A new capillary gas chromatography stationary phase, monokis (2,6 di O benzyl 3 O propyl (3’)) hexakis(2,6 di O benzyl 3 O methyl) β CD bonded polysiloxane, was synthesized. It ex...A new capillary gas chromatography stationary phase, monokis (2,6 di O benzyl 3 O propyl (3’)) hexakis(2,6 di O benzyl 3 O methyl) β CD bonded polysiloxane, was synthesized. It exhibited separation abilities to disubstituted benzene isomers and some chiral solutes. It was also found that the polarity of CD derivatives can be lowered both by chemically bonding it to polysiloxane and by diluting it in polysiloxane. The separation abilities of the polysiloxane anchored CDs (SP CD) are higher than that of the unbonded CDs (S CD) and the diluted S CD at lower column temperature. Hydrosilylation reaction is one of the best methods to lower the operating temperature of CDs.展开更多
Polysiloxane with pendant [60] fulleropyrrolidines was synthesized and used as the stationary phase for capillary gas chromatography for the first time. A preliminary investigation of its property shows that it has an...Polysiloxane with pendant [60] fulleropyrrolidines was synthesized and used as the stationary phase for capillary gas chromatography for the first time. A preliminary investigation of its property shows that it has an excellent thermostability and a wide range of allowable operating temperature from 80 degrees C to 360 degrees C.展开更多
A new ionic liquids grafted polysiloxane used as stationary phase for capillary gas chromatography （CGC） is described. The stationary phase of 1-vinyl-3-hexylimidazolium hexafluorophosphate anchored to polysiloxane ...A new ionic liquids grafted polysiloxane used as stationary phase for capillary gas chromatography （CGC） is described. The stationary phase of 1-vinyl-3-hexylimidazolium hexafluorophosphate anchored to polysiloxane （PMHS-[VHIm][PF6]） was synthe- sized, characterized and coated onto capillary columns by static coating. The results show that the present stationary phase exhibits a very good chromatographic resolution and selectivity for Grob test mixture and alcohols with baseline resolution and symmetry peaks. The present work suggests that novel stationary phase has a great potential for further development and application. 2009 Mei Ling Qi. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
A new compound of mono 6 (1' benzo aza 15 crown 5) 2,3,6 permethyl β cyclodextrin (BA 15C5 PM CD) was synthesized. The structure was determined to be coincide with our anticipation by spectroscopy....A new compound of mono 6 (1' benzo aza 15 crown 5) 2,3,6 permethyl β cyclodextrin (BA 15C5 PM CD) was synthesized. The structure was determined to be coincide with our anticipation by spectroscopy. As a stationary phase for capillary gas chromatography, excellent separation for enantiomers and positional isomers was achieved.展开更多
Three new chiral stationary phases （CSPs） for high-performance liquid chromatography were prepared from R-（3,3＇-halogen substituted-1,1＇-binaphthyl）-20-crown-6 （halogen=C1, Br and I ）. The experimental results...Three new chiral stationary phases （CSPs） for high-performance liquid chromatography were prepared from R-（3,3＇-halogen substituted-1,1＇-binaphthyl）-20-crown-6 （halogen=C1, Br and I ）. The experimental results showed that R-（3,3＇-dibromo-l,l＇-binaphthyl）-20-crown-6 （CSP-1） possesses more prominent enantioselectivity than the two other halogen-substituted crown ether derivatives. All twenty-one a-amino acids have different degrees of sep- aration on R-（3,3＇-dibromo-l,l＇-binaphthyl）-20-crown-6-based CSP-1 at room temperature. The enantioselectivity of CSP-1 is also better than those of some commercial R-（1, 1＇-binaphthyl）-20-crown-6 derivatives. Both the separa- tion factors （a） and the resolution （Rs） are better than those of commercial crown ether-based CSPs [CROWNPAK CR（＋） from Daicel] under the same conditions for asparagine, threonine, proline, arginine, serine, histidine and va- line, which cannot be separated by commercial CR（＋）. This study proves the commercial usefulness of the R-（3,3＇-dibromo- 1, 1＇-binaphthyl）-20-crown-6 chiral stationary phase.展开更多
文摘A new capillary gas chromatography stationary phase, monokis (2,6 di O benzyl 3 O propyl (3’)) hexakis(2,6 di O benzyl 3 O methyl) β CD bonded polysiloxane, was synthesized. It exhibited separation abilities to disubstituted benzene isomers and some chiral solutes. It was also found that the polarity of CD derivatives can be lowered both by chemically bonding it to polysiloxane and by diluting it in polysiloxane. The separation abilities of the polysiloxane anchored CDs (SP CD) are higher than that of the unbonded CDs (S CD) and the diluted S CD at lower column temperature. Hydrosilylation reaction is one of the best methods to lower the operating temperature of CDs.
文摘Polysiloxane with pendant [60] fulleropyrrolidines was synthesized and used as the stationary phase for capillary gas chromatography for the first time. A preliminary investigation of its property shows that it has an excellent thermostability and a wide range of allowable operating temperature from 80 degrees C to 360 degrees C.
基金the National Natural Science Foundation of China for the funding(No.20675007)
文摘A new ionic liquids grafted polysiloxane used as stationary phase for capillary gas chromatography （CGC） is described. The stationary phase of 1-vinyl-3-hexylimidazolium hexafluorophosphate anchored to polysiloxane （PMHS-[VHIm][PF6]） was synthe- sized, characterized and coated onto capillary columns by static coating. The results show that the present stationary phase exhibits a very good chromatographic resolution and selectivity for Grob test mixture and alcohols with baseline resolution and symmetry peaks. The present work suggests that novel stationary phase has a great potential for further development and application. 2009 Mei Ling Qi. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘A new compound of mono 6 (1' benzo aza 15 crown 5) 2,3,6 permethyl β cyclodextrin (BA 15C5 PM CD) was synthesized. The structure was determined to be coincide with our anticipation by spectroscopy. As a stationary phase for capillary gas chromatography, excellent separation for enantiomers and positional isomers was achieved.
基金This work was supported by the National Natural Science Foundation of China （Nos. 21675141, 21165022）.
文摘Three new chiral stationary phases （CSPs） for high-performance liquid chromatography were prepared from R-（3,3＇-halogen substituted-1,1＇-binaphthyl）-20-crown-6 （halogen=C1, Br and I ）. The experimental results showed that R-（3,3＇-dibromo-l,l＇-binaphthyl）-20-crown-6 （CSP-1） possesses more prominent enantioselectivity than the two other halogen-substituted crown ether derivatives. All twenty-one a-amino acids have different degrees of sep- aration on R-（3,3＇-dibromo-l,l＇-binaphthyl）-20-crown-6-based CSP-1 at room temperature. The enantioselectivity of CSP-1 is also better than those of some commercial R-（1, 1＇-binaphthyl）-20-crown-6 derivatives. Both the separa- tion factors （a） and the resolution （Rs） are better than those of commercial crown ether-based CSPs [CROWNPAK CR（＋） from Daicel] under the same conditions for asparagine, threonine, proline, arginine, serine, histidine and va- line, which cannot be separated by commercial CR（＋）. This study proves the commercial usefulness of the R-（3,3＇-dibromo- 1, 1＇-binaphthyl）-20-crown-6 chiral stationary phase.
