Regulation and application of supramolecular gel with circularly polarized luminescence

Supermolecular gel is a three-dimensional network structure assembled by small molecules or polymers in solvents through noncovalent interaction.The emergence of system complexity occurs spontaneously during the molecular self-assembly process.A multitude of chiral molecular self-assembly systems have been engineered,facilitating the achievement of circularly polarized luminescence(CPL)through the amalgamation of chiral entities with fluorophores.Hydrogen bonding,π-πstacking,and noncovalent forces,such as host-guest interactions and Van der Waals'forces,confer upon supramolecular gels the capacity to react to diverse stimuli.Due to the flexibility of supramolecular assembly,the CPL properties of supramolecular gels have rich controllability and can be used in various applications.In this review,we summarized the examples of CPL-active supramolecular gel assembly,and further summarized the assembly environment factors and external stimuli.Furthermore,the versatility of CPL applications in supramolecular gels is demonstrated,ranging from optical devices,information encryption,biosensing and chemical sensing,and other practical applications.In conclusion,the study provides insights into the multicultural factors influencing CPL in supramolecular gels,describes their applications in various domains,and presents future perspectives in the field.

Luminescent properties and recent progress in applications of lanthanide metal-organic frameworks

Lanthanide metal-organic frameworks(Ln-MOFs), which is composed of organic bridging ligands and Ln3+ions/clusters, is an important component of luminescent MOFs. Compared with transition metal ions,lanthanide ions have a higher coordination number and abundant coordination geometry. Moreover, LnMOFs have special characteristics such as good porosity, topological diversity, high surface area and highly adjustable structure. The energy transfer(ET) process in Ln-MOFs could be easily affected by the interaction between host framework and guest, resulting in the change of luminescence intensity or color. Over the past few decades, the features of Ln-MOFs open the door to a range of incredibly important applications. However, there are few reviews on systemic summary of the various applications of Ln-MOFs. In this paper, we summarized the latest progress of Ln-MOFs applications, including the Ln-MOFs in chemical and biological sensors, optical information devices and catalysis, respectively, and discussed design mechanism. The possible problems in current research are briefly prospected, hoping to provide some helpful guidance for the future development of Ln-MOF materials.

Visualizing Material Processing via Photoexcitation-ControlledOrganic-Phase Aggregation-Induced Emission

Aggregation-induced emission(AIE)has been much employed for visualizing material aggregation and self-assembly.However,water is generally required for the preparation of the AIE aggregates,the operation of which limits numerous material processing behaviors.Employing hexathiobenzene-based small molecules,monopolymers,and block copolymers as different material prototypes,we herein achieve AIE in pure organic phases by applying a nonequilibrium strategy,photoexcitationcontrolled aggregation.This strategy enabled a dynamic change of molecular conformation rather than chemical structure upon irradiation,leading to a continuous aggregation-dependent luminescent enhancement(up to~200-fold increase of the luminescent quantum yield)in organic solvents.Accompanied by the materialization of the nonequilibrium strategy,photoconvertible self-assemblies with a steady-state characteristic can be achieved upon organic solvent processing.The visual monitoring with the luminescence change covered the whole solution-to-film transition,as well as the in situ photoprocessing of the solid-state materials.