Back Donation and Higher Oxidation States in Transition Metal Complexes
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Questions and Answers

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?

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

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

    <p>They are a formal classification only</p> Signup and view all the answers

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

    <p>'f' electrons shielding</p> Signup and view all the answers

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

    <p>Ionic model</p> Signup and view all the answers

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

    <p>Covalent model</p> Signup and view all the answers

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

    <p>To interpret literature correctly</p> Signup and view all the answers

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

    <p>1e X ligands on covalent model</p> Signup and view all the answers

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

    <p>$C_2H_4$</p> Signup and view all the answers

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

    <p>$H$ donors</p> Signup and view all the answers

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

    <p>To help select the appropriate reagent in reactions</p> Signup and view all the answers

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

    <p>The lower the electron count, the higher the oxidation state</p> Signup and view all the answers

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

    <p>Square planar</p> Signup and view all the answers

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

    <p>Fe(II)</p> Signup and view all the answers

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

    <p>No change in electron count</p> 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?

    <p>Positive charge and loss of H+</p> Signup and view all the answers

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