Highlights on the Road towards Highly Emitting Solid‐State Luminophores: Two Classes of Thiazole‐Based Organoboron Fluorophores with the AIEE/AIE Effect

Abstract

Developing a novel, small-sized molecular building block that may be capable of emitting light in the solid state is a challenging task and has rarely been reported in the literature. BF -containing dyes seem to be promising candidates towards this aim. Two series of new N^NBF complexes showing aggregation-induced emission (AIE) and aggregation-induced emission enhancement (AIEE) were designed and synthesized by means of a new protocol, which improved on the traditional method by employing microwave irradiation. The optical and photophysical properties of the BF complexes were investigated in depth. The synthesized complexes showed fluorescence in both solution and the solid state and, in a mixture of tetrahydrofuran/water, may aggregate into fluorescent nanoparticles. The experimental investigation was supported by quantum mechanical calculations. Their availability, stability, large Stokes shifts, and aggregation capabilities, along with their solid-state emission capability, render this new class of BF complexes promising AIEE/AIE fluorophores for further applications in the fields of fluorescence imaging and materials science.

Retracted Article: Facile preparation of bithiazole-based material for inkjet printed light-emitting electrochemical cell

“…The sensitivity of the emission to the polarity of the solvent is benecial for an intramolecular charge transfer (ICT)-like emission. 53 This difference probably accounts for the high concentration of donor units in the bithiazole backbone, low rates of intersystem crossing to reactive triplet states. 48,54 Consequently, the composite 1c was the best performing LEC and chosen for the below test.…”

Deciphering the Dynamics of Organic Nanoaggregates with AIEE Effect and Excited States: Lipophilic Benzothiadiazole Derivatives as Selective Cell Imaging Probes

“…The rotating units (Ph groups) of this structure are able to rotate in diluted solutions and, therefore, a nonemissive pathway is the preferential relaxation process. When the aggregation takes place, these molecular motions are blocked by intermolecular interactions and the emission from a radioactive pathway is favored, as confirmed for several small organic molecules and derivatives with the AIE effect. − After these findings, aggregation-induced emission enhancement (AIEE) luminophores were brought to a prominent position among small organic molecules. − The enhancement of light emissions upon aggregation may also afford bathochromic or hypsochromic shifts, thus allowing the color tuning for specific applications.…”

Aggregation-induced emission enhancement (AIEE)-active boron-difluoride dyes with reversible mechanochromic fluorescence

“…13 Fluorescent dyes with AIEE properties have many advantages for practical application in the elds of analytical detection, uorescence imaging and luminescent devices. For AIEE-active boron-diuoride dyes, non-pyrrolebased ligands with asymmetrical structures were normally adopted, such as b-diketone or N-substituted b-diketone derivatives, [14][15][16][17][18] b-iminoenolate derivatives [19][20][21][22][23][24][25][26][27] and others. [28][29][30][31][32][33][34][35] All these dyes bear rotatable bulky aromatic groups, which promotes the non-irradiative decay in dilute solutions.…”