Dataset Information

Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.

ABSTRACT: Thermotropic ionic liquid crystals based on the flavylium scaffold have been synthesized and studied for their structure-properties relationship for the first time. The mesogens were probed by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). Low numbers of alkoxy side chains resulted in smectic (SmA) and lamello-columnar (LamCol ) phases, whereas higher substituted flavylium salts showed Colro as well as ordered and disordered columnar (Colho , Colhd ) mesophases. Mesophase width ranged from 13?K to 220?K, giving access to room temperature liquid crystals. The optical properties of the synthesized compounds were probed towards absorption and emission properties. Strong absorption with maxima between 444 and 507?nm was observed, and some chromophores were highly emissive with quantum yields up to 99?%. Ultimately, mesogenic and dye properties were examined by temperature-dependent emissive experiments in the solid state.

SUBMITTER: Forschner R

PROVIDER: S-EPMC6856849 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.

Forschner Robert R Knelles Jakob J Bader Korinna K Müller Carsten C Frey Wolfgang W Köhn Andreas A Molard Yann Y Giesselmann Frank F Laschat Sabine S

Chemistry (Weinheim an der Bergstrasse, Germany) 20190918 56

Thermotropic ionic liquid crystals based on the flavylium scaffold have been synthesized and studied for their structure-properties relationship for the first time. The mesogens were probed by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). Low numbers of alkoxy side chains resulted in smectic (SmA) and lamello-columnar (Lam<sub>Col</sub> ) phases, whereas higher substituted flavylium salts showed Col<sub>ro</sub> as well as ordered and ...[more]

PMID: 31418972

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Project description:We report that metal salts composed of mixtures of anions of differing coordination strength can be used to increase the sensitivity and selectivity of adsorbate-induced anchoring transitions of liquid crystals (LCs) supported on surfaces decorated with the metal salts. Specifically, the dynamics of anchoring transitions triggered by the adsorbate dimethyl methylphosphonate (DMMP) on surfaces of aluminum(III) salts were analyzed within the framework of a model for mass transport to reveal that the sensitivity of a nitrile-containing nematic LC to DMMP increased from 250 to 25 ppb when the composition of the (counter) anion was changed from 100% perchlorate to 90% nitrate and 10% perchlorate (by mole percent). To provide insight into these observations, polarization-modulation infrared reflectance-absorbance spectroscopy (PM-IRRAS) was used to show that the intensity of the absorption band in the IR spectrum corresponding to the coordinated state of the nitrile group (but not the position of the peak) decreased with the increase in the mole fraction of the strongly coordinating anion (nitrate) in the anion mixture, thus suggesting that the addition of the strongly coordinating anion decreased the number of coordination interactions (per unit area of the interface) but not the strength of the individual coordination interactions between the metal cation and the LC. We also measured the incorporation of the nitrate anion into the metal salt to decrease the effect of humidity on the dynamic response of the LC to DMMP, a result that is consistent with weaker interactions between the nitrate anion and water as compared to the perchlorate anion and water. Finally, the bidentate anion acetylacetonate was measured to cause a similar increase in sensitivity to DMMP when mixed with perchlorate in a 1:1 ratio (the resulting sensitivity of the system to DMMP was 100 ppb). Overall, these results suggest that tailoring the identity of the anion represents a general and facile approach for tuning the orientational response of LCs supported on metal salts to targeted analytes.

Dataset Information

Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.

Publications

Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.

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