应用化学专业英语 教学课件 作者 黄忠 谢普会 付颖 主编lesson 5 coordination chemistry.ppt

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1、Lesson5CoordinationChemistryIntroductionCoordinationchemistryNomenclatureofcoordinationcompoundsIsomerismofcoordinationcompoundsCoordinationchemistryComplexCentralmetalionbondedviacoordinatecovalentbondstooneormoremoleculesorionsarecalledligands.Complexion

2、=complexwithnetcharge.Coordinationnumber=numberofcovalentbondsformedbetweenmetalionandtheligandsorligand.CoordinationchemistryCoordinationcompoundNeutralsubstancemadeupofcomplexionandanotherionofoppositecharge.(b)Neutralcomplex.LigandLewisbase–containsaton

3、enonbondingpairofelectrons.TypesofcomplexesCationiccomplexesThecomplexionhasapositivecharge.Example:[Co(NH3)6]3+AnioniccomplexesThecomplexcarriesanegativecharge.Example:[Ag(CN)2]-NeutralcomplexThecomplexdoesnotcarryacharge.Example:[Ni(CO)4]Doublesaltsandco

4、ordinationcompoundsThosewhichlosetheiridentityinsolutioniscalleddoublesaltsFeSO4(NH4)2SO4.6H2OFe2++2NH4++2SO42-+6H2OThosewhichretaintheiridentityinsolutioniscalledcomplexesK4[Fe(CN)6]4K++[Fe(CN)6]4-WhoisFatherofCoordinationchemistry?Werner’stheory-1893We

5、rner’sTheoryWernerexplainedthenatureofbondingincomplexesbasedonthetwotypesofvalencyPrimaryvalencyThenumberofchargeonthecomplexion.SecondaryvalencyThenumberofligandatomscoordinatedtothemetal.Thisisnowcalledthecoordinationnumber.Coordinationchemistrycomplexf

6、ormationreactionsMn++pLx-M(L)pn-x(L=anion)Mn++pLM(L)pn+(L=molecule)WhereMn+=Leiwsacid(centerofcoordination)LandLx-=Leiwsbases(ligands)CommonLigandsMonodentateligandsContainsonlyonedonaratomExamples:H2O,NH3,CN-,SCN-,X-(halideions),CO,O2-BidentateligandsCont

7、ainstwodonaratomsExamples:Oxalateion(ox)C2O42-,etylenediamine(en)H2NCH2CH2NH2PolydentateligandsContainsmorethantwodonaratomsExample:ethylenediaminetetraacetateion(EDTA4-)Bidentateligandethylenediamine(en)oxalate(ox)diethylenetriamine(dien)TridentateligandT

8、etradentateligandtriethylenetetraamine(trien)Polydentateligand(EDTA)Coordinationnumber:6Nomenclatureofcoordinationcompounds:IUPACrulesCationnamedbeforeanionforioniccompounds;Whennamingcomplexes:Ligandsarenam