Ya‐Qing Feng

Novel modification method of yellow pigment and its potential application in e-ink

Abstract Yellow SiO2/Hansa pigment composite particles were fabricated in an aqueous solution by electrostatic self-assembly method, in which cetyltrimethylammonium bromide was used as a coupling agent to give the yellow pigment particles a positive charge. Then, a thin shell of SiO2 was coated during the process of hydrolysis of Na2SiO3 to enhance the optical and mechanical properties as well as the charge load of the pigment particles. The product was characterised by transmission electron microscopy and thermogravimetric analysis, which showed that the SiO2 walls of the composite particles were compact. Fourier transform infrared spectroscopy showed the component of the composite particles. Zeta potential measurement proved that the SiO2/pigment particles had a higher charge load, and ultraviolet–visible spectra showed that the SiO2/pigment particles had a better optical property. Therefore, this type of composite particle had the merits of low density and strong durability in environments. The response behaviour of the microencapsulated electronic ink of the composite particles has been measured. This novel method is expected to produce various inorganic/organic nanocomposite particles with potential application in the fields of electronic paper and other material sciences.

Cycloaddition of Porphyrins to Isatin: Synthesis of Novel Spiro Porphyrin Derivatives

Abstract Isatin undergoes regioselective 1,3‐dipolar cycloaddition reactions with porphyrin azomethine ylides derived from Ni(II) β‐formyl‐meso‐tetraphenylporphyrins in the presence of N‐methylglycine to afford novel spiro porphyrin derivatives.

Novel approach for fabrication of hollow metal compound nanospheres

Abstract A novel process to fabricate rigid hollow spheres of less than 100 nm is described in the current paper. These hollow nanospheres were fabricated in an emulsion via an electrostatic deposition approach to synthesise a metal compound shell around wax particles. The wax cores were then removed via the calcination of composite spheres under a process of intermittent temperature raising to produce metal compound hollow spheres. The shell/core composite spheres were characterised by transmission electron microscopy, thermogravimetric analysis, X-ray powder diffraction and Fourier transform infrared spectroscopy, while the hollow spheres were characterised by transmission electron microscopy and atomic force microscopy. The hollow core size and the metal compound shell thickness can be easily varied over significant size ranges.

Novel Synthesis and Characterization of 1,3‐Bis(2‐dihydrothiazolyl)thiaalkoxy‐p‐tert‐butylcalix[4]arenes

Abstract A novel series of 1,3‐bis(2‐dihydrothiazolyl)thiaalkoxy‐p‐tert‐butylcalix[4]arenes generated by the reaction between 4,5‐dihydrothiazole‐2‐thiol and the different dibromide calix[4]aryl groups have been synthesized and structurally characterized by IR, 1H NMR, 13C NMR, and MS. From their analytical data, it was found that compounds 8, 9, and 10 had cone conformations, whereas compound 11 existed as a mixture conformation. To verify the structure of the synthetic compounds, a single‐crystal X‐ray structure of compound 8 was obtained.

3-[(E)-2-Chloro-3,3,3-trifluoro­prop-1-en­yl]-2,2-dimethyl-N-(3-pyrid­yl)cyclo­propane­carboxamide acetone hemisolvate

3-[(E)-2-Chloro-3,3,3-trifluoroprop-1-enyl]-2,2-dimethylcyclopropanecarboxylic acid is a very important intermediate for tefluthrin, an insecticide controlling a wide range of soil insect pests in maize, sugar beet, and other crops (Punja 1981). A pyridine ring is often used as an active component in pesticide discovery (Elbert et al., 2000). The title compound, (I), contains both active parts and may show some insecticidal activity.

Novel Synthesis and Characterization of N‐Substituted‐calix[4]azacrown Derivatives

Abstract Novel calix[4]azacrown derivatives from the reaction between calix[4]amidocrown and the different N‐(4‐bromoacetamidephthalimido)alkanes derivatives, which may be useful intemediate compounds of pseudorotaxane, have been synthesized and structurally characterized by IR, 1H NMR, 13C NMR, MS, and elemental analyses. From their analysis data, it was found that compounds 6a–d adopted a cone conformation.

(E)-4-[(4-Hydro­xy­phenyl)­diazenyl]­benz­aldehyde

The title compound, C13H10N2O2, is approximately planar in the solid state and displays a trans configuration with respect to the azo double bond. Molecules form infinite chains linked by O—H⋯O hydrogen bonds along the a axis.