Chapter_23_Lecture 3

Chapter_23_Lecture 3 - Formulas and Names of Coordination...

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Formulas and Names of Coordination Compounds Important rules for writing formulas of coordination compounds The cation is written before the anion he charge of the ation ) is balanced by the charge of the anions The charge of the cation(s) is balanced by the charge of the anions In the complex ion, neutral ligands are written before anionic ligands The entire complex ion is placed in brackets, i.e., [ ] Example # 1 K 2 [Co(NH 3 ) 2 Cl 4 ] Counter Ion: two cations (K + ) – Total Charge +2 Complex Ion: Net Charge on Complex Ion -2 [Co(NH 3 ) 2 Cl 4 ] -2 Complex Ion: Neutral Ligands (2 NH 3 ) – Total Charge 0 omplex Ion: Charged Ligands (4 l - otal Charge - Complex Ion: Charged Ligands (4 Cl ) Total Charge 4 Central Metal Cation (Co 2+ ) – Total Charge +2 + o 2+ H l - 23-43 K 2 [Co (NH 3 ) 2 Cl 4 ]
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Coordination Compounds Formulas Example # 2 – Complex Ion and Counter Ion [Co(NH 3 ) 4 Cl 2 ]Cl Counter Ion (Cl - ) (not part of complex ion) – Total charge -1 Complex Ion - Neutral Ligands (4 NH 3 ) – Total Charge 0 Complex Ion - Anion Ligands (2 Cl - ) – Total Charge -2 Complex Ion - [Co(NH 3 ) 4 Cl 2 ] + – Total Charge +1 Complex Ion - Central Metal Atom (Co) – Total Charge +3 [Co 3+ (NH 3 ) 4 Cl - 2 ] + Cl - 23-44
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Coordination Compounds Formulas Example #3 – Complex Cation and Complex Anion [Co(NH 3 ) 5 Br] 2 [Fe(CN) 6 ] Complex Cation - [Co(NH 3 ) 5 Br] 2+ Complex Cation Central Atom (Co +3 ) – Total charge +3 Complex Cation Neutral Ligands (5 NH 3 ) – Total Charge 0 Complex Cation Anionic Ligand (Br - ) – Total Charge -1 Complex Anion ([Fe(CN) 6 ] 4- ) – Total Charge -4 Complex Anion Central Cation (Fe 2+ ) – Total Charge +2 Complex Anion Ligand (6 CN -1 ) – Total Charge -6 [Co 3+ (NH 3 ) 5 Br - ] 2 [Fe 2+ (CN - ) 6 ] 23-45 2 x (3 -1) = 4 2 - 6 = -4
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Naming Coordination Compounds Rules The Cation is named before the Anion ithin the Complex Ion the Ligands are named in Within the Complex Ion, the Ligands are named, in alphabetical order , before the metal ion Neutral Ligands generally have the molecule name, with xceptions Ex NH mmine) H (aqua) CO (carbonyl) exceptions Ex. NH 3 (ammine), H 2 O (aqua), CO (carbonyl) Anionic Ligands drop the –ide and add –o after the root name Ex. Cl - becomes “chloro” A numerical prefix indicates the number of ligands of a particular type Ex. di (2), tri (3), tetra (4) o(NH l l [Co(NH 3 ) 4 Cl 2 ]Cl Tetra ammine di chloro cobalt(III)chloride 23-46
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Naming Coordination Compounds Rules Some ligand names already contain a numerical prefix Ethylenedi amine In these cases the number of ligands is indicated by such rms as: is ) is ) trakis ) terms as: bis (2), tris(3), tetrakis(4) A compound with two ethylene ligands the following it its name is thylenediamine bis(ethylenediamine) Di Bis II ri ris I umerical Prefixes used Tri Tris III Tetra Tetrakis IV Penta pentakis V exa exakis I Numerical Prefixes used In Complex Anions 23-47 Hexa Hexakis VI Septa Septakis VII
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Naming Coordination Compounds Rules (continued)
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This note was uploaded on 07/31/2010 for the course CHEM CHEM 01C taught by Professor Unknown during the Spring '10 term at UC Riverside.

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Chapter_23_Lecture 3 - Formulas and Names of Coordination...

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