Nomenclature of Coordination Compounds and Complex Ions PDF

Nomenclature of Coordination Compounds and Complex ions  Coordination Complexes ▶ Consist of a ligand (anion or a neutral molecule that donates an electron pair to the complex) and a metal center cation ▶ Complex cation: [CO(NH 3 )6 ]+3 ▶ C...

Nomenclature of Coordination Compounds and Complex ions  Coordination Complexes ▶ Consist of a ligand (anion or a neutral molecule that donates an electron pair to the complex) and a metal center cation ▶ Complex cation: [CO(NH 3 )6 ]+3 ▶ Complex anion: [CoCl4(NH3)2]- ▶ Neutral complex: [CoCl3(NH3)3] ▶ Coordination compound: K4[Fe(CN)6] 6  1. Ligands are named first in alphabetical order based on formula. Anion ligands come first before the neutral ones. ▶Ligands that act as anions which end in “ide” are replaced with an ending “o” ▶ Anionsending with “ite” and “ate” are replaced with endings “ito” and “ato” respectively ▶ Most neutral ligand carry their normal name 7  Names of Common Ligands Anion Monodentate Ligands Neutral Ligands Molecular form Ligand name Molecular form Ligand name Fluoro NH3 Ammine OH- Hydroxo H2O Aqua Cl- Chloro CO Carbonyl SO4-2 Sulfato NO Nitrosyl Br- Bromo CH3NH2 Methylamine S2O3-2 Thiosulfato C5H5N Pyridine I- Iodo Polydentate Ligands NO2- Nitrito; Nitro Short name Extended name O-2 Oxo en Ethylenediamine CN- Cyano ox-2 oxalato SCN- Thiocyanato EDTA-4 ethylenediaminetetraacetato NC- Isocyano NCS- Isothiocyanato 8  Nomenclature of Inorganic Complexes 2. Number of ligands present in the complex is indicated w / prefixes except polydentates that have a prefix already in their name ▶ 1 – mono(optional) 2 – di 3 – tri 4 – tetra 5– penta ▶ 6 – hexa 7 – hepta 8 – octa 9 – nona 10 – deca ▶ Put the ligands name in parentheses and use bis, tris, and tetrakis (polydentates) ▶ Prefixes always go before the ligand name and are not taken into account when putting ligands in alphabetical order ▶ Ex. [FeCl(CO)2 (NH 3 ) 3 ]+2 chlorodicarbonyltriammineiron (III) ion [CoCl2 (en) 2 ]+ dichlorobis(ethylenediamine)cobalt (III) ion 9  3. When naming the metal center, you must know the formal metal name and the oxidation state  Use Roman numeral to indicate the oxidation state of the metal  If the overall coordination complex is an anion, the ending “ate” is attached to the metal centers [Cr(OH)4]- tetrahydroxochromate (III) ion [CuCl4]-2 tetrachlorocuprate (II) ion [Pt(NH3)4] [Pt(Cl)4 tetraammineplatinum(II) tetrachloropaltinate (II) 1  Name the following: 1. [Cr(H2O)6]Cl3 2. [Al(OH)(H 2 O)5]+2 3. K3[Fe(CN)6] 5. [CoCl(H 2O)2(NH3)3]Cl2 6. K4[Ni(CN)6] 7. Na[PtCl3(NH3)] 1  Name the following: 8.Na3[Co(NO2)6] 9. [Mo(EDTA)] (ClO4 )₂ 10. HgS22- 11. Al(OH)4- 12. Au(OH)4- 13. Ag(NH3)2+ 14.[ Co(NH3)5] 2+ 15. [CoCl(NO2)(NH3)4]+ 1