Lecture23 - Chem 162, Lect 23, Spring 2011 Isomerism...

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Chem 162, Lect 23, Spring 2011 Isomerism Isomers: Two or more species having the same molecular formula, but different molecular structures. Isomers have different physical and/or chemical properties because the arrangements of the atoms differ. "Old" Examples: C 4 H 10 butane CH 3 CH 2 CH 2 CH 3 and iso-butane CH 3 CH(CH 3 ) 2 are structural isomers (same atoms, different bonds); C 2 H 6 O: ethanol (CH 3 CH 2 OH) and acetone (CH 3 OCH 3 ) are also structural isomers Different types of isomerism: Structural Isomers (same atoms, different bonds) and Stereoisomers (same atoms and same bonds, but different spatial arrangements of the atoms) Structural Isomers: coordination isomers and linkage isomers 1
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Stereoisomers: geometrical isomers and optical isomers Structural Isomerism (same atoms but different bonds) – sometimes referred to as “Constitutional Isomerism” Two kinds : Coordination and Linkage Isomerism Coordination isomerism : Switch of ligand and counter ion. [CrSO 4 (NH 3 ) 5 ]Br and [CrBr(NH 3 ) 5 ]SO 4 Pentaamminesulfatochromium(III) bromide and Pentaamminebromochromium(III) sulfate [FeCl(NH 3 ) 5 ]Br and [FeBr(NH 3 ) 5 ]Cl Pentaamminechloroiron(II) bromide and Pentaamminebromoiron(II) chloride
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Lecture23 - Chem 162, Lect 23, Spring 2011 Isomerism...

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