Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was suc...Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was successfully induced by D-,L-phenylalanine(Phe) and other amino acids in NaCl solution.The chiral J-aggregates showed a characteristic,induced circular dichroism(ICD) in the visible region of J-band chromophore which depends on the absolute configuration,concentration and side groups of α-amino acids,as well as temperature.The atomic force microscopy images indicated that the J-aggregates exist in large bundles of entangled nanofibers,and the observed ICD might result from the macroscopic helical arrangement of the assemblies.展开更多
Optical isomers of N-lauroyl-L-（Or-D-） alanine sodium salt {C12-L-（Or-D-）AIaS} surfactants were used for the preparation of mesoporous silica nanoparticles with a twisted hexagonal rod-like morphology. Thermogravi...Optical isomers of N-lauroyl-L-（Or-D-） alanine sodium salt {C12-L-（Or-D-）AIaS} surfactants were used for the preparation of mesoporous silica nanoparticles with a twisted hexagonal rod-like morphology. Thermogravimetric analysis （TGA） was used to determine the temperature for template removal. Circular dichroism （CD） spectra of the surfactant solution with various compositions illustrated the formation and supramolecular assembly of protein-like molecular architecture leading to formation of twisted nanopar- ticles. Scanning electron microscopy （SEM）, high-resolution transmission electron microscopy （HRTEM） and X-ray powder diffraction （XRD） patterns of these as-synthesized mesoporous silica confirmed that the twisted morphology of these nanoparticles was closely related to the supramolecular-assembled complex of amino acid surfactants.展开更多
基金Supported by the National Natural Science Foundation of China (Grant Nos. 20571085, 20604033 & 20877099)the Fund of the State Key Laboratory of Natural and Biomimetic Drugs (Grant No. 20080208)+1 种基金Graduate University of Chinese Academy of Sciences (Grant No. 2007-2009)Jiangsu Provincial Key Laboratory of Organic Chemistry Foundation and Natural Science Foundation of Jiangsu Province (Grant No. BK2007047)
文摘Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was successfully induced by D-,L-phenylalanine(Phe) and other amino acids in NaCl solution.The chiral J-aggregates showed a characteristic,induced circular dichroism(ICD) in the visible region of J-band chromophore which depends on the absolute configuration,concentration and side groups of α-amino acids,as well as temperature.The atomic force microscopy images indicated that the J-aggregates exist in large bundles of entangled nanofibers,and the observed ICD might result from the macroscopic helical arrangement of the assemblies.
基金supported by National Nature Science Foundation of China (20876070)Research and Innovation Program for Graduate Colleges and Universities of Jiangsu Province(CX09B 171Z)
文摘Optical isomers of N-lauroyl-L-（Or-D-） alanine sodium salt {C12-L-（Or-D-）AIaS} surfactants were used for the preparation of mesoporous silica nanoparticles with a twisted hexagonal rod-like morphology. Thermogravimetric analysis （TGA） was used to determine the temperature for template removal. Circular dichroism （CD） spectra of the surfactant solution with various compositions illustrated the formation and supramolecular assembly of protein-like molecular architecture leading to formation of twisted nanopar- ticles. Scanning electron microscopy （SEM）, high-resolution transmission electron microscopy （HRTEM） and X-ray powder diffraction （XRD） patterns of these as-synthesized mesoporous silica confirmed that the twisted morphology of these nanoparticles was closely related to the supramolecular-assembled complex of amino acid surfactants.
