8.2-3A Structure of Coordination Compound.pdf - 2020/5/8...

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2020/5/81Chapter8:TransitionMetals8.2IntroductiontoCoordinationChemistry8.2.1FormationofCoordinationComplexes(AlfredWerner)8.2.2NamingCoordinationCompounds8.2.3Ligand SubstitutionReactions8.3StructuresofCoordinationComplexes8.3.1OctahedralGeometries8.3.2Square‐Planar,Tetrahedral,andLinearGeometriesCoordinationComplexesinHeme ProteinsContentsCoordinationCompoundConsistsofacomplexionandcounter‐ionsComplexion:TransitionmetalionwithitsattachedligandsCounter‐ions:AnionsorcationsthatarerequiredtoproduceacompoundwithnonetchargeExample:[Co(NH3)5Cl]Cl2[Chloro‐pent‐ammine‐cobaltchloride]Bracketsindicatethecomplexioncomposition2CoordinationCompoundThedifferencebetweenmaingroupmetalsandthetransitionmetals,e.g.Na+(aq)andFe3+(aq)Example:Fe(NO3)3inHNO3solutionFe3+(aq)isboundedtoH2Ostrongly.Watermoleculesareboundedtothemetalsostronglythatevenwedryit,therearestillwatermoleculesboundedtothemetal.Somekindofdefinitenumberandanorderedsystem–verywellcoordinated!3CoordinationCompoundConsistsofacomplexExample:[Co(NH3)5Cl]Cl2[Chloro‐pent‐ammine‐cobaltchloride]Bracketsindicatethecomplexioncomposition41234
2020/5/82AlfredWernerSwisschemistNobelPrizeinChemistryin1913forproposingtheoctahedralconfigurationoftransitionmetalcomplexes.ProposedthattransitionmetalionshavetwotypesofvalencePrimaryvalence‐ AbilitytoformionicbondswithoppositelychargedionsCurrentlytermedastheoxidationstateSecondaryvalence‐ Abilitytobindtoligands(Lewisbases)andformcomplexionsCurrentlytermedasthecoordinationnumberAnExampleofanOctahedralConfiguration[Co(NH3)6]Cl3HexaamminecobaltchlorideFigure8.8:Ball‐and‐stickmodeloftheoctahedralcomplex[Co(NH3)6]3+.

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Term
Fall
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DINNER
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Polydentate Ligands

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