Domanda del libro di testo
Although Cl- is a weak-field ligand and CN- is a strong field ligand, [CrCl6]3- and [Cr(CN)6]3- exhibit approximately the same amount of paramagnetism. Explain.
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Ch.21 - Transition Elements and Coordination Chemistry
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- 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
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McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblema 21.95
McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblema 21.95Capitolo 21, Problema 21.95
The glycinate anion, gly-= NH2CH2CO2 -, bonds to metal ions through the N atom and one of the O atoms. Using to represent gly-, sketch the structures of the four stereoisomers of Co(gly)3.
Guida verificata passo dopo passo1
Identify the coordination geometry of the complex. Cobalt(III) typically forms octahedral complexes.
Recognize that each glycinate ligand is bidentate, meaning it can form two bonds with the metal center, one through the nitrogen atom and one through an oxygen atom.
Consider the possible arrangements of the three bidentate ligands around the cobalt center. In an octahedral complex, these can lead to different stereoisomers.
Determine the possible stereoisomers: In an octahedral complex with three bidentate ligands, there are two main types of stereoisomers: facial (fac) and meridional (mer).
Sketch the structures: For the fac isomer, all three ligands are adjacent to each other, forming a face of the octahedron. For the mer isomer, the ligands are arranged such that they form a meridian around the metal center.
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Stereoisomerism
Stereoisomerism refers to the phenomenon where compounds have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of those atoms. In coordination chemistry, stereoisomers can arise from the different ways ligands can be arranged around a central metal ion, leading to distinct geometric configurations such as cis and trans forms.
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01:56
Stereoisomers
Coordination Complexes
Coordination complexes consist of a central metal atom or ion bonded to surrounding molecules or anions called ligands. The nature of these bonds and the arrangement of ligands around the metal ion determine the properties and reactivity of the complex. In this case, the glycinate anion acts as a bidentate ligand, coordinating through both nitrogen and oxygen atoms.
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00:43Coordination Complexes Example
Chirality
Chirality is a property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. In coordination complexes, chirality can arise when a metal center is bonded to ligands in such a way that it creates asymmetric arrangements. The presence of chiral ligands, like glycinate, can lead to the formation of enantiomers, which are important in biological systems.
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02:37Chirality
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What is the oxidation state of the metal in each of the complexes?
a. [Ni(CN)5]3–
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c. [Co(en)2(H2O)Br]2+
d. [Cu(H2O)2(C2O4)2]2–
e. Co(NH3)3(NO2)3
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The Ni2+(aq) cation is green, but Zn2+(aq) is colorless. Explain.
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Predict the crystal field energy-level diagram for a square pyramidal ML5 complex that has two ligands along the axes but only one ligand along the z axis. Your diagram should be intermediate between those for an octahedral ML6 complex and a square planar ML4 complex.
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Draw a crystal field energy-level diagram for a square planar complex, and explain why square planar geometry is especially common for d8 complexes.
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