Textbook Question
For each of the following complexes, draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons.
(a) [CrF6]3-
(b) [V(H2O)6]3+
(c) [Fe(CN)6]3-
Ch.21 - Transition Elements and Coordination Chemistry
McMurry8th EditionChemistryISBN: 9781292336145
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Table of contents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Chapter 21, Problem 21.80
What is the systematic name for each of the following coordination compounds?
(c) [Co(NH3)4Br2]Br
(d) Cu(gly)2
Verified step by step guidance1
Identify the central metal ion in each coordination compound. For (c), the central metal is cobalt (Co), and for (d), it is copper (Cu).
Determine the oxidation state of the central metal ion. For (c), consider the charge of the ligands and the overall charge of the complex. For (d), use the fact that glycine (gly) is a neutral ligand.
Name the ligands in alphabetical order. For (c), the ligands are ammine (NH_3) and bromo (Br). For (d), the ligand is glycinato (gly).
Combine the names of the ligands with the metal, including its oxidation state in Roman numerals. For (c), use the format: ligand names + metal name + oxidation state. For (d), use the format: ligand name + metal name + oxidation state.
For (c), since the complex ion is a cation, the name of the complex is followed by the name of the counterion (bromide). For (d), since there is no counterion, the name of the complex is complete.
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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 or ion bonded to surrounding molecules or ions, known as ligands. The nature of these ligands and their arrangement around the metal center significantly influence the properties and reactivity of the compound. Understanding the structure and bonding in coordination complexes is essential for naming them systematically.
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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 compound. They can be classified as monodentate (binding through one atom) or polydentate (binding through multiple atoms). The naming of ligands follows specific conventions, such as using prefixes to indicate the number of ligands and specific names for common ligands like ammonia (NH3) and bromide (Br-).
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02:03Ligand Naming
Systematic Naming of Coordination Compounds
The systematic naming of coordination compounds follows the IUPAC nomenclature rules, which dictate the order of naming the ligands, the metal, and its oxidation state. Ligands are named first in alphabetical order, followed by the metal name, which may include a Roman numeral to indicate its oxidation state. This systematic approach ensures clarity and consistency in the identification of coordination compounds.
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01:32Coordination Compound Naming
Related Practice
Textbook Question
Which of the following complexes are paramagnetic?
(a) [Mn(CN)6]3-
(b) [Zn(NH3)4]2+ (tetrahedral)
(c) [Fe(CN)6]4-
(d) [FeF6]4-
Textbook Question
Draw a crystal field energy-level diagram, assign the electrons to orbitals, and predict the number of unpaired electrons for each of the following.
(a) [Cu(en)3]2+
(b) [FeF6]2-
(c) [Co(en)3]3+ (low spin)
Textbook Question
Look at the colors of the isomeric complexes in Figure 21.12, and predict which is the stronger field ligand, nitro (-NO2) of nitrito (-ONO). Explain.
Textbook Question
The amount of paramagnetism for a first-series transition metal complex is related approximately to its spin-only magnetic moment. The spin-only value of the magnetic moment in units of Bohr magnetons (BM) is given by sqrt(n(n + 2)), where n is the number of unpaired electrons. Calculate the spin-only value of the magnetic moment for the 2+ ions of the first-series transition metals (except Sc) in octahedral complexes with (a) weak-field ligands and (b) strong-field ligands. For which electron configurations can the magnetic moment distinguish between high-spin and low-spin electron configurations?
Textbook Question
What hybrid orbitals are used by the metal ion and how many unpaired electrons are present the complex ion [VCl4]- with tetrahedral geometry?
(a) sp3; 2 unpaired electrons
(b) sp3; 3 unpaired electrons
(c) sp3d2; 3 unpaired electrons
(d) sp3d2; 4 unpaired electrons