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1、ORGANICLETTERSEfficientSynthesisandPropertiesof2007Vol.9,No.11IsomericPhotochromicDiarylethenes2139-2142HavingaPyrroleUnitShouzhiPu,*GangLiu,LiangShen,andJingkunXuJiangxiKeyLaboratoryofOrganicChemistry,JiangxiScience&TechnologyNormalUniVersity,Nanchang330013,Peop
2、le'sRepublicofChinapushouzhi@tsinghua.org.cnReceivedMarch14,2007ABSTRACTTwonewisomericphotochromicdiaryletheneswithapyrroleunithavebeendeveloped.Theirproperties,includingphotochromicbehavior,crystalstructures,andfluorescentproperties,havebeeninvestigated.Thetwois
3、omericcompoundsshowdistinctlydifferentphotochromism,bothinsolutionandinthesingle-crystallinephase:oneturnsreduponphotocyclizationwhereastheotherturnsblue,whichmaybeattributedtothedifferentsubstituenteffects.Photochromicdiarylethenederivativeshaveattractedmuchbenz
4、ofuran,6indene,7pyrazole,8etc.Themajorityoftheattentionashighlypromisingcandidatesforoptoelectronicresearchworkreportedtodatehasbeendevotedtothedevicessuchasopticalmemoriesandphotoswitches,mainlydevelopmentofthesemoleculesandinvestigativestudiesofduetotheexcellen
5、tthermalstabilityoftherespectivetheirfundamentalproperties,andtheresultsobtainedhaveisomers,notablefatigueresistance,andhighreactivityinthecontributedtoabroadunderstandingofthephotochromismsolidstate.1Recently,thedesignandsynthesisofnovelofdiarylethenes.9Atthesam
6、etime,theresultshavealsodiarylethenesystemswithdifferentarylmoietieshasbecomedemonstratedthatthephotochromicperformanceofeachtypeanactiveareaofresearch.Amongthediaryletheneshithertoofdiaryletheneisstronglydependentonthenatureofthereported,mostoftheheteroarylmoiet
7、ieshavebeenthiophenearylgroups.Forinstance,diaryletheneswiththiopheneororbenzothiophenerings,2withjustafewreportsconcerningbenzothiophenemoietiesexhibitexcellentthermalstabilityotherheteroarylmoieties,suchasfuran,3thiazole,4indole,5andoutstandingfatigueresistance
8、,1whereasdiarylethenes(1)(a)Irie,M.Chem.ReV.2000,100,1685.(b)Tian,H.;Yang,S.J.Chem.Soc.ReV.2004,33,85.(c)Kawata,S.;Kawata,Y.Chem.ReV.2000,(3)Deng,X.D.;Liebeski
