Isothermal Phase Transitions in Liquid Crystals Driven by Dynamic Covalent Chemistry

Abstract: The dynamic nature of calamitic liquid crystals is exploited to perform isothermal phase transitions driven by dynamic covalent chemistry. For this purpose, nematic (N) arrays based on aldehyde 1 were treated with different amines (A–E) in an on‐surface process, which resulted in different isothermal phase transitions. These phase transformations were caused by in situ imination reactions and are dependent on the nature of the added amine. Transitions from the N to crystal (1A, 1E), isotropic (1B), and smectic (Sm) (1C, 1D) phases were achieved, while the resulting materials feature thermotropic liquid crystal behavior. A sequential transformation from the N 1 to the Sm 1C and then to the N 1B was achieved by coupling an imination to a transimination processes and adjusting the temperature. All of these processes were well characterized by microscopic, spectroscopic, and X‐ray techniques, unlocking not only the constitutional but also the structural aspects of the phase transitions. This work provides new insights into designing constitutionally and structurally adaptable liquid crystal systems, paving the way toward the conception of programable evolutive pathways and adaptive materials.

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Isothermal Phase Transitions in Liquid Crystals Driven by Dynamic Covalent Chemistry ; day:23 ; month:05 ; year:2024 ; extent:8
Angewandte Chemie / International edition. International edition ; (23.05.2024) (gesamt 8)

Creator
Martínez, Daniel
Schlossarek, Tim
Würthner, Frank
Soberats, Bartolome

DOI
10.1002/anie.202403910
URN
urn:nbn:de:101:1-2405231431258.837336000305
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
14.08.2025, 10:47 AM CEST

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