资源描述：
《syntheses and properties of new photochromic diarylethene derivatives having a pyrazole unit》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、TetrahedronLetters47(2006)6473–6477SynthesesandpropertiesofnewphotochromicdiarylethenederivativeshavingapyrazoleunitShouzhiPu,*TiansheYang,JingkunXuandBingChenJiangxiKeyLabofOrganicChemistry,JiangxiScienceandTechnologyNormalUniversity,Nanchang330013,PRChinaReceived30March
2、2006;revised3June2006;accepted6June2006Abstract—Newphotochromicdiarylethenes1a,2aand3abearingapyrazoleunithavebeensynthesized.Theirproperties,includingphotochromicreactivity,fluorescenceandelectrochemicalpropertieswereinvestigated.Thesecompoundsshowedgoodphotochro-micprope
3、rties,highcycloreversionquantumyieldandrelativelystrongfluorescence.Thecycloreversionquantumyieldsof1a,2aand3aare0.46,0.53and0.57,respectively,whicharelargerthanthoseoftheircyclizationquantumyields(0.43,0.45and0.47,respectively).Theoxidationsofdiarylethenes1a,2aand3awerein
4、itiatedat0.73,1.11and0.79V,respectively.Moreover,theposi-tionofthemethoxylsubstituenthadremarkableimpactsontheaboveopticalandelectrochemicalproperties.Ó2006PublishedbyElsevierLtd.Thedesignandsynthesisofphotochromiccompoundsarethermallyunstableandreturntotheopen-ringiso-is
5、anareaofintenseresearchbecauseoftheirwide-merseveninthedark.24Whenthearylgroupshavespreadpotentialapplicationinphotonicdevicessuchlowaromaticstabilizationenergy,thederivativesunder-ashigh-densityopticalrecordingmaterialsandphoto-gothermallyirreversiblephotochromicreaction
6、s.27Pyr-switches.1–6Amongvarioustypesofphotochromicazoleisanattractivearylunitbecauseofitslowcompounds,photochromicdiarylethenederivativeswitharomaticstabilizationenergyandthestructureissimilarheterocyclicarylringsarethemostpromisingorganictoisothiazole,expectingtoundergo
7、thermallyirrevers-photochromiccompoundsforphotoelectronicapplica-iblephotochromicreactions.Untilnow,photochromictionsbecauseoftheexcellentthermalstabilityofbothhybriddiarylethenederivativeswithpyrazoleandthio-ofthetwoisomers,fatigueresistantcharacter,rapidphenemoietieshav
8、enotyetbeenreported.responseandhighreactivityinsolidstate.7–10Inthepresentwork,wehavesynthesized
