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Questions and Answers
What type of chemistry deals with compounds containing metal–carbon bonds?
What type of chemistry deals with compounds containing metal–carbon bonds?
- Inorganic chemistry
- Physical chemistry
- Organometallic chemistry (correct)
- Analytical chemistry
Which type of compounds are shown in Figure 13.1?
Which type of compounds are shown in Figure 13.1?
- Cluster compounds
- Sandwich compounds (correct)
- Carbide clusters
- Metal atoms with cyclic ligands
What is a characteristic of cluster compounds as mentioned in the text?
What is a characteristic of cluster compounds as mentioned in the text?
- May have ligands that bridge two or more metal atoms (correct)
- Always contain quadruple or quintuple bonds
- Contain only single metal atoms
- Do not contain any delocalized π systems
According to the text, what is the bonding feature of carbide clusters?
According to the text, what is the bonding feature of carbide clusters?
What is the main focus of organometallic chemistry as conveyed in the text?
What is the main focus of organometallic chemistry as conveyed in the text?
What is the molecular orbital structure of CO in square-planar d complexes?
What is the molecular orbital structure of CO in square-planar d complexes?
How do CO complexes exhibit interactions with metal orbitals?
How do CO complexes exhibit interactions with metal orbitals?
What does the lower energy of the C=O stretching band in IR spectra of CO complexes indicate?
What does the lower energy of the C=O stretching band in IR spectra of CO complexes indicate?
In CO complex compounds, what causes the increase in C=O bond length?
In CO complex compounds, what causes the increase in C=O bond length?
What effect does the presence of doubly bridging CO have on the C=O stretching band in IR spectra?
What effect does the presence of doubly bridging CO have on the C=O stretching band in IR spectra?
What is the 18-electron rule based on in organometallic chemistry?
What is the 18-electron rule based on in organometallic chemistry?
Which method considers each ligand as a donor of electron pairs to the metal, taking into account the charge on each ligand and the formal oxidation state of the metal?
Which method considers each ligand as a donor of electron pairs to the metal, taking into account the charge on each ligand and the formal oxidation state of the metal?
How is CO usually counted when determining electron count in organometallic chemistry?
How is CO usually counted when determining electron count in organometallic chemistry?
What does a metal–metal single bond count as when determining electron count?
What does a metal–metal single bond count as when determining electron count?
What provides useful guidelines for understanding the electronic structure and stability of many organometallic complexes?
What provides useful guidelines for understanding the electronic structure and stability of many organometallic complexes?
Which of the following is the oldest known organometallic compound?
Which of the following is the oldest known organometallic compound?
What is the notable feature of ferrocene?
What is the notable feature of ferrocene?
What is the most common ligand in organometallic chemistry after CO?
What is the most common ligand in organometallic chemistry after CO?
What type of compounds are Grignard reagents?
What type of compounds are Grignard reagents?
How are the number of bonding positions in organometallic compounds indicated?
How are the number of bonding positions in organometallic compounds indicated?
What is the total valence electron count for [Fe(CO)4]2–?
What is the total valence electron count for [Fe(CO)4]2–?
How many valence electrons does [(η5–C5H5)2Co]+ possess?
How many valence electrons does [(η5–C5H5)2Co]+ possess?
What factor helps [Zn(en)3]2+ remain stable despite being a 22-electron species?
What factor helps [Zn(en)3]2+ remain stable despite being a 22-electron species?
What determines whether complexes obey or violate the 18-electron rule?
What determines whether complexes obey or violate the 18-electron rule?
Which method is used for electron counting in organometallic chemistry?
Which method is used for electron counting in organometallic chemistry?
What is the role of the bridging CO ligand in organometallic complexes?
What is the role of the bridging CO ligand in organometallic complexes?
What happens to the Mo–Mo bond distance in organometallic complexes upon increasing the bond order from 1 to 3?
