All Optical Determination
of Microscopic and Macroscopic
Structure of Chiral, Polar Microcrystals from Achiral, Nonpolar Molecules
Stijn Van Cleuvenbergen
Gunther Hennrich
Pieter Willot
Guy Koeckelberghs
Koen Clays
Thierry Verbiest
Monique A. van der Veen
10.1021/jp302665t.s001
https://acs.figshare.com/articles/journal_contribution/All_Optical_Determination_of_Microscopic_and_Macroscopic_Structure_of_Chiral_Polar_Microcrystals_from_Achiral_Nonpolar_Molecules/2515756
Organic microcrystals obtained from an octupolar molecule
are studied
by polarized nonlinear optical microscopy. While two-photon fluorescence
microscopy is employed to verify the monocrystallinity of the analyzed
domains, second-harmonic generation microscopy allowed determination
of the point group symmetry of the crystallites. This combined analysis
revealed that the achiral, octupolar molecules form chiral and polar
conglomerate structures; the former are confirmed by circular dichroism
spectroscopy. We additionally present a convenient and straightforward
image analysis protocol, based on polarization dependent second-harmonic
generation microscopy. This allows assessing the local organization
and homogeneity of crystalline structures, which is highly relevant
for technological applications, with high resolution and sensitivity.
2012-06-07 00:00:00
generation
Polar Microcrystals
dichroism spectroscopy
octupolar molecule
Macroscopic Structure
image analysis protocol
conglomerate structures
octupolar molecules form chiral
Optical Determination
microscopy
Nonpolar MoleculesOrganic microcrystals
point group symmetry