Abstract
The synthesis and photoluminescence properties of crystal crosslinked gels (CCGs) with an aggregation-induced emission (AIE) active crosslinker derived from tetraphenylethene (TPE) is discussed in this article. The CCG was prepared from a metal organic framework (MOF) with large pore aperture to allow the penetration of TPE crosslinker. The obtained CCG possessed a rectangular shape originated from the parent MOF, KUMOF. The CCG showed stimuli-responsive photoluminescence behavior depending on the swelling degree, thus the photoluminescence intensity was higher at higher swelling degree. By changing the solvent, water content, or ionic strength, the photoluminescence intensity was controllable, accompanying the change of swelling degree. Moreover, emission color tuning was also achieved by the introduction of luminescent rare earth ions to form a coordination bonding with residual carboxylate inside the CCG.
Highlights
Aggregation-induced emission (AIE) dyes have recently become a new class of functional luminescent materials, because of their useful and attractive property wherein strong luminescence is observed in aggregated or solid states, while no or weak luminescence is observed in the dissolved state [1,2,3,4,5,6]
The restriction of intramolecular motion (RIM) process of densely packed aromatic rings is widely accepted to be a predominant cause of the AIE property
As the environment to facilitate the RIM process of an AIE dye without aggregate formation, we focused on the use of a polymer gel and an elastomer consisting of network polymers crosslinked by an AIE dye [19,20,21,22]
Summary
Aggregation-induced emission (AIE) dyes have recently become a new class of functional luminescent materials, because of their useful and attractive property wherein strong luminescence is observed in aggregated or solid states, while no or weak luminescence is observed in the dissolved state [1,2,3,4,5,6]. Other ways of providing the RIM process can trigger AIE, other than aggregate formation. This idea has been realized by designing supramolecular interaction to suppress the molecular motion of AIE dye [16,17,18]. Song et al reported the occurrence of monomeric fluorescence via complexation between a TPE derivative and γ-cyclodextrin
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