lost its AIE upon photoisomerization due to the absence of host–guest interaction.
1 H NMR, DOSY NMR, and fluorescence studies of the supramolecular
polymers before and after UV irradiation clearly indicated the significant role of
photostable host–guest interaction in enhancing and retaining AIE. In addition,
strong host–guest interaction played a key role in retaining the polymeric
assembly and AIE, which is an interesting finding. The current study provides
a new strategy to preserve the AIE activity of photoresponsive cyanostilbene
derivatives.
Yang et al. (2017) [44] reported the facile preparation of photoresponsive
supramolecular polymers by the assembly of stiff-stilbene-based guests (Z-G/
E-G) and a bispillar[5]arene (H), seen in Fig. 19. The 1:1 mixture of Z-G and
H assembled into oligomers at 5–150 mM. In contrast, the 1:1 mixture of E-G
and H assembled into AA/BB-type supramolecular polymers following a ringchain polymerization mechanism. The assembly behavior between the host and
guest molecules was regulated by the photoisomerization of the stiff stilbene
units in guest molecules. The formation and disassembly of the AA/BB supramolecular polymer were reversible by alternating irradiation between 387 nm
and 360 nm light. The light responsive pillar [5]arenes based AA/BB-type
supramolecular polymers may have potential applications in biomaterials.
Fig. 17 Cartoon representation of the formation of the fluorescent supramolecular polymer
based on orthogonal host–guest association and metal ion coordination. (Reprinted with permission
from [41]. Copyright (2015) Royal Society of Chemistry)
16 Photoresponsive Supramolecular Polymers Based on Host-Guest Interactions
473
1 H NMR, DOSY NMR, and fluorescence studies of the supramolecular
polymers before and after UV irradiation clearly indicated the significant role of
photostable host–guest interaction in enhancing and retaining AIE. In addition,
strong host–guest interaction played a key role in retaining the polymeric
assembly and AIE, which is an interesting finding. The current study provides
a new strategy to preserve the AIE activity of photoresponsive cyanostilbene
derivatives.
Yang et al. (2017) [44] reported the facile preparation of photoresponsive
supramolecular polymers by the assembly of stiff-stilbene-based guests (Z-G/
E-G) and a bispillar[5]arene (H), seen in Fig. 19. The 1:1 mixture of Z-G and
H assembled into oligomers at 5–150 mM. In contrast, the 1:1 mixture of E-G
and H assembled into AA/BB-type supramolecular polymers following a ringchain polymerization mechanism. The assembly behavior between the host and
guest molecules was regulated by the photoisomerization of the stiff stilbene
units in guest molecules. The formation and disassembly of the AA/BB supramolecular polymer were reversible by alternating irradiation between 387 nm
and 360 nm light. The light responsive pillar [5]arenes based AA/BB-type
supramolecular polymers may have potential applications in biomaterials.
Fig. 17 Cartoon representation of the formation of the fluorescent supramolecular polymer
based on orthogonal host–guest association and metal ion coordination. (Reprinted with permission
from [41]. Copyright (2015) Royal Society of Chemistry)
16 Photoresponsive Supramolecular Polymers Based on Host-Guest Interactions
473