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Updated: Aug 11, 2025

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Photoluminescent ellipsometric circular dichroism
Gustavo Gonçalves Dalkiranis1, Fernando Costa Basílio2, Roberto S Nobuyasu3
1Physics Institute of São Carlos, University of São Paulo, 13560-970 São Carlos, SP, Brazil; Catalan Institute of Nanoscience and Nanotechnology (ICN2), Edifici ICN2, Campus UAB, 08193, Bellaterra, Barcelona, Spain.
Abstract:
A novel spectroscopic technique, photoluminescent ellipsometric circular dichroism (PECD), which distinguishes all radiative electronic transitions related to molecular chiral centers. Additionally, it is proposed as complementary to the ellipsometric Raman spectroscopy (ERS) technique, thus establishing a relationship between vibrational modes and electronic transitions, associated with molecular chiral centers. In this way, PECD turns into a powerful technique for chiral material characterization. The PECD technique was performed on a chiral oligomer (1R,2R)-diiminocyclohexane, and its derivative polymer. A complete photophysical characterization in solution was performed to corroborate the new PECD technique.
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