What happens to the Mo–Mo bond distance in organometallic complexes upon increasing the bond order from 1 to 3?
What is the effect of nearly linear bridging carbonyls, such as those in [(h @C5H5)Mo(CO)3]2, upon heating?
What is the effect of nearly linear bridging carbonyls, such as those in [(h @C5H5)Mo(CO)3]2, upon heating?
What leads to changes in the IR spectrum of organometallic complexes?
What leads to changes in the IR spectrum of organometallic complexes?
What happens to the Mo–CO bond upon increasing the bond order from 1 to 3 in organometallic complexes?
What happens to the Mo–CO bond upon increasing the bond order from 1 to 3 in organometallic complexes?
Flashcards
Organometallic chemistry
Organometallic chemistry
Deals with compounds containing metal–carbon bonds.
Sandwich compounds
Sandwich compounds
Compounds with metal atoms sandwiched between planar organic rings.
Cluster compounds
Cluster compounds
Ligands bridge two or more metal atoms.
Carbide clusters bonding
Carbide clusters bonding
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Organometallic Chemistry focus
Organometallic Chemistry focus
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CO in square-planar d complexes
CO in square-planar d complexes
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CO complexes interactions
CO complexes interactions
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Lower energy of C=O stretching
Lower energy of C=O stretching
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Increase in C=O bond length
Increase in C=O bond length
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Doubly bridging CO effect
Doubly bridging CO effect
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18-electron rule basis
18-electron rule basis
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Donor pair method
Donor pair method
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CO electron count
CO electron count
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Metal–metal single bond count
Metal–metal single bond count
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18-electron rule purpose
18-electron rule purpose
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Oldest organometallic compound
Oldest organometallic compound
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Ferrocene feature
Ferrocene feature
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Common organometallic ligand
Common organometallic ligand
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Grignard reagents
Grignard reagents
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Bonding positions indication
Bonding positions indication
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[Fe(CO)4]2– valence electron count
[Fe(CO)4]2– valence electron count
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[(η5–C5H5)2Co]+ electron count
[(η5–C5H5)2Co]+ electron count
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[Zn(en)3]2+ stability factor
[Zn(en)3]2+ stability factor
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18-electron rule obedience
18-electron rule obedience
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Electron counting method
Electron counting method
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Bridging CO ligand role
Bridging CO ligand role
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Mo–Mo bond distance change
Mo–Mo bond distance change
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Linear bridging carbonyls effect
Linear bridging carbonyls effect
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Changes in IR spectrum
Changes in IR spectrum
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Mo-CO bond on increasing bond order
Mo-CO bond on increasing bond order
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Study Notes
- Organometallic chemistry involves the interaction of metal atoms with a triply bridging CO ligand, which weakens the C=O bond further.
- The IR band for the C=O stretch is lower than in the doubly bridging case.
- In the doubly bridging CO mode, both metals can contribute electron density into CO p orbitals to weaken the C=O bond.
- Organometallic complexes can have a bridging CO ligand, acting as a 2-electron donor overall.
- The electron count for each Re atom in the complex is 5e, with a single electron donated to each metal.
- Nearly linear bridging carbonyls, such as those in [(h @C5H5)Mo(CO)3]2, release CO upon heating and react with it to form a product with an increased Mo–Mo bond order.
- The Mo–Mo bond distance shortens and the Mo–CO bond weakens upon increasing the bond order from 1 to 3.
- The interaction of metal d orbitals with CO p orbitals is an important factor in this reaction, leading to changes in the IR spectrum.
- The observed shifts in the IR bands are consistent with the changes in bond lengths and bond orders.
- The complex [(h @C5H5)Mo(CO)2-]2 undergoes a similar reaction when heated, with the Mo–Mo distance shortening and the Mo–CO bond weakening.
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Description
Test your knowledge of organometallic compounds and their nomenclature with this quiz, which includes identifying structures and understanding charge distribution.
