Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
Langmuir. 2013 Oct 22;29(42):12909-14. doi: 10.1021/la4025102. Epub 2013 Aug 8.
The host-guest chemistry of cucurbiturils and the photochemistry of azastilbene derivatives are combined for the rationally adjusting multicolor emissions through forming different host-guest complexes and their corresponding photochemical products. Cucurbit[8]uril (CB[8]) can bind with azastilbene derivatives to form supramolecular polymers emitting orange light. The supramolecular polymers further facilitate the [2 + 2] cycloaddition of C═C bonds in azastilbenes by UV irradiation, emitting blue light. Different from CB[8], cucurbit[7]uril (CB[7]) encapsulates azastilbene derivatives to form a dumbbell-shaped host-guest complex, emitting dark-purple light. This dumbbell-shaped host-guest complex undergoes cis-isomerization after UV irradiation, thus emitting green light. Therefore, this strategy is promising for fabricating advanced stimuli-responsive fluorescent materials.
葫芦脲和吖啶衍生物的主客体化学相结合，通过形成不同的主客体配合物及其相应的光化学反应产物，实现了多色发射的合理调节。葫芦[8]脲（CB[8]）可以与吖啶衍生物结合形成发射橙光的超分子聚合物。超分子聚合物通过紫外线照射进一步促进吖啶化合物中 C═C 键的[2+2]环加成，发出蓝光。与 CB[8]不同，葫芦[7]脲（CB[7]）包封吖啶衍生物形成哑铃形主客体配合物，发射深紫色光。这种哑铃形主客体配合物在紫外线照射后发生顺式异构化，从而发射绿光。因此，该策略有望用于制备先进的刺激响应荧光材料。
