Comment on'Compression Induced Chirality in Dense Molecular Films at the Air-Water Interface Probed by Second Harmonic Generation'

摘要

Recently,Benichou and co-workers'reported the measurement of the chirality of the Langmuir monolayer formed with the achiral stilbazolium dye molecule 4-(4-(dihexadecylami-no)styryl)-N-mefhylpyridinium iodide(DiA)probed with the in situ surface second harmonic generation linear dichroism(SHG-LD)technique.The main conclusions in this work are the following:(1)the chirality is compression induced and exists in the dense DiA Langmuir monolayer,and(2)there is significant magnetic dipole contribution to both the achiral and chiral second harmonic susceptibility terms in the dense DiA Langmuir monolayer.