Atomic orbital factors affecting interactions between

The pi bond between the metal and carbon atom arises as a result of a backbonding interaction between a filled metal rf-orbital of the appropriate symmetry and the empty pi star orbital of the carbonyl. Any factor that increases the electron density at the metal will increase the strength of the MC pi bond, and thus the contribution from resonance form b. The result is a decrease in the CO bond order and a resulting decrease in the CO stretching frequency in the infra-red spectrum of the complex. Aspects which affect the DR. spectrum of metal carbonyl derivatives include the cf-electron count of the metal, the donor properties of the ligands and the charge on the complex. For example, in case of [W(CO)5Cl] and... 

An understanding of the factors affecting the rate coefficient for reaction between an ion and a neutral atom or molecule centres on the calculation of the capmre rate coefficient. Capture brings the reactants into sufficiently close proximity for chemical interaction to occur and reaction to take place. Intermolecular forces were discussed in Sect. 1.4 for the reaction A + B. The attractive potential varies as Rab > where Rab is the distance between A and B. The effective potential energy, Veff (Rab)< is obtained by adding the energy of orbital motion of A and B, giving ... 

---