(16 pt) (a) Sketch the M.O. energy diagram for PCl5 (similar to PF5 you developed this in class). (i) Identify and sketch the bonding orbitals and indicate whether each contributes to: the axial bonds, the equatorial bonds or all bonds.. (ii) Calculate the bond order for one P-Cl axial bond and for one P-Cl equatorial bond. (iii) Based on your calculated bond orders, explain why axial P-Cl bonds (219 pm) are longer than equatorial bonds (204 pm). (b) Now consider the molecule SF6 which has Oh symmetry (i) Sketch the valence orbitals of S (not 3d). (ii) Make bonding combinations of these valence orbitals with appropriate sets of F 2p orbitals (consider only the F2p that point towards the sulfur atom and set the six F to lie along the x, y, and z axes).. (iii) How many combinations of the 6F atoms have you considered? How many remain? (iv) Construct a molecular orbital energy diagram for SF6 (v) Determine the bond order for S-F in SF6. (vi) Figure 5.27 in your text gives the group orbitals for 6F2p. Sketch any possible bonding combinations between the non-bonding group orbitals and S 3d orbitals. Why are these bonding interactions unlikely to be significant?
(16 pt) (a) Sketch the M.O. energy diagram for PCl5 (similar to PF5 you developed this in class). (i) Identify and sketch the bonding orbitals and indicate whether each contributes to: the axial bonds, the equatorial bonds or all bonds.. (ii) Calculate the bond order for one P-Cl axial bond and for one P-Cl equatorial bond. (iii) Based on your calculated bond orders, explain why axial P-Cl bonds (219 pm) are longer than equatorial bonds (204 pm). (b) Now consider the molecule SF6 which has Oh symmetry (i) Sketch the valence orbitals of S (not 3d). (ii) Make bonding combinations of these valence orbitals with appropriate sets of F 2p orbitals (consider only the F2p that point towards the sulfur atom and set the six F to lie along the x, y, and z axes).. (iii) How many combinations of the 6F atoms have you considered? How many remain? (iv) Construct a molecular orbital energy diagram for SF6 (v) Determine the bond order for S-F in SF6. (vi) Figure 5.27 in your text gives the group orbitals for 6F2p. Sketch any possible bonding combinations between the non-bonding group orbitals and S 3d orbitals. Why are these bonding interactions unlikely to be significant?
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