Four isostructural inorganic−organic hybrid ferroelectric compounds, assembled from achiral 3-R-benzylidene-1-aminopyridiniums (R = NO2, Br, Cl, or F for 1−4, respectively) and [PbI3]− anions with the chiral Kagomé-shaped tubular aggregating architecture, show larger spontaneous polarizations.
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Zhao et al. (2009) studied this question.
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