The influence of bromine substitution and linking groups on the phase behaviour of light-responsive rod-like molecules

Alaasar, Mohamed; Nirgude, Tejal; Anders, Christian

doi:10.1016/j.molliq.2024.126174

Journal of Molecular Liquids

2024

DOI: 10.1016/j.molliq.2024.126174

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The influence of bromine substitution and linking groups on the phase behaviour of light-responsive rod-like molecules

Mohamed Alaasar,

Tejal Nirgude,

Christian Anders

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2024

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Manipulation of Supramolecular Chirality in Bicontinuous Networks of Bent‐Shaped Polycatenar Dimers

Cao,

Zhao,

Tan

et al. 2024

Chemistry A European J

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Bicontinuous cubic liquid crystalline (LC) phases are of particular interest due their possible applications in electronic devices and special supramolecular chirality. Herein, we report the design and synthesis of first examples of achiral bent‐shaped polycatenar dimers, capable of displaying mirror symmetry breaking in their cubic and isotropic liquid phases. The molecules have a taper‐shaped 3,4,5‐trialkoxybenzoate segment connected to rod‐like building unit terminated with one terminal flexible chain. The two segments were connected using an aliphatic spacer with seven methylene units to induce bending of the whole structure. Investigated by the small‐angle X‐ray scattering (SAXS), a double network achiral cubic phase Cub/Ia3 d, which is a meso‐structure, and a chiral triple network cubic phase Cub/I23[*] are formed. The molecules self‐assemble into molecular helices and progress along the networks. Interestingly, different linking groups such as ester or azo linkages and core fluorination lead to distinct local helicity, resulting in an alkyl chain volume dependent phase transition sequence Ia3d(L)‐I23*‐Ia3d(S). The re‐entry of Iad phase and loss of supramolecular chirality is attributed to the delicate influence of steric effect at the mono‐substitute end and interhelix interaction. Besides, aromatic core fluorination was proved to be a successful tool stabilizing the cubic phases in these dimers.

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Manipulation of Supramolecular Chirality in Bicontinuous Networks of Bent‐Shaped Polycatenar Dimers

Cao,

Zhao,

Tan

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

show abstract

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The influence of bromine substitution and linking groups on the phase behaviour of light-responsive rod-like molecules

Cited by 1 publication

References 60 publications

Manipulation of Supramolecular Chirality in Bicontinuous Networks of Bent‐Shaped Polycatenar Dimers

Manipulation of Supramolecular Chirality in Bicontinuous Networks of Bent‐Shaped Polycatenar Dimers

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