04 INTRODUCTION TO TRANSITION METALS CHEMISTRY AND COORDINATION COMPOUNDS (PART 3).pdf

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Introduction to Transition MetalsChemistry and CoordinationCompounds
Constitutional Isomers of CoordinationCompoundsCompounds with the same formula, but with the atomsconnected differently, areconstitutional isomers.Coordination isomersoccur when the composition ofthe complex ion, but not the compound, is different.- This can occur by the exchange of a ligand and a counter ion, or bythe exchange of ligands.Linkage isomersoccur when the composition of thecomplex ion is the same but the ligand donor atom isdifferent.- Some ligands can bind to the metal througheither of two donoratoms.
Linkage IsomersThe nitrite ion can bind either through the N atom or either one ofthe O atoms.
Ligands that have more than one donor atom
Stereoisomers of CoordinationCompoundsStereoisomers are compounds that have the same atomicconnections but different spatial arrangements of theiratoms.Geometricorcis-transisomers occur when atoms orgroups can either be arranged on thesameside or onoppositesides of the compound relative to the centralmetal ion.Opticalisomers (enantiomers) are nonsuperimposablemirror images of each other.
Geometric IsomerismIn thecisisomer, identical ligands are adjacent to each other, while inthetransisomer they are across from each other.Thecisisomer (cisplatin) is an antitumor agent while thetransisomer has no antitumor effect.Thecisandtransisomers of [Pt(NH3)2Cl2].
Geometric IsomerismThecisandtransisomers of [Co(NH3)4Cl2]+.Note the placement of the Clligands (green spheres).cistrans
Optical Isomerism in an Octahedral Complex Ionchiralachiral
Optical IsomerismChiral molecules are optically active.Rotate the plane of polarized light.Polarimeter
Important Types of Isomerism inCoordination Compounds
Draw stereoisomers for each of the following andstate the type of isomerism each exhibits:(a)[Pt(NH3)2Br2] (square planar)(b)[Cr(en)3]3+
SOLUTION:
(b)Ethylenediamine (en) is a bidentate ligand. The Cr3+ion hasa coordination number of 6 and an octahedral geometry, likeCo3+. The three bidentate ligands are identical, so there is

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Term
Fall
Professor
Dubois,J
Tags
octahedral complex ion

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