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Aggregation-Induced Resonance Raman Optical Activity (AIRROA): A New Mechanism for Chirality Enhancement
journal contribution
posted on 2016-04-08, 00:00 authored by Grzegorz Zajac, Agnieszka Kaczor, Ana Pallares Zazo, Jacek Mlynarski, Monika Dudek, Malgorzata BaranskaRaman
optical activity (ROA) spectroscopy is hampered by low sensitivity,
with limited possibilities for enhancing the signal. In the present
study, we report a new mechanism whereby chirality is enhanced using
the resonance resulting from supramolecular aggregation. We have named
this mechanism aggregation-induced resonance Raman optical activity
(AIRROA). As an example, we study J-aggregates of astaxanthin (AXT),
which show strong absorption of circularly polarized light in the
range of ROA excitation. The implications of aggregation-induced signal
enhancement for chiroptical spectroscopy are discussed.