lecture14_March_8 - 2.4 Isomers Isomers have the same...

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2.4.1 Structural isomers - Coordination isomers 2.4 Isomers Isomers have the same chemical composition (or formula) but differ in either bonding (i.e., structural isomers) or spatial arrangement (i.e., stereoisomers). 31 - two isomers can have very different properties e.g., colour, interaction with light, reactivity… - ligand(s) and counter ion(s) exchange position(s) Example: [Pt(NH 3 ) 4 Cl 2 ](NO 2 ) 2 & [Pt(NH 3 ) 4 ( NO 2 ) 2 ]Cl 2
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Consider [Co(NH 3 ) 5 (NO 2 )] 2+ 2.4.2 Structural isomers - Linkage isomers bound via N 32 - ligand rearranges and binds via another atom bound via O orange red
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33 Attachment through N (nitro): pentaammine nitro cobalt(III) ion Attachment through O (nitrito): pentaammine nitrito cobalt(III) ion
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34 What other ligands can do this? SCN - Know these 3 ligands that form linkage isomers! binds via sulfur binds via nitrogen called thiocyanato- called isothiocyanato- OCN - binds via oxygen binds via nitrogen called cyanato- called isocyanato- In general, need lone pairs on different atoms.
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2.4.3 Stereoisomers: Geometric isomers 35 - relative spatial arrangement of ligand changes - also called cis - trans isomers e.g., [Pt(NH
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This note was uploaded on 04/27/2011 for the course ENGG 130 taught by Professor Lubell during the Spring '08 term at University of Alberta.

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lecture14_March_8 - 2.4 Isomers Isomers have the same...

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