Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl...Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl chloride as the reaction termi-nating agent. The polymer was characterized by FTIR and SEC. The emulsifier-free emul-sion polymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) containingvarious concentrations of PEO-A was studied. In all cases stable emulsion coplymerizationsof MMA and BA were obtained. The stabilizing effect was found to be dependent on themolecular weight and the feed amount of the macromonomer.展开更多
A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible n...A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible non-fluorescent absorption upon coordination to Cu2+,which is a rather unusual phenomenon for rhodamine B derivatives.Stoichiometric measurements using the Job's method and the molar ratio method reveal that one CARB molecule combines two Cu2+ ions,and the two Cu2+ ions play different roles:one opens the spirocyclic structure and the other quenches the fluorescence of the xanthene moiety.This reaction mechanism is supported by a comparative study on the model compound N-acryloyl rhodamine B hydrazide as well as by the density functional theory calculations.Furthermore,the absorption response of CARB is highly selective for Cu2+ over other common ions,which implies that CARB may be used as a colorimetric probe for the rapid visual detection of Cu2+.展开更多
Acryloyl fluoride is an ideal molecule for investigating the phenomenon of hindered internal rotation.In concert with recently acquired high-resolution UV absorption spectrum of acryloyl fluoride,in this study,the abs...Acryloyl fluoride is an ideal molecule for investigating the phenomenon of hindered internal rotation.In concert with recently acquired high-resolution UV absorption spectrum of acryloyl fluoride,in this study,the absorption spectra of the s-trans and s-cis isomers of acryloyl fluoride were theoretically simulated.The simulated spectra were convoluted by a Gaussian function with displacement,distortion,Franck-Condon,Herzberg-Teller,and Duschinsky effects in the framework of the time-independent model.The statistical vibronic transition analysis reveals the unity of the spectrum transition property,the relevant normal modes,and the primary geometrical variations,enriching the understanding of the experimental observation.The discrepancy between the theoretical and experimental spectra was interpreted clearly.展开更多
Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoiso...Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoisomer was isolated with high diastereoselective excess.展开更多
文摘Well-defined nonionic hydrophilic ω-acryloyl poly(ethylene oxide) macro-monomer (PEO-A) has been prepared by living anionic polymerization of ethylene oxidewith diphenyl methyl potassium as the initiator and acryloyl chloride as the reaction termi-nating agent. The polymer was characterized by FTIR and SEC. The emulsifier-free emul-sion polymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) containingvarious concentrations of PEO-A was studied. In all cases stable emulsion coplymerizationsof MMA and BA were obtained. The stabilizing effect was found to be dependent on themolecular weight and the feed amount of the macromonomer.
基金supported by grants from the National Natural Science Foundation of China (20935005,90813032 & 20875092)National Basic Research Program of China (2010CB933502 & 2011CB935800)the Chinese Academy of Sciences
文摘A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible non-fluorescent absorption upon coordination to Cu2+,which is a rather unusual phenomenon for rhodamine B derivatives.Stoichiometric measurements using the Job's method and the molar ratio method reveal that one CARB molecule combines two Cu2+ ions,and the two Cu2+ ions play different roles:one opens the spirocyclic structure and the other quenches the fluorescence of the xanthene moiety.This reaction mechanism is supported by a comparative study on the model compound N-acryloyl rhodamine B hydrazide as well as by the density functional theory calculations.Furthermore,the absorption response of CARB is highly selective for Cu2+ over other common ions,which implies that CARB may be used as a colorimetric probe for the rapid visual detection of Cu2+.
文摘Acryloyl fluoride is an ideal molecule for investigating the phenomenon of hindered internal rotation.In concert with recently acquired high-resolution UV absorption spectrum of acryloyl fluoride,in this study,the absorption spectra of the s-trans and s-cis isomers of acryloyl fluoride were theoretically simulated.The simulated spectra were convoluted by a Gaussian function with displacement,distortion,Franck-Condon,Herzberg-Teller,and Duschinsky effects in the framework of the time-independent model.The statistical vibronic transition analysis reveals the unity of the spectrum transition property,the relevant normal modes,and the primary geometrical variations,enriching the understanding of the experimental observation.The discrepancy between the theoretical and experimental spectra was interpreted clearly.
文摘Asymmetric 1,3-dipolar cycloaddition of nitrite oxides to an acryloyl ester (1) derived from 1, 2:5, 6-di-O-isopropylidene glucose (6) was studied. Solvent and temperature effect was discussed. The single diastereoisomer was isolated with high diastereoselective excess.
