Aggregation-induced emission of tetraphenylethene-hexaphenylbenzene adducts: Effects of twisting amplitude and steric hindrance on light emission of nonplanar fluorogens

摘要

A series of nonplanar tetraphenylethene (TPE)-hexaphenylbenzene (HPB) adducts was designed and synthesized by Diels-Alder reaction of the acetylene precursors and tetraphenylcyclopentadienone. All of the adducts showed aggregation-induced emission features. The twisting amplitude and steric hindrance of the TPE and HPB units were found to play a crucial role in their fluorescence behaviors in the aggregated state. Nonplanar fluorogens: A series of nonplanar tetraphenylethene and hexaphenylbenzene adducts was designed and synthesized (see scheme) to study the aggregation-induced emission process. The twisting amplitude and steric effect of the units were found to be crucial in the fluorescence behavior of the luminogens.