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Atomistic liquid crystalline structures of discotic bent-core-like mesogens formed by hydrogen bonding and interchain interactions

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Abstract

Integrated atomistic and molecular dynamic simulations are used to characterize the role hydrogen bonding and interchain interactions on structures and phase transitions of novel bent-core-like mesogenic materials that exhibit new self-assembly features, attractive to the development of functional materials. Multi-step simulations were carried out to model phase transitions and various spectra of two complex mesogenic materials formed from acid functionalized azo compounds, 4-[2,3,4-tri(octyloxy)phenylazo] benzoic acid and 4-[2,3,4- tri(heptyloxy)phenylazo] benzoic acid. The simulations contain three consecutive steps, involving molecular quantum chemistry, molecular crystal packing, and super cell molecular dynamics calculations. These two mesogens are supposed to form phasmidic molecular conformers. However, simulations point to the formation of complex discotic bent-core-like liquid crystals with tetramer mesogenic assemblies, in very good agreement with experimental observations. The wide range agreements between simulations and experimental results include transitions of crystal structures to columnar and uniaxial nematic phases, x-ray diffraction patterns of columnar phases, the structure of the two-dimensional complex bent-core-like tetramers, molecular Raman spectra, Raman depolarization spectra, and order parameters of nematic phases. The multi-step simulation methodology and its results shed light on this unique behaviour of plasmids with flexible side chains for simulation design of novel bent-core-like mesogenic materials.

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Authors and Affiliations

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, Jilin, People’s Republic of China

    Xuanchen Dong

  2. Jilin Provincial Key Laboratory for Numerical Simulation, Jilin Normal University, Siping, 136000, Jilin, People’s Republic of China

    Ming Wang, Qi He, Anqi She & Yanhua Dong

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  1. Xuanchen Dong
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  2. Ming Wang
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  3. Qi He
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  4. Anqi She
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  5. Yanhua Dong
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Correspondence to Yanhua Dong.

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Dong, X., Wang, M., He, Q. et al. Atomistic liquid crystalline structures of discotic bent-core-like mesogens formed by hydrogen bonding and interchain interactions. J Mol Model 26, 308 (2020). https://doi.org/10.1007/s00894-020-04561-8

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  • DOI: https://doi.org/10.1007/s00894-020-04561-8

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