Textbook Question
What is the oxidation state of the metal in each of the complexes?
a. [Ni(CN)5]3–
b. Ni(CO)4
c. [Co(en)2(H2O)Br]2+
d. [Cu(H2O)2(C2O4)2]2–
e. Co(NH3)3(NO2)3
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Ch.21 - Transition Elements and Coordination Chemistry
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McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblem 21.78b
McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblem 21.78bChapter 21, Problem 21.78b
What is the systematic name for each of the following ions?
(c) [Co(CO3)3]3-
(d) [Pt(en)2(SCN)2]2+
Verified step by step guidance1
Identify the central metal ion in each complex: (c) Cobalt (Co), (d) Platinum (Pt).
Determine the oxidation state of the central metal ion by considering the charges of the ligands and the overall charge of the complex: (c) Carbonate (CO_3) is a -2 charge ligand, (d) Ethylenediamine (en) is a neutral ligand and thiocyanate (SCN) is a -1 charge ligand.
For complex (c), calculate the oxidation state of cobalt: Let x be the oxidation state of Co. The equation is x + 3(-2) = -3. Solve for x.
For complex (d), calculate the oxidation state of platinum: Let y be the oxidation state of Pt. The equation is y + 2(0) + 2(-1) = +2. Solve for y.
Name the complexes using the IUPAC naming conventions: (c) Use the oxidation state of cobalt and the name of the ligands to form the name. (d) Use the oxidation state of platinum and the name of the ligands to form the name.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Coordination Compounds
Coordination compounds consist of a central metal atom bonded to surrounding molecules or ions called ligands. The arrangement and type of ligands influence the properties and naming of the compound. Understanding the structure of coordination complexes is essential for determining their systematic names.
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01:32
Coordination Compound Naming
Ligands and Their Naming
Ligands are ions or molecules that donate electron pairs to the central metal atom in a coordination complex. They can be classified as monodentate, bidentate, or polydentate based on the number of donor atoms. The naming of ligands follows specific conventions, such as using prefixes to indicate the number of ligands present.
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02:03Ligand Naming
Oxidation States and Charge
The oxidation state of a metal in a coordination compound is crucial for determining its systematic name. The overall charge of the complex ion must be considered, as it affects the naming convention. For example, the oxidation state of cobalt in [Co(CO3)3]3- must be calculated to accurately name the compound.
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