Handedness inversion of chiral mesoporous silica: A diffuse-reflectance circular dichroism study |
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| Authors: | Nan Wang Ruiyu Lin Minzhao Xue Yingying Duan Shun&#x;ai Che |
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| Institution: | a School of Chemistry and Chemical Engineering, State Key Laboratory of Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China;
b School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Chiral mesoporous silica ribbons and rods with inversed handedness have been synthesized with the same enantio pure N-acylaminoacidat temperatures of 0 °C and 20 °C, respectively. With involving Cu2+ and meso-tetra(4-sulfonatophenyl)porphyrin (TPPS) as probes, ribbons and rods revealed opposite signals in diffuse-reflectance circular dichroism (DRCD) spectra, indicating the existence of inversed supramolecular chiral imprintings through helical stacking of amphiphiles. The structural evolution was systematically studied by the freeze-dried products sampled at different time after the addition of silica precursors. The H-bonding-depended molecular orientation probably controls the chiral sense upon forming chiral molecular stacking, which would be the origin of such handedness inversion phenomenon |
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| Keywords: | Chirality Handedness inversion Circular dichroism Mesoporous Amphiphile Self-assembly |
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