Chemistry

Problem

Two important physical evidences supporting the synergic bonding in non-classical complexes are bond lengths and vibrational spectra. Vibrational spectra is based on the fact that the compression and extension of a bond may be analogous to the behavior of a spring and obeys Hook's law.

\bar{\nu} = \frac{1}{2\pi c} \sqrt{\frac{k}{\mu}} \text{ cm}^{-1}

where,

k

= force constant of the bond which is directly proportional to bond strength of CO

\mu

= reduced mass of ligand

\bar{\nu}

= stretching frequency of the CO bond

c

= velocity of light In which of the following complex stretching frequency for CO ligand is least as well as bond energy of M—C bond is higher . a.

(\text{dien})\text{Mo}(\text{CO})_3

(\text{Et}_3\text{P})_3\text{Mo}(\text{CO})_3

(\text{F}_3\text{P})_3\text{Mo}(\text{CO})_3

(\text{Cl}_3\text{P})_3\text{Mo}(\text{CO})_3

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