A new C-19-diterpenoid alkaloid. 1-epicrassicaudine, was isolated from the roots of Aconitum hemslevanum Pritz var. pengshinese. Spectral methods demonstrated that it has the structure represented by (1) an 1-epimer o...A new C-19-diterpenoid alkaloid. 1-epicrassicaudine, was isolated from the roots of Aconitum hemslevanum Pritz var. pengshinese. Spectral methods demonstrated that it has the structure represented by (1) an 1-epimer of crassicaudine.展开更多
A Fe-containing mesoporous silica has been synthesized at room temperature using alkylamine as templating surfactant; XRD, IR, ESR and Si-29 MAS NMR spectra provided evidence of the presence of framework and non-frame...A Fe-containing mesoporous silica has been synthesized at room temperature using alkylamine as templating surfactant; XRD, IR, ESR and Si-29 MAS NMR spectra provided evidence of the presence of framework and non-framework iron(III) in Fe-HMS material.展开更多
A novel aluminosilicate with well-defined bimodal mesopore distribution has been synthesized directly, in which one mesopore is distributed at around 3.8nm and the other at 2.6nm.
A mesoporous chromium silicate molecular sieve with MCM-41 structure has beers prepared by direct hydrothermal synthesis; XRD; framework IR, ESR and DR-UV spectroscopies provided evidence of the presence of framework ...A mesoporous chromium silicate molecular sieve with MCM-41 structure has beers prepared by direct hydrothermal synthesis; XRD; framework IR, ESR and DR-UV spectroscopies provided evidence of the presence of framework and extraframework chromium(III) in CrMCM-41 zeolite.展开更多
文摘A new C-19-diterpenoid alkaloid. 1-epicrassicaudine, was isolated from the roots of Aconitum hemslevanum Pritz var. pengshinese. Spectral methods demonstrated that it has the structure represented by (1) an 1-epimer of crassicaudine.
文摘A Fe-containing mesoporous silica has been synthesized at room temperature using alkylamine as templating surfactant; XRD, IR, ESR and Si-29 MAS NMR spectra provided evidence of the presence of framework and non-framework iron(III) in Fe-HMS material.
文摘A novel aluminosilicate with well-defined bimodal mesopore distribution has been synthesized directly, in which one mesopore is distributed at around 3.8nm and the other at 2.6nm.
文摘A mesoporous chromium silicate molecular sieve with MCM-41 structure has beers prepared by direct hydrothermal synthesis; XRD; framework IR, ESR and DR-UV spectroscopies provided evidence of the presence of framework and extraframework chromium(III) in CrMCM-41 zeolite.
