Lecture 21

Lecture 21 - 3/3/10 What is the formula of the compound !

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3/3/10 1 29 What is the formula of the compound Hexamminecobalt(III) tetrachloroferrate(III)? A) [FeCl 4 ] 3 [Co(NH 3 ) 6 ] B) [Co(NH 3 ) 6 ][FeCl 4 ] C) [Co(NH 3 ) 6 ][FeCl 4 ] 3 D) [Co(NH 3 )] 2 [FeCl] 3 E) [Fe(NH 3 ) 6 ][CoCl 4 ] 3 A coordination compound made up of 2 complex ions Cation: Ammine = NH 3 Co(III) = Co 3+ Name: Cation before anion Hexa = 6 [Co(NH 3 ) 6 ] 3+ Anion: chloro = Cl - Fe(III) = Fe 3+ Tetra = 4 [FeCl 4 ] - [FeCl 4 ] 3 3- 2.4.1. Coordination isomers: 2.4. Isomers Isomers have the same chemical composition but are different due to differences in bonding (structural isomers) or orientation (stereoisomers) 30 - can strongly affect compound properties e.g., colour, interaction with light, reactivity… - a ligand and counter-ion exchange position (or ligands and counter-ions) [Pt(NH 3 ) 4 Cl 2 ](NO 2 ) 2 ! [Pt(NH 3 ) 4 ( NO 2 ) 2 ]Cl 2 Consider [Co(NO 2 )(NH 3 ) 5 ] 2+ 2.4.2. Linkage isomers Bound via N Composition of complex unchanged 31 Ligand rearranges and binds through another atom
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Lecture 21 - 3/3/10 What is the formula of the compound !

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