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含电子给体的蒽基齐聚物及共聚物的合成及大双光子吸收截面.docx

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含电子给体的蒽基齐聚物及共聚物的合成及大双光子吸收截面 Abstract Anthracene-basedoligomersandcopolymerscontainingelectron-donatinggroupsweresynthesizedandcharacterized.Thematerialsweredevelopedfortheirlargetwo-photonabsorptioncross-sections,animportantpropertyforapplicationsinopticallimitingandnonlinearoptics.Thesynthesiswasachievedviaapalladium-catalyzedSuzuki-MiyauracouplingreactionandthematerialswerecharacterizedbyNMR,UV-vis,andfluorescencespectroscopy.Theresultsshowedthattheincorporationofelectron-donatinggroupsintotheanthracene-basedoligomersandcopolymersincreasedtheirtwo-photonabsorptioncross-sections,makingthempromisingmaterialsforvariousnonlinearopticalapplications. Introduction Nonlinearoptical(NLO)materialspossessavarietyofphysicalproperties,suchasbistability,opticalswitching,wavelengthconversion,andopticallimiting,whichmakethemusefulfornumerousapplicationsintelecommunications,opticalcomputing,andinformationprocessingtechnology.AmongthevariousNLOmaterials,two-photonabsorbing(2PA)moleculeshavegainedconsiderableattentionduetotheiruniqueproperties,includinghighspatialresolution,lowphotodamage,anddeeppenetrationinbiologicalcells,makingthemanidealcandidateforthree-dimensionalimaging,andphotodynamictherapy. Overtheyears,researchershavedevelopedvarious2PAmaterialscomprisingmetalcomplexes,porphyrins,andconjugatedaromaticcompoundssuchasdyes,conjugatedoligomers,andpolymers.Amongthem,anthracene-basedoligomersandcopolymershavereceivedincreasedattentionduetotheirunexcelledthermalandoxidativestability,highfluorescencequantumyield,andstrong2PAproperties.Theincorporationofelectron-donatinggroupsintotheanthracene-basedoligomersandcopolymersisawell-establishedmethodtoenhancetheir2PAproperties,makingthempromisingcandidatesforthedevelopmentofNLOmaterials. SynthesisofAnthracene-basedOligomersandCopolymers Thesynthesisofanthracene-basedoligomersandcopolymerswasachievedutilizingapalladium-catalyzedSuzuki-Miyauracouplingreaction.Brominatedanthracenederivativeswerecoupledwithrespectivelysubstitutedboronicaci