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In the cobalt-carbonyl complex: [Co2(CO)8], the number of Co-Co bonds is 'X' and that of terminal CO ligands is 'Y'. X + Y = _______.
 (in integer)
    Correct answer is '7'. Can you explain this answer?
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    In the cobalt-carbonyl complex: [Co2(CO)8], the number of Co-Co bonds ...
    Explanation:

    Cobalt-carbonyl complex [Co2(CO)8] is a common example of a binuclear metal-carbonyl complex. It consists of two cobalt atoms bridged by three μ2-carbonyl groups and one μ3-carbonyl group.

    The structure of the complex can be represented as follows:

    Co - μ3-CO - Co

    | |

    CO CO

    | |

    CO CO

    | |

    CO

    The number of Co-Co bonds (X) in the complex is 1.

    The number of terminal CO ligands (Y) in the complex is 8.

    Therefore, X Y = 1 x 8 = 8.

    Hence, the correct answer is '8'.

    Note: The question has an incorrect answer. The correct answer should be '8', not '7'.
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    Community Answer
    In the cobalt-carbonyl complex: [Co2(CO)8], the number of Co-Co bonds ...
    Structure of Co2(CO)8:

    Number of Co-Co bonds = 1 = X
    Number of terminal CO ligands = 6 = Y
    ∴ X + Y = 1 + 6 = 7
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    Crystal field theory views the bonding in complexes as arising from electrostatic interaction and considers the effect of the ligand charges on the energies of the metal ion d-orbitals.In this theory, a ligand lone pair is modelled as a point negative charge that repels electrons in the d-orbitals of the central metal ion. The theory concentrated on the resulting splitting of the d-orbitals in two groups with different energies and used that splitting to rationalize and correlate the optical spectra, thermodynamic stability, and magnetic properties of complexes. This energy splitting between the two sets of dorbitals is called the crystal field splitting D.In general, the crystal field splitting energy D corresponds to wavelength of light in visible region of the spectrum, and colours of the complexes can therefore be attributed to electronic transition between the lower-and higher energy sets of d-orbitals.In general, the colour that the we see is complementry to the colour absorbed.Different metal ion have different values of D, which explains why their complexes with the same ligand have different colour.Similarly, the crystal field splitting also depends on the nature of ligands and as the ligand for the same metal varies from H2O to NH3 to ethylenediamine, D for complexes increases. Accordingly, the electronic transition shifts to higher energy (shorter wavelength) as the ligand varies from H2O to NH3 to en, thus accounting for the variation in colour.Crystal field theory accounts for the magnetic properties of complexes in terms of the relative values of and the spin pairing energy P. Small values favour high spin complexes, and large Dvalues favour low spin complexes.The [Ti(NCS)6]3- ion exhibits a single absorption band at 544 nm. W hat will be the crystal field splitting energy (KJ mol-1) of the complex ? (h = 6.626 x 10-34 J.s ; C = 3.0 x 108 m/s; NA = 6.02 x 1023 ions/mole.

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    In the cobalt-carbonyl complex: [Co2(CO)8], the number of Co-Co bonds is X and that of terminal CO ligands is Y. X + Y = _______.(in integer)Correct answer is '7'. Can you explain this answer?
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