Question

Please answer the following questions, show all steps clearly.

The protons of TMS have some of the largest shielding constants known which causes them to have some of the lowest Larmor frequencies. Do you expect the same situation for the Larmor frequency of the^13C resonance of TMS? Explain your reasoning. Draