Back Donation and Higher Oxidation States in Transition Metal Complexes

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In organometallic complexes, which of the following is true?

Oxidation state accurately represents the real charge on the metal

Ferrocene contains Fe2+ ions (correct)

They contain ionic bonds

WH6 L3 is closer to WO3 in terms of real charge on the metal

Which type of metals generally produce high-valent species with high oxidation states?

Third-row metals (correct)

Noble metals

Second-row metals

Transition metals

Why is back donation severely reduced in higher oxidation states?

Increased availability of nonbonding d electrons (correct)

More available f electrons

Strong stabilization of d levels due to partial negative charge

Decreased partial positive charge on the metal

What type of ligands can make high oxidation states accessible?

Small and non-π-bonding ligands like H or Me Signup and view all the answers

Why is it cautioned not to read too much into oxidation states and d n configurations?

They are a formal classification only Signup and view all the answers

What makes the outer electrons of third-row metals more available for high oxidation states?

'f' electrons shielding Signup and view all the answers

What type of model plays a dominant role in classical coordination chemistry?

Ionic model Signup and view all the answers

Which model has grown in importance parallel to the rise of organometallic compounds?

Covalent model Signup and view all the answers

Why is it important to be familiar with both models in coordination chemistry?

To interpret literature correctly Signup and view all the answers

What is the symbol 'X' used to represent in terms of ligands?

1e X ligands on covalent model Signup and view all the answers

Which type of ligand can be a π-bond donor according to the text?

$C_2H_4$ Signup and view all the answers

What do ligands like CO and $NH_3$ signify in terms of electron counts?

$H$ donors Signup and view all the answers

What is the purpose of the 18e rule in organometallic chemistry?

To help select the appropriate reagent in reactions Signup and view all the answers

How does the electron count affect the oxidation state of a metal in a complex?

The lower the electron count, the higher the oxidation state Signup and view all the answers

Which type of geometry do some d 8 metals prefer due to having 16 electrons?

Square planar Signup and view all the answers

What is the oxidation state of Cp2Fe based on its ligands?

Fe(II) Signup and view all the answers

In Eq. 2.5, what happens when an X− group replaces an L ligand?

No change in electron count Signup and view all the answers

What is required for a complex to retain its 18e configuration when converting a 1e alkyl group into a 2e alkene group?

Positive charge and loss of H+ Signup and view all the answers