White light emitting (WLE) materials are of increasing interesto wing to their promising applicationsi na rtificial lighting, display devices, molecular sensors, and switches.I n this context,o rganic WLE materials cater to the interesto f the scientific community owing to their promising features like color purity,l ong-term stability,s olutionp rocessability, cost-effectiveness,a nd low toxicity.T he typical methodf or the generation of white light is to combine three primary (red, green, and blue) or the two complementary (e.g., yellow and blue or red and cyan) emissive units covering the whole visible spectralw indow (400-800 nm). The judicious choice of molecular buildingb locks and connecting them through either strong covalentb onds or assembling through weakn oncovalent interactions are the key to achieve enhanced emissions panning the entire visible region.In the present review article, moleculare ngineering approaches for the development of all-organic WLE materials are analyzed in view of different photophysical processes like fluorescencer esonance energy transfer (FRET), excitedstate intramolecular protont ransfer (ESIPT), charget ransfer (CT), monomer-excimer emission, triplet-state harvesting, etc. The key aspect of tuning the molecular fluorescence under the influence of pH, heat, and host-guest interactions is also discussed. The white light emission obtained from small organic molecules to supramolecular assemblies is presented,i ncluding polymers, micelles,a nd also employing covalent organic frameworks. The state-of-the-art knowledge in the field of organic WLE materials, challenges, and future scope are delineated.

Porous organic frameworks (POFs) with heteroatom rich ionic backbone have emerged as advanced materials for catalysis, molecular separation, and antimicrobial applications. The loading of metal ions further enhances Lewis acidity,...

Porous organic polymers (POPs) have received increasing attention due to their properties, such as permanent porosity with tunable pore size, robust structure, high surface area, and versatility of the backbone...

Macrocyclic cavitands having aesthetically appealing architectures and excellent host−guest complexation abilities exhibit a broad range of applications from molecular separation, catalysis, and sensing to drug delivery. However, the close packing of the zero-dimensional (0D) porous cavitands reduces their activity in the solid state. Knitting the macrocyclic cavitands using suitable aromatic linkers may lead to a new generation of porous organic polymers (POPs) where the intrinsic properties of the cavitands can be augmented through interconnected pores in the solid state. Herein, we demonstrate the design strategy of linking the 0D-discrete pores by connecting Cphenylresorcin[4]arene (RN4) through three different aromatic linkers. The flexible azo linkers generate highly dispersible hierarchically mesoporous POP (RN4-Az-OH) exhibiting a remarkable catalytic activity toward metal-free cycloaddition of CO 2 with epoxides under solvent-free reaction conditions. Alkyne-based rigid linkers lead to microporous polymer (RN4-OH), which shows CO 2 and H 2 uptake at low pressure. The fluorine-rich linkers produce ultramicroporous hydrophobic POP (RN4-F) exhibiting high efficiency toward the charge-specific size-selective removal of organic micropollutants from water. Resorcin[4]arene-derived POPs show superior performance compared to the pristine 0D-porous building units. Thus, "connecting the dots" (0D pores) gives rise to a new interface between supramolecular chemistry and porous organic materials, which can be explored further to address the challenging problems related to green energy and environmental remediation.

Nanostructured hypercrosslinked porous organic polymers have triggered immense research interest for a broad spectrum of applications ranging from catalysis to molecular separation. However, it still remains a challenge to tune their nanoscale morphology. Herein, we demonstrated a remarkable variation of morphologies of triptycene-based hypercrosslinked microporous polymers starting from irregular aggregates (FCTP) to rigid spheres (SCTP) to two-dimensional nanosheets (SKTP) from three distinct polymerization methodologies, Friedel–Crafts knitting using an external crosslinker, Scholl reaction, and solvent knitting, respectively. Further, the dramatic role of reaction temperatures, catalysts, and solvents resulting in well-defined morphologies was elucidated. Mechanistic investigations coupled with microscopic and computational studies revealed the evolution of 2D nanosheets of a highly porous solvent-knitted polymer (SKTP, 2385 m2 g–1), resulting from the sequential hierarchical self-assembly of nanospheres and nanoribbons. A structure–activity correlation of hypercrosslinked polymers and their sulfonated counterparts for the removal of toxic polar organic micropollutants from water was delineated based on the chemical functionalities, specific surface area, pore size distribution, dispersity, and nanoscale morphology. Furthermore, a sulfonated 2D sheet-like solvent-knitted polymer (SKTPS) exhibited rapid adsorption kinetics (within 30 s) for a large array of polar organic micropollutants, including plastic components, steroids, antibiotic drugs, herbicides, and pesticides with remarkable uptake capacity and excellent recyclability. The current study provides the impetus for designing morphology-controlled functionalized porous polymers for task-specific applications.