Issue 11, 2024

Effect of the linking bridge type on the self-assembly behaviour of 2′,3′-difluoroterphenyl derivatives

Abstract

The self-assembly behaviour and the crystallization kinetics of two liquid crystal compounds containing 2′,3′-difluorosubstituted terphenyl as the mesogenic core have been described. Calorimetric studies show that the linking bridge type affects the polymorphism of smectic phases. The CH2O.3 compound with the –CH2O– linking bridge connected with a longer methylene spacer possesses the chiral smectic phase with antiferroelectric properties (SmCA* phase), while the COO.6 liquid crystal with the –COO– linking bridge connected with a shorter alkyl chain forms the chiral smectic phase with ferroelectric properties (SmC* phase). Both compounds crystallize upon slow cooling, while fast cooling causes the vitrification of the conformationally disordered crystal phase. Dielectric measurements reveal the complex relaxation dynamics in the identified thermodynamic states. DFT calculations allow us to estimate the nature of relaxation processes.

Graphical abstract: Effect of the linking bridge type on the self-assembly behaviour of 2′,3′-difluoroterphenyl derivatives

Article information

Article type
Paper
Submitted
11 Jan 2024
Accepted
19 Feb 2024
First published
28 Feb 2024

Phys. Chem. Chem. Phys., 2024,26, 8748-8760

Effect of the linking bridge type on the self-assembly behaviour of 2′,3′-difluoroterphenyl derivatives

A. Drzewicz, M. Jasiurkowska-Delaporte, P. Kula and E. Juszyńska-Gałązka, Phys. Chem. Chem. Phys., 2024, 26, 8748 DOI: 10.1039/D4CP00133H

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