111928-38-2Relevant academic research and scientific papers
The effect of intermolecular actions on the mesomorphic properties of alkenoxy biphenyl-based liquid crystals
Zhu, Shengbo,Chigan, Jin,Li, Wei,Yang, Jingyu,Chen, Weixing,Zhang, Wenzhi,Niu, Xiaoling,Chen, Xinbing,An, Zhongwei
, (2019)
Two series of alkenoxy-biphenyl compounds have been synthesized and characterized for investigating the relationship between intermolecular actions (e.g., π-π stacking, dipole-dipole interactions, and van der Waals interactions) and the mesomorphic properties. Firstly, their mesophases were determined by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). Then, Density Functional Theory (DFT) calculations, UV absorption spectra and fluorescence (FL) emission spectra were also conducted to assist in analyzing their mesomorphic properties. The results show that the type and stability of liquid crystal mesophases are dependent on the intermolecular actions. Moreover, suitably modifying intermolecular actions by the terminal groups has been proved to be an effective approach to regulate the formation and stability of nematic/smectic mesophases.
Liquid crystal polyfunctional acrylate derivative and polymer thereof
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, (2008/06/13)
A compound represented by the following general formula (1a) or (1b), a liquid crystal composition containing the compound, and a polymer obtained by polymerizing the compound or the composition: wherein R1 represents a fluorine atom, an alkyl
Siloxane-supported organometallic compounds and their catalytic activities for the hydrosilylation of vinylsilanes and dienes
Amako, Masaaki,Schinkel, Jonathan,Freiburger, Lee,Brook, Michael A.
, p. 74 - 81 (2007/10/03)
Two different classes of silicone-modified ligands were prepared: nitrile derivatives, 4′-[3-(organosilyl)propoxy]-biphenyl-4-carbonitrile R′3SiC3H6OC6H 4C6H4CN 2 (R′3Si- = a: Me 3SiOSiMe2-, b: (Me3SiO)2SiMe-, c: Me3SiO(Me2SiO)3SiMe2-, d: Me 3SiO(Me2SiO)25SiMe2-); and, pyridine derivatives, isonicotinic acid 2-methoxy-4-[3-(organosilyl)propyl]phenyl ester R′3SiC 3H6Ph(OMe)OC(O)C5H4N 6. Compounds 2 and 6 were bound to Pd and Pt using ligand substitution reactions with organometallic precursors to give (R3SiC3H 6OC6H4C6H4CN) 2PdCl2 3, (R3SiC3H 6OC6H4C6H4CN) 2PtCl2 4 and (R3SiC3H 6C6H3(OMe)OC(O)C5H 4N)PtCl2(η2-1-octene) 8. The polydimethylsiloxane (PDMS)-supported Pt and Pd compounds 3d and 4d had excellent solubility in both organic solvents and polysiloxanes. All the Pt compounds exhibited good catalytic activity for hydrosilylation of vinylsilanes. The PDMS-supported Pd compound 3d also was effective catalyst for hydrosilylation of a diene, isoprene, with 1,1,1,3,3-pentamethyldisiloxane MMH to produce the 1,4-adduct Me3SiOSiMe 2CH2CH=CMeCH2-H as a major product.
Organotin compounds bearing mesogenic sidechains: synthesis, X-ray structures and polymerisation chemistry
Deacon, P.R.,Devylder, N.,Hill, M.S.,Mahon, M.F.,Molloy, K.C.,Price, G.J.
, p. 45 - 56 (2007/10/03)
Organotin compounds R3Sn(CH2)n+2OC6H4C6H4Y (R3 = Ph3, Ph2Bu, Y = H, CN; n = 1-3) and RX2Sn(CH2)n+2OC6H4Y (R = Ph, Bu; Y = H, X = Br, I; n = 1-3) have been synthesised and characterised by 1H-, 13C-, 119Sn-NMR and Moessbauer spectroscopies. X-ray crystallography reveals tetrahedral geometries for Ph3Sn(CH2)4OC6H4C6H5 and Ph3Sn(CH2)3OC6H4C6H4CN, a six-coordinated, bromine-bridged dimeric structure for PhBr2Sn(CH2)3OC6H4C6H5 containing a mer-Br3C2OSn coordination sphere about tin and five-coordinated monomeric structure for PhBr2Sn(CH2)3OC6H4C6H4CN. In all cases there is strong alignment of mesogenic groups in the solid-state but only PhBr2(CH2)3OC6H4C6H4CN shows any indication of liquid-crystal behaviour. Wurtz polymerisation of RBr2Sn(CH2)5OC6H4C6H5 (R = Ph, Bu), both of which contain non-chelating ether functions, generated polystannanes (RR'Sn)n with Mn 2.3*105; Mw 3.0*105; Mw/Mn 1.30 and Mn 1.3*105; Mw 2.5*105; Mw/Mn 1.96, respectively, while no polymer was obtained from chelated PhBr2Sn(CH2)3OC6H4C6H5.
