Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.
Robert ForschnerJakob KnellesKorinna BaderCarsten MüllerWolfgang FreyAndreas KöhnYann MolardFrank GiesselmannSabine LaschatPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2019)
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.
Keyphrases
- ionic liquid
- room temperature
- solid state
- high resolution
- electron microscopy
- molecular dynamics simulations
- high speed
- single molecule
- magnetic resonance imaging
- light emitting
- photodynamic therapy
- high throughput
- computed tomography
- magnetic resonance
- single cell
- label free
- energy transfer
- crystal structure
- monte carlo