Regioisomeric acceptor‐donor (AD) molecular rotors (p‐AD, m‐AD and m‐ADA) were synthesized and characterized, wherein dyads p‐AD and m‐AD, and triad m‐ADA contained 4,4‐difluoro‐4‐bora‐3a,4a‐diaza‐s‐indacene (BODIPY) and benzodithiophene (BDT) as electron‐acceptor and electron‐donor, respectively. In all the compounds, the donor and acceptor moieties are electronically decoupled by a phenyl spacer, either through a para coupling or through a meta coupling. The dyad counterparts p‐AD and m‐AD showed distinct photophysical characteristics in which dyad p‐AD showed TICT band at ca. 654 nm characterized by a Stokes shift of ca. 150 nm and prominent solvatochromism. However, meta regioisomeric triad m‐ADA showed well‐defined aggregation in solution. Notably, because of the temperature‐tunable and solvent‐viscosity‐dependent emission, efficient ratiometric temperature sensing with positive and negative temperature coefficients and viscosity sensing was observed for all compounds. Interestingly, the fluorescence of dyad m‐AD (in 10/90 v/v THF/water) revealed a near‐white light emission with CIE chromaticity coordinates (x, y) of (0.32, 0.29). Furthermore, the fluorescence emission of p‐AD in THF at 0 °C also showed a near‐white light emission with chromaticity coordinates (x, y) of (0.34, 0.27). Such multifunctional rotors with readily tunable emission in the red region and prominent temperature‐ and viscosity‐sensing abilities are promising for sensing and bioimaging applications.

Structure property relationships in three donor-π-acceptor (D-π-A) type rotor dyad (pp-AD) and triads (pp-ADA and Me-pp-ADA) based on benzodithiophene and BODIPY with biphenyl spacers have been reported. Rotors pp-AD and...

Fluorescent probes are essential for imaging of Cancer cells and to track organelles inside the cells. We have synthesized three molecular rotors AIN, AINP and F-AINP based on 1-aminoindole (AI)...

With the advent of a new decade and the paradigm shift of every sphere of urban life to virtual platforms, it has become imperative for the global researcher community to channelize efforts into upgradation of the existing display‐technology. In this context, discotic liquid crystals (DLCs) are a class of self‐assembling organic materials that are recently being explored in fabricating the emissive layers of organic light emitting diodes (OLEDs). With their unique inherent structural and functional properties, they have the potential to challenge the currently prevailing OLED‐emitters. Yet the applications of this promising class of materials in OLEDs have not been comprehensively reviewed in literature till now. In this account, we present an overview of the developments in the field of luminescent DLC‐based emitters, supported by their associated photophysical phenomena and their performance parameters as emitters in fabricated OLED devices.

Donor-bridge-acceptor systems based on boron dipyrromethene (BODIPY) are attractive candidates for bio-imagining and sensing applications because of their sensitivity to temperature, micro-viscosity and solvent polarity. The optimization of the properties...