摘要
Tetraphenylporphyrin(TPP)isatypicalred-emittingluminogenshowingevidentaggregationcausedquenching(ACQ)effect.Toenhanceitsemissionefficiencyinsolidstate,fourtetraphenylethene(TPE)unitswereattachedtothefourmeso-positionsofTPPcoreviaestergroupthroughafacileandefficientroute.Thederivedcompound(4(TPE-COO)-TPP)emitsredfluorescence(peakat655nm)withagoodquantumefficiency(F)of7.5%,whichismuchhigherthanthatofTPP(Φ~0.1%).Inmolecularaggregateformedintetrahydrofuran(THF)andwatermixtures,4(TPE-COO)-TPPhasarelativehighFof12%.TheevidentlysubduedACQbehaviorcanbeascribedtothepropellershapeandbulkysizeoftheTPEunits,whichpreventtheclosepackingandstrongp-pinteractionofTPPcores.TheloosemolecularpackingandweakinterchromophoreinteractionswerevalidatedbydifferentcharacterizationmethodsincludingUV-visibleabsorption,steadystateandtransientfluorescencespectroscope,X-raydiffractionandscanningelectronicmicroscopeobservations.Itisnotedthat4(TPE-COO)-TPPhasanemissionefficiencyof14.4%indiluteTHFsolution.ThisisduetotheconjugationbreakbetweentheTPPandTPEmoieties,therotationalandvibrationalmotionsofthephenylgroupscannotquenchthefluorescenceof4(TPE-COO)-TPP.
出版日期
2019年01月11日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
