Domanda del libro di testo
Draw the structure of the following complexes. What are the oxidation state, coordination number, and coordination geometry of the metal in each?
(a) Pt(en)2
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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 72b
McMurry 8th EditionCh.21 - Transition Elements and Coordination ChemistryProblema 72bCapitolo 21, Problema 72b
Draw the structure of the following complexes. What are the oxidation state, coordination number, and coordination geometry of the metal in each?
(b) [Cr(NH3)2(C2O4)2]NO2
Guida verificata passo dopo passo1
Determine the oxidation state of Cr: Assume the oxidation state of Cr is x. Ammonia (NH3) is a neutral ligand, and oxalate (C2O4) is a bidentate ligand with a charge of -2. The complex is overall neutral, so x + 2(0) + 2(-2) = 0. Solve for x.
Identify the coordination number: Count the number of ligand donor atoms attached to the metal. Each NH3 contributes 1 donor atom, and each C2O4 contributes 2 donor atoms. Calculate the total.
Determine the coordination geometry: Based on the coordination number, predict the geometry. Common geometries include octahedral, tetrahedral, and square planar.
Draw the structure: Arrange the ligands around the metal center according to the determined geometry. Indicate the bidentate nature of the oxalate ligands.
Consider the counterion: Note that NO2 is the counterion and does not affect the coordination sphere of the complex.
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Concetti chiave
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Oxidation State
The oxidation state of an element in a compound indicates the degree of oxidation of that element, reflecting the number of electrons lost or gained. In coordination complexes, the oxidation state of the metal can be determined by considering the charges of the ligands and the overall charge of the complex. For example, in [Cr(NH3)2(C2O4)2]NO2, the oxidation state of chromium can be calculated based on the charges contributed by the ammonia and oxalate ligands.
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Percorso guidato
02:42
Oxidation Numbers
Coordination Number
The coordination number refers to the total number of ligand atoms that are directly bonded to the central metal atom in a coordination complex. It is determined by the number of donor atoms from the ligands that coordinate to the metal. In the case of [Cr(NH3)2(C2O4)2], the coordination number can be assessed by counting the donor atoms from the two NH3 ligands and the two oxalate ligands.
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00:27Coordination Numbers
Coordination Geometry
Coordination geometry describes the spatial arrangement of the ligands around the central metal atom in a coordination complex. Common geometries include octahedral, tetrahedral, and square planar, which depend on the coordination number and the steric and electronic properties of the ligands. For [Cr(NH3)2(C2O4)2], the coordination geometry can be inferred from the coordination number and the nature of the ligands involved.
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02:40Molecular Geometry of Coordination Complexes
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Draw the structure of the following complexes. What are the oxidation state, coordination number, and coordination geometry of the metal in each?
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(a) Identify the Lewis acid and the Lewis base in the reaction of ethylenediamine (H2NCH2CH2NH2) with Ni2+ to form [Ni(en)3]2+.
(b) Identify the ligands and donor atoms.
(c) Give the coordination number and geometry of the metal in the complex.
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