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A new family of pyrimidine-based BF2 complexes (PB-1–4) with aggregation-induced emission (AIE) and mechanochromic luminescence properties were developed. These compounds exhibit intense fluorescence in their aggregation/solid-state resulting from their large Stokes shift and AIE. X-ray crystallographic analysis shows that the weak intermolecular interactions by fixing the molecular conformations of PB-1–4 are responsible for the intense fluorescence in solid-state. In addition to their pronounced AIE behaviour, PB-4 also exhibits a reversible chromic response to grinding, and a distinct red-shift of emission is observed. The high solid-state luminescence and grinding-stimuli response properties of these compounds make them potential candidates for smart materials. [ABSTRACT FROM AUTHOR]

Materials exhibiting multi-stimuli responsive luminescence are useful for applications in information encryption, fluorescence sensors, and optoelectronic devices. Herein, we report the development of fluorenyl-difluoroboron- β -diketonates that provide multi-stimuli responsive fluorescence. These complexes exhibit weak fluorescence in a diluted solution and aggregation-induced emission in the solid state. The solid-state emission color of these complexes can be tuned by grinding-fuming and grinding-heating cycles. Our experimental data reveal that propeller-shaped donor-acceptor structure and loose molecular packing structure induced by long alkyl chains are the key factors related to the stimuli response sensitivity. Furthermore, we demonstrate the information-process applications of these materials for use in a thermochromic logic gate device. Image 1 • Difluoroboron complexes with multi-stimuli response behavior were synthesized. • These complexes show aggregation-induced emission, mechanochromic and thermochromic properties. • These complexes were used in a thermochromic logic gate device. [ABSTRACT FROM AUTHOR]

Luminescent coordination polymers can be potential chemosensors and extensive efforts are being devoted to improve their selectivity and sensitivity. In this work, we report a new kind of fluorene‐based Tb‐CP, Tb4L6·7DMF·5H2O (Tb4L6, H2L = 4,4′‐(9,9‐dimethyl‐9H‐fluorene‐2,7‐diyl)dibenzoic acid), showing 2D network and strong blue emission. Meanwhile, Tb4L6 exhibits excellent selectivity and sensitivity for picric acid (PA). The quenching constant (Ksv) of Tb4L6 is equal to 4.5 × 104 L/mol during the concentration range of 0–30 μmol/L, which approaches the best reported CPs‐based on PA sensor up to now. Moreover, we went into depth on the possible mechanisms of luminescence quenching. [ABSTRACT FROM AUTHOR]

As an important biomarker, alkaline phosphatase (ALP) is one of the most commonly assayed enzymes in clinical practice. Here a novel turn-on fluorescent nanoswitch for ALP assay was suggested. The nanoswitch was easily constructed via two high-affinity ligands between GSH and Al3+ and PPi and Al3+ based on the difference in the affinity. The primary fluorescence of as-prepared GSH capped Cu nanoclusters (NCs) turned on first upon the Al3+ addition due to the Al3+ induced aggregation induced emission (AIE) enhancement based on the high affinity of GSH and Al3+. The presence of PPi then made Al3+ desorb from the surface of GSH capped Cu NCs due to the higher affinity of PPi and Al3+. As a result, the fluorescence of the Cu NCs was quenched. ALP could hydrolyze PPi into phosphate, destroying the PPi-Al3+ complex and releasing Al3+. Thus, the Al3+ binds to GSH again and the fluorescence was restored. The nanoswitch was demonstrated to be sensitive and selective for ALP assay and was successfully used for the ALP assay in the human serum. Image 1 • A luminescence turn on Cu NCs-based nanoswitch for ALP assay was proposed. • The developed nanoswitch was based on Al3+-PPi interaction and Cu NCs with AIE properties. • The proposed nanoswitch was cheap, sensitive, selective and high stability with a LOD of 0.15 U/L. • The nanoswitch was successfully used for the ALP assay in the human serum. [ABSTRACT FROM AUTHOR]

The development of small organic CPL-active molecules with large luminescent dissymmetry factors and high quantum yields is highly demanded due to their promising applications in chiroptical devices and sensors. In this paper, we report the synthesis and the chiral optical properties of a series of axial chiral triarylborane dyes. These dyes were facile synthesized by direct borylation of commercially available enantiopure binaphthalenes, and display intense CPL with moderate luminescent dissymmetry factors and high quantum yields in both solution and solid-state, which enable them as efficient CPL emitters. Moreover, fluoride-controlled fluorescence and CPL signals of these dyes were realized, demonstrating their potential application as CPL sensors. • CPL-active triarylborane dyes (BM1-2) were facile synthesized. • BM1-2 show intense CPL both in solution and in solid-state. • Fluoride-controlled fluorescence and CPL signals of BM1-2 were achieved. [ABSTRACT FROM AUTHOR]