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    Chiral supramolecular organization from a sheetlike achiral gel: a study of chiral photoinduction

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    Chiral photoinduction in a photoresponsive gel based on an achiral 2D architecture with high geometric anisotropy and low roughness has been investigated. Circularly polarized light (CPL) was used as a chiral source and an azobenzene chromophore was employed as a chiral trigger. The chiral photoinduction was studied by evaluating the preferential excitation of enantiomeric conformers of the azobenzene units. Crystallographic data and density functional theory (DFT) calculations show how chirality is transferred to the achiral azomaterials as a result of the combination of chiral photochemistry and supramolecular interactions. This procedure could be applied to predict and estimate chirality transfer from a chiral physical source to a supramolecular organization using different light-responsive units.This work was supported by the Ministerio de Economia y Competitividad, under the project MAT2014-55205-P, Fondo Europeo de Desarrollo Regional (FEDER) and Gobierno de Aragon. The authors acknowledge the Laboratory of Advanced Microscopy Laboratory (LMA) of the Universidad de Zaragoza (Unizar) and CEQMA (CSIC-Unizar) for the NMR, MS, EA and thermal analysis general facilities. The authors additionally acknowledge the use of the Servicio General de Apoyo a la Investigacion of the Universidad de Zaragoza. General Research Services SGIker technical support from UPV/EHU (MEC, GV/EJ, European Social Fund) is gratefully acknowledged.Peer reviewe
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