Observation of helical self-assembly in cyclic triphosphazene-based columnar liquid crystals bearing chiral mesogenic units

Rani, Shruti; Punjani, Vidhika; Gupta, Santosh Prasad; Kanakala, Madhu B.; Yelamaggad, C. V.; Pal, Santanu Kumar

doi:10.1039/d2tc03847a

J. Mater. Chem. C

2023

DOI: 10.1039/d2tc03847a

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Observation of helical self-assembly in cyclic triphosphazene-based columnar liquid crystals bearing chiral mesogenic units

Shruti Rani

Vidhika Punjani

Santosh Prasad Gupta

et al.

Abstract: Nowadays, intensive research has focused on the design and synthesis of function-integrated smart materials resulting from the spontaneous self-assembly of the predestined functional molecules. Working in this direction, we have...

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Cited by 9 publications

References 65 publications

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Tailoring Chiral Discotic Liquid Crystals: Mesophase Engineering through Alternative Approaches and Chain Lengths

Maity,

Bala,

Kanakala

et al. 2023

Chemistry An Asian Journal

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Hydrogen (H)‐bonding is crucial in constructing superstructures in chemical (such as chiral discotic liquid crystals (DLCs)) as well as in biological systems due to its specific and directional nature. In this context, we achieved the successful synthesis of two branches of heptazine‐based H‐bonded complexes using distinct strategies. Hpz*‐Es‐Cn, we incorporated chiral alkyl tails (Hpz‐chiral) onto the central C3 symmetric heptazine core, connected to achiral benzoic acid derivatives (Es‐Cn acid) through H‐bonding. In Hpz‐Es‐Cn‐acid*, we used an achiral heptazine derivative (Hpz‐Es‐Cn) linked to a chiral acid via H‐bonding. On the other hand, based on the DSC results, we observed that Hpz*‐Es‐Cn complexes exhibited three distinct phases, whereas Hpz‐Es‐Cn‐acid* complexes displayed only a single mesophase. In polarized optical microscopy (POM) observations, all the complexes displayed birefringence at room temperature, with the color of the POM images changing as the temperature varied. X‐ray diffraction (XRD) studies at lower temperatures confirmed that Hpz*‐Es‐C8 exhibited the columnar rectangular (Colr) phase, while Hpz*‐Es‐C10/12 exhibited the columnar oblique (Colob) phase. However, all the H‐bonded complexes exhibited the columnar hexagonal (Colh) phase at higher temperatures. The chiroptical spectra recorded by Circular dichroism (CD) highlight the specific observations in the columnar phase of two complexes, Hpz*‐Es‐C10 and Hpz*‐Es‐C12. This behavior has potential applications in various fields, including sensors, displays, and responsive materials.

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Tailoring Chiral Discotic Liquid Crystals: Mesophase Engineering through Alternative Approaches and Chain Lengths

Maity,

Bala,

Kanakala

et al. 2023

Chemistry An Asian Journal

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New cyclotriphosphazenes with butylated oxyanisole motif; synthesis, characterization and biological properties

Bilal Sönmez,

Şahin Ün,

Mutlu Balcı

et al. 2024

Inorganica Chimica Acta

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(2-Furanylmethyl)spiro(N/N)cyclotriphosphazenes and some quaternized derivatives: syntheses, structural elucidation and free radical scavenging activity studies

Akbaş

2024

Inorganica Chimica Acta

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Observation of helical self-assembly in cyclic triphosphazene-based columnar liquid crystals bearing chiral mesogenic units

Abstract: Nowadays, intensive research has focused on the design and synthesis of function-integrated smart materials resulting from the spontaneous self-assembly of the predestined functional molecules. Working in this direction, we have...

Cited by 9 publications

References 65 publications

Tailoring Chiral Discotic Liquid Crystals: Mesophase Engineering through Alternative Approaches and Chain Lengths

Tailoring Chiral Discotic Liquid Crystals: Mesophase Engineering through Alternative Approaches and Chain Lengths

New cyclotriphosphazenes with butylated oxyanisole motif; synthesis, characterization and biological properties

(2-Furanylmethyl)spiro(N/N)cyclotriphosphazenes and some quaternized derivatives: syntheses, structural elucidation and free radical scavenging activity studies

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