Abstract
A novel aggregation-induced emission (AIE)-active liquid crystal of DC-DBM bearing rod-like dicyanodistilbenic (DC) core and alky chain was synthesized by Knoevenagel condensation reaction. It shows remarkable AIE and liquid crystal properties, and undergoes obvious mechano- and thermo- fluorochromic behaviors. The color of DC-DBM changed from green to light-yellow after grinding, and returned after fuming with organic solvent under UV light. It also took a smart response upon temperature accompanying with obvious change of colors. The force and temperature responsive phenomena were all associated with changes in the modes of molecular packing and phase states. The stimuli-responsive mechanism were unveiled by powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC). Moreover, DC-DBM displayed electro-tunable character of luminescence after mixing it with the nematic liquid crystal of 5CB. The fluorescent emission intensity with voltage showed a linear relationship from 10 to 30 V. The results showed that the AIE-active liquid crystal was a multi-function fluorescence material, which could be used in the fields of mechano-sensors, temperature detectors, security encryption and displays.
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