Hetero‐aggregation‐induced Tunable Emission (HAITE) Through Cocrystal Strategy

Huang, Yinjuan; Zhang, Qichun

doi:10.1002/9781119643098.ch10

Cited by 1 publication

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“…Aggregation of luminophores leads to two different effects on photoluminescence (PL): ACQ and aggregation-induced emission (AIE). , AIE, a rare phenomenon, provides a promising solution to the obstacles for the development of luminescent materials and extended their application scope . Since the recent discovery of AIE, the phenomenon is being vigorously researched by scientists all over the world. , The AIE is significantly reported for single- and small-molecule dyes with great structural diversity for huge potential applications. − Furthermore, the AIE effect has also achieved much progress in macromolecule polymers to fabricate them into smart materials and devices. − However, AIE in the two component crystals, termed as hetero-aggregation-induced tunable emission (HAITE), is not well reported. The development of co-crystal systems through HAITE effect to tune photophysical properties is challenging for uncertain integrity of these solids in the solution phase.…”

Section: Introductionmentioning

confidence: 99%

“…72−77 Furthermore, the AIE effect has also achieved much progress in macromolecule polymers to fabricate them into smart materials and devices. 78−81 However, AIE in the two component crystals, termed as heteroaggregation-induced tunable emission (HAITE), 82 is not well reported. The development of co-crystal systems through HAITE effect to tune photophysical properties is challenging for uncertain integrity of these solids in the solution phase.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hetero-Aggregation-Induced Tunable Emission in Multicomponent Crystals

et al. 2023

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Crystal engineering is a green and convenient approach to designing desirable materials through rational manipulation of intermolecular interactions. We have reported the lesser reported sulfonate–pyridinium intermolecular interaction for the design and synthesis of organic co-crystals with improved features. Here in we report the utilization of the interaction to tune the solid-state luminescence of organic precursor naphthalene disulfonic acid (NDSA-2H). Organic salts of NDSA-2H are synthesized and characterized with three isostructural bipyridyl co-formers: 4-phenylpyridine (4-PhPy), 2-phenylpyridine (2-PhPy) and 2,2′-bipyridine (2,2-bpy). Structural investigation validates aggregation of organic acid and base co-formers through sulfonate–pyridinium synthon and proton transfer between them. Compared to NDSA-2H, the molecular salts [(4-PhPy-H)2 +(NDSA)2–·2H2O] (1) and [(2,2-BPY-2H)2 +(NDSA)2–] (3) undergo a blue and red shift, respectively, while solid-state emission of [(2-PhPy-H)2+(NDSA)2–] (2) remains unaltered. This solid-state emission tuning is attributed to the different modes of crystal packing and arises from monomer emissions in 1 and 2 and excimer emission in 3. 3 also exhibits a relatively longer lifetime of 20.7 ns while 2 exhibits better quantum yields (ϕ = 22.7). Solution-phase photophysical behavior has been investigated for representative co-crystal system 3, after validation of its solution-phase integrity. 3 undergoes a hetero-aggregation-induced tunable emission (HAITE) phenomenon in the water–acetone system to exhibit maximum emission intensity at 90% volume fraction of acetone, which is further validated by the diffuse light scattering (DLS) and scanning electron microscopy (SEM) studies. 3 also exhibits solvatochromism in terms of emission intensity change with the nature of the solvent, being brightest in methanol (ϕ = 29.3) and very dim in water (ϕ = 10.1).

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