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Overview

Liquid crystals as self-assembling systems may exhibit the re-entrancy phenomena occurring due to different competing interactions.Formerly, a homolog of lactic acid derivatives nZBL was described to exhibit a re-entrant smectic A phase (SmA_RE) below the ferroelec. smectic C* phase.Herein, we synthesized and studied a selectively deuterated compound, 9ZBL-D2, analogous to the previously studied homolog showing the re-entrance phenomenon.We confirmed that the deuterated compound 9ZBL-D2 exhibits analogous mesomorphic properties including the re-entrant SmA_RE phase.We concentrated on re-entrance phenomenon as the enantiotropic character of the SmA_RE phase enabled us to elucidate the orientational order and mol. dynamics in detail.We applied dielec. measurements and deuterium NMR (²H NMR) spectroscopy, and DSC and x-ray measurements to describe the mesomorphic properties of 9ZBL-D2.The anal. of ²H NMR spectra coupled with the study of the trend of spin-lattice relaxation times was performed to investigate the phase transitions of 9ZBL-D2 sample.The exptl. data have been analyzed and discussed.

01 Jun 2025·Journal of Molecular Liquids

Induced re-entrant SmA phase in binary mixtures of lactic acid derivatives

Author: Gorecka, Ewa ; Golub, Pavlo ; Cigl, Martin ; Pociecha, Damian ; Hamplova, Vera ; Bohmova, Zuzana ; Novotna, Vladimira ; Stulov, Sergei

Re-entrance phenomenon is a unique effect, which is rare even in the field of liquid crystals.We synthesized a homolog series of lactic acid derivatives nZBBL, with one homolog showing a re-entrant smectic A (SmA_RE) phase at lower temperatures than the ferroelec. smectic C (SmC*) phase.However, neighboring homologues revealed a regular mesomorphic behavior, with only the SmA phase or with the regular SmA-SmC* phase sequence.In the presented contribution, we have prepared and pursued the binary mixtures with the aim to elucidate the re-entrance phenomenon for this mol. system.Of our studies demonstrate how the re-entrant SmA_RE phase can be stabilized with respect to the concentration of individual homologues.Dielec. spectroscopy, X-ray diffraction studies and spontaneous polarization measurements were carried out to characterize binary mixtures and establish the phase diagrams.We found out the re-entrant SmA_RE phase in binary mixtures of homologues even though neither of them showed a re-entrant behavior.The gained knowledge about the studied binary systems allowed us to tune the mesogenic properties in a predictable way.

01 Jun 2025·Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials

Modulation of the modulated magnetic structure of an Ho i-MAX phase described by a magnetic (3+2)-dimensional superspace group. Corrigendum

Author: Petříček, Václav ; Ouisse, Thierry ; Colin, Claire V ; Rosen, Johanna ; Opagiste, Christine ; Tao, Quanzheng ; Ballou, Rafik

The name of one of the authors in the article by Colin et al. [Acta Cryst. (2025), B81, 37–46] is corrected.

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Pipeline

Pipeline Snapshot as of 07 Jun 2025

The statistics for drugs in the Pipeline is the current organization and its subsidiaries are counted as organizations,Early Phase 1 is incorporated into Phase 1, Phase 1/2 is incorporated into phase 2, and phase 2/3 is incorporated into phase 3

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