112 Exam III Lec Notes.pdf - CHEMISTRY 112 LECTURE EXAM III...

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Page 1CHEMISTRY 112 LECTUREEXAM IIITransition Metals and Coordination CompoundsChapter 24 pages 1046-1049,1052-1071Background:The colors associated with compounds provide insights into their structureand bonding.Transition metals display some of the most vibrant colors,this is due to their bondingTransition metals are capable of forminghighly colorized ”complex ions”, [Fe(H2O)6]3+, for example.Thesecompounds are calledCoordination compounds.PART ICOORDINATION COMPOUNDSA.Tools- Coordinate Covalent BondsB.Ligands(Chelating Agents/Complexing Agents)1. Lewis bases/ e-donor2. uni, bi, tri, and polydentates3. charged and neutral4.Examples:NH3, CO, CN-, H2O, Cl, NO2-, EDTA, C2O42-*Note:you need to remember thaten(ethylenediamine) and C2O42-arebidentates. And EDTA is a tetradentate (polydentate)a.Unidentatesb.Bidentatesc.Polydentates
Page 2B.Ligands, continued(Chelating Agents/Complexing Agents)5.Oxidation state of the metal[Cu(NH3)4]2+[Co(NH3)5Cl](NO3)2[Cr(H2O)4Cl2]Cr(III)[Fe(en)2Cl]Fe(III)6.Coordination NumberThe number of atoms attached to the metal is coordination number ofthe metal.LigandCoordination #I:Hg:I-Ï[Ni(CO)4]2+[Co(CN)4]3-[Co(NH3)6]3+HHH —C— C—H(Bidentate!)N:Ni:N
Page 3C.Nomenclature1 In naming salts, the cation is written before the anion2 Within a complex ion, the ligands are named before the metal ion3 Ligands are listed in alphabetical order4 Prefixes that give the number of ligands are not consideredin determining the alphabetical order5 The names of anionic ligands end in the letter “o”6 Neutral ligands generally have the molecule nameExceptions are water and ammonia7 A Greek prefix (di,tri,tetra, penta, and hexa) is used to indicate thenumber of each ligand.8 If the complex is an anion, its name ends in -ate9 The oxidation number of the metal is given in parentheses10 Some metals which are part of the anion complex will use the latinname with -ate as an ending11When the name of the ligand has a prefix, use:bis(2), tris (3),tetrakis (4) to give the number of ligands in the compoundCation NameLatin NameAnion NameCopper CuprumCuprateGoldAurumAurateIronFerrumFerrateLeadPlumbumPlumbateSilverArgentumArgentateTinStannumStannateAnion NameLigand NameBromide, Br-Bromo*You need to remember that *Oxalate, C2O42-Carbonate, CO32-Carbonatoand *Ethylenediammine,en are bidentates withChloride, Cl-Chloro2 binding sites to the metal ion.Cyanide, CN-CyanoFluoride, F-FluoroHydroxide, OH-Hydroxo*Oxalate, C2O42-OxalatoA bidentate!Oxide, O2-OxoSulfate, SO42-SulfatoMoleculeLigand NameAmmonia, NH3AmmineCarbon monoxide,COCarbonylWaterAqua*Ethylenediammine,enEthylenediammineA bidentate!EXAMPLES:[Co(NH3)5Cl]Cl2Pentaamminechlorocobalt(III)ChlorideK4[Fe(CN)6]PotassiumHexacyanoferrate(II)
Page 4EXCERCISES[Co(NH3)4(H2O)CN]Cl2Na2[MoOCl4]Na[Al(OH)4][Cr(H2O)4Cl2]ClK4[Ni(CN)4][Co(en)2F2]Potassium amminepentachloroplatinate(IV)Sodium hexabromoferrate(II)Tetraamminedichlorocobalt(III)chloride
Page 5PracticeA.

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