synthesis, structure and fluorescence of a novel diarylethene

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1、TetrahedronLettersTetrahedronLetters46(2005)871–875Synthesis,structureandfluorescenceofanoveldiaryletheneShouzhiPu,*JingkunXu,LiangShen,QiangXiao,TiansheYangandGangLiuJiangxiKeyLabofOrganicChemistry,JiangxiScience&TechnologyNormalUniversityNanchang,330013PRChinaRece

2、ived3September2004;revised16November2004;accepted18November2004Availableonline16December2004Abstract—Thephotochromicdiarylethene,1,2-bis(2-methyl-5-(2-(1,3-dithiolpentane))-thien-3-yl)perfluorocyclopentene(BMDTP),hasbeensynthesizedinhighyieldanditsstructurewasdeterm

3、inedbyX-raycrystallographicanalysis.Thecompoundundergoesaphotochromicreactionbothinsolutionandinthesinglecrystallinephase.Inaddition,itsfluorescencepropertyinsolutionisdiscussed.Ó2004ElsevierLtd.Allrightsreserved.Generally,photochromismisdefinedasalight-inducedversio

4、nreactionsproceedinaconrotatorymode.Inareversibletransformationbetweentwoisomershavingapreviouspaper,wereportedtheallomorphismofadistinguishableabsorptionspectralchange.1Photochro-diarylethenecompoundanddiscusseditsphotochromicmiccompoundsareclassifiedintotwocategor

5、ies,(1)propertiesbothinsolutionandthesinglecrystallinethermallyreversiblecompoundswhosephotogeneratedphase.15Itisagoodexampleofvalidatingtherulecoloredisomersarethermallyunstableandreturntoexactly.theinitialcolorlessisomersinthedarkand(2)thermallyirreversiblecompou

6、ndswhosephotogeneratedcoloredForpracticalapplicationsitisrequiredtofurtherim-isomersareverystableandneverreturntotheinitialprovetheperformanceofthephotochromicdiaryleth-colorlessisomersinthedark.2Recently,severalther-enesbyimprovingtheirpropertiessuchasthermalmally

7、irreversiblephotochromiccompounds,suchasstability,sensitivity,responserate,andreactivityinthefurylfulgides,3diarylethenes,4andphenoxynaphtha-solidstate.Inaddition,diarylethenes,whichabsorbatcene-quinones,5havebeendeveloped.Amongtheseashortwavelengthwithhighsensitiv

8、ity,shouldbecompounds,diaryletheneswithheterocyclicarylringsdevelopedinordertoimprovetheopticalstorageden-arethemostpromisingfortheoptoelectronic