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Issue 3, 2020
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Photoconductive bent-core liquid crystalline radicals with a paramagnetic polar switchable phase

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Abstract

A series of self-organizing bent-core derivatives 1[12,n], containing a highly π-delocalized stable radical as the central angular structural element, is described. The planarity of the open-shell core permits efficient π–π stacking, which results in the formation of B2 and soft crystalline phases above 100 °C. Optical, XRD and dielectric analyses of 1[12,12] indicate that the ground state of the observed B2 phase is polar antiferroelectric of type SmCAPA exhibiting tristable electro-optical switching. SQUID and EPR measurements revealed strong antiferromagnetic spin–spin exchange interactions below the isotropic phase, which have been estimated at θ = −46 cm−1 with the Curie–Weiss law. Transient photoconductivity was observed in the B2 phase with a hole carrier mobility μh of 1.4 × 10−4 cm2 V−1 s−1.

Graphical abstract: Photoconductive bent-core liquid crystalline radicals with a paramagnetic polar switchable phase

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Article information


Submitted
21 Oct 2019
Accepted
02 Dec 2019
First published
03 Dec 2019

J. Mater. Chem. C, 2020,8, 1083-1088
Article type
Paper

Photoconductive bent-core liquid crystalline radicals with a paramagnetic polar switchable phase

K. I. Shivakumar, D. Pociecha, J. Szczytko, S. Kapuściński, H. Monobe and P. Kaszyński, J. Mater. Chem. C, 2020, 8, 1083
DOI: 10.1039/C9TC05764A

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