Full-Color Tunable Photoluminescent Ionic Liquid Crystals Based on Tripodal Pyridinium, Pyrimidinium, and Quinolinium Salts

Synthesis, magnetism, aqueous-two phase formation and physical properties of novel guanidinium-based magnetic ionic liquids

A novel magnetic ionic liquid aqueous two-phase systems (MILATPs) has been developed, based on a series of novelly synthesized guanidinium-based magnetic ionic liquids.

[Bmim]2SbCl5: a main group metal-containing ionic liquid exhibiting tunable photoluminescence and white-light emission

Presented is an antimony-based photoluminescent material, namely [Bmim]₂SbCl₅, exhibiting bright yellow and white light photoluminescence with quantum yield as high as 86.3%.

Smectic assemblies in C₃-symmetric hexa-alkylated liquid crystals: transformation from smectogen to discogen via hydrogen bonding

In this paper, we report a C3-symmetric liquid crystal (LC) with sixfold alkyl peripheries exhibiting an unusual smectic E-like organization in the LC state. Based on conformational considerations, the smectic assembly is attributed to the formation of an endo-type Y conformer of asymmetric triazolyl and benzylic groups that cannot be accessed in other C3-symmetric molecules exclusively showing columnar assemblies. The Y conformers form a two-dimensional oblique lattice in the aromatic layers of the ordered smectic phase. In addition, the Y-shaped molecule in the smectic phases can change into a circular shape by the 1 : 1 hydrogen-bonding interaction with a gallic acid derivative, which leads to a hexagonal columnar LC phase. The triazole-based LC design concept proves the smectic LC assembly in the C3-symmetric system, and provides the supramolecular manipulation of LC morphologies.

Ionic nanoparticle networks: development and perspectives in the landscape of ionic liquid based materials

This article summarizes the research performed on ionic nanoparticle networks compared with other hybrid materials like ionogels or imidazolium modified nanoparticles.

Nonvolatile liquid anthracenes for facile full-colour luminescence tuning at single blue-light excitation

Nonvolatile room-temperature luminescent molecular liquids are a new generation of organic soft materials. They possess high stability, versatile optical properties, solvent-free fluid behaviour and can effectively accommodate dopant dye molecules. Here we introduce an approach to optimize anthracene-based liquid materials, focussing on enhanced stability, fluorescence quantum yield, colour tunability and processability, with a view to flexible electronic applications. Enveloping the anthracene core in low-viscosity branched aliphatic chains results in stable, nonvolatile, emissive liquid materials. Up to 96% efficient energy-transfer-assisted tunable emission is achieved by doping a minute amount of acceptor dye in the solvent-free state. Furthermore, we use a thermoresponsive dopant to impart thermally controllable luminescence colours. The introduced strategy leading to diverse luminescence colours at a single blue-light excitation can be an innovative replacement for currently used luminescent materials, providing useful continuous emissive layers in developing foldable devices.

Rational adjustment of multicolor emissions by cucurbiturils-based host-guest chemistry and photochemistry

The host-guest chemistry of cucurbiturils and the photochemistry of azastilbene derivatives are combined for the rationally adjusting multicolor emissions through forming different host-guest complexes and their corresponding photochemical products. Cucurbit[8]uril (CB[8]) can bind with azastilbene derivatives to form supramolecular polymers emitting orange light. The supramolecular polymers further facilitate the [2 + 2] cycloaddition of C═C bonds in azastilbenes by UV irradiation, emitting blue light. Different from CB[8], cucurbit[7]uril (CB[7]) encapsulates azastilbene derivatives to form a dumbbell-shaped host-guest complex, emitting dark-purple light. This dumbbell-shaped host-guest complex undergoes cis-isomerization after UV irradiation, thus emitting green light. Therefore, this strategy is promising for fabricating advanced stimuli-responsive fluorescent materials.

A general method to diverse cinnolines and cinnolinium salts

Rhodium catalysis: A highly efficient and general method has been established to prepare cinnolines, cinnolinium salts, and polycyclic cinnolinium salts through the rhodium(III)-catalyzed oxidative C-H activation/cyclization of azo compounds with alkynes (see scheme). Key features of this methodology include the unprecedented capacity to create both cinnoline and cinnolinium frameworks.