15. Direct laser vaporization of Cu-3(PO4)(2) sample produced [Cu(CuPO3)n]* cluster series as well as other series with the same building block of (CUPO3).
