Mechanism of Ethylene Migratory Insertion and Dimerization Catalyzed by σ-Alkyl Platinum Complexes--A DFT Study.pdfVIP
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Mechanism of Ethylene Migratory Insertion and Dimerization Catalyzed by σ-Alkyl Platinum Complexes--A DFT Study.pdf
FULLPAPE
Mechanism ofEthyleneMigratoryInsertionandDimerization
Catalyzedbyo-AIkylPlatinum ComplexesmA DFTStudy
Sheng,Yu(盛玉) Geng,Zhiyuan(耿志远) Wang,Yongcheng(T永成)
Wang,Yuzhi(王玉芝) Sun,Xia0jian(孙小建)
GansuKeyLaboratoryofPolymerMaterials,CollegeofChemistryandChemicalEngineering,KeyLaboratoryof
Eco—environment—relatedPolymerMaterials,MinistryofEducation,NorthwestNormal
University,La nzhou,Gansu730070,China
Themechanism ofethyleneinsertionreactionscatalyzedbycationica-alkylplatinum complexeshasbeenstud—
iedattheB3LYPlevelofdensityfunctionalhteory.Theinitialstepsofthereactionsproceedviathecoordinationof
ethylenetohtereactantsL2Pt(II)R ,whereL2=none,(NH3)2,(CHNH)2;R=H,CH3,C2H5inwhichethylenecoot—
dinatesstronglytothecomplexesPtCH: andPtC,H (coordinationenergies(cE)are296.52and229.28
kJm/ol,respectively),whilenitrogen—containing ligandsdecreasethe energies:Pt(NH3)2CH+3 (CE:180.04
kJ/mo1),PtN(H3)2C2H (CE:97.86kJot/o1),Pt(CHNH)2CH:(cE:176.31kJ/mo1)andPt(CHNH)2C2H (CE:
91.00kJ/mo1).Moreover,ethyleneinsertionintothePt—alky1bond.whichishterate—determiningstep.isendother—
micwithbarrierheightsforL2PtCH3(C2H~1) decreasinginhteorder:PtCH+ (164.18kJ/mo1)(NH3)2PtCH+
(129.95kJm/o1)(CHNH),PtCH*~ (11527kJ/mo1),whichhasthesametendencyfortheethylcase.Theinsertion
productwillcontinuallyundergo8一hydrideelimination,whichisexothermic.Ontheotherhand theeffectsofsol—
vent(dichloromethane,THFandbenzene)raeinvestigatedwithPCM method,buthteinclusionofhteeffectsinhte
computationsonlyslightlyaffectstheresults.Besidethat.acompletecatalyticcycleofrethylenedimerizationis
studiedindetailandhtecalculationsagreewellwithknownenergeticandrecognizedtendencies.
Keywords platinum,ehtylene,in
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