CHEM 1220 Chapter Notes - Chapter 24: Coordinate Covalent Bond, Coordination Complex, Cyan
Document Summary
Get access
Related textbook solutions
Chemistry: Structure and Properties
Basic Chemistry
Principles of Chemistry Molecular Approach
Principles of Chemistry Molecular Approach
Chemistry: Structure and Properties
Chemistry: A Molecular Approach
Chemistry: A Molecular Approach
Principles of Chemistry: A Molecular Approach
Chemistry: The Central Science
Related Documents
Related Questions
A complex ion is a species in which a central metal ion is attached to a group of surrounding ions or molecules by coordinate covalent bonds. The surrounding species are called ligands. Within a ligand, the atoms that are directly attached to the metal ion (or atom) are called donor atoms. Most ligands contain a single donor atom (monodentate), but some contain two donor atoms (bidentate), six donor atoms (hexadentate), or another combination of donor atoms. A complex ion that is associated with one or more counter ions is called a coordination compound. For example [PdCl4]2â is a complex ion, and Na[PdCl4] is a coordination compound. The following table lists some common ligands.
Ligand | Number of donor atoms |
Clâ | 1 |
Fâ | 1 |
Brâ | 1 |
CO32â | 2 |
CNâ | 1 |
glyâ | 2 |
EDTA4â | 6 |
NH3 | 1 |
H2O | 1 |
CO | 1 |
The coordination number for a complex is the total number of donor atoms surrounding the central atom. The overall charge on a complex is the sum of the charges of the metal and all the ligands.
Part A
What is the coordination number for each of the following complexes or compounds?
a) [Co(NH3)4Cl2]+
b) [Pb(EDTA)]2â
c) [Pt(NH3)4]2+
d) [Ag(NH3)2]NO3
Part B
What is the charge on each of the following complex ions?
a) hexaaquachromium(II), [Cr(H2O)6]?
b) tris(carbonato)aluminate(III), [Al(CO3)3]?
c) amminepentachloroplatinate(IV), [Pt(NH3)Cl5]?
Part C
What is the oxidation number of the central metal ion in each of the following complexes or compounds?
a) [NiCl2Br2]2â
b) [Cr(H2O)2(NH3)4]3+
c) Na[Ag(CN)2]
Constants | Periodic Table A complex ion is a species in which a central metal ion is attached to a group of surrounding ions or molecules by coordinate covalent bonds. The surrounding species are called ligands. Within a ligand, the atoms that are directly attached to the metal ion (or atom) are called donor atoms. Most ligands contain a single donor atom (monodentate), but some contain two donor atoms (bidentate), six donor atoms (hexadentate), or another combination of donor atoms. A complex ion that is associated with one or more counter ions is called a coordination compound. For example [PdCl4]2âis a complex ion, and Na[PdCl4] is a coordination compound. The following table lists some common ligands.
| Part A What is the coordination number for each of the following complexes or compounds?[Co(NH3)4Cl2]+ [Cr(EDTA)]â [Zn(H2O)4]2+ Na[Ag(CN)2] Enter the coordination numbers, in the order that the complexes are listed, as four integers separated by commas (e.g., 1,2,3,4). View Available Hint(s) Submit Part B What is the charge on each of the following complex ions?hexaaquamanganese(II), [Mn(H2O)6]? tris(carbonato)aluminate(III), [Al(CO3)3]? amminepentachloroplatinate(IV), [Pt(NH3)Cl5]? Express the charges numerically, in the order that the complexes are listed, separated by commas. For a nonzero charge, be sure to include the sign (e.g., +1,-2,+3). View Available Hint(s) Submit Part C What is the oxidation number of the central metal ion in each of the following complexes or compounds?[NiCl2Br2]2â [Cr(H2O)2(NH3)4]3+ Na[Au(CN)2] Express the oxidation numbers numerically, in the order that the complexes are listed, separated by commas. For a nonzero oxidation number, be sure to include the sign (e.g., +1,-2,+3). View Available Hint(s) Submit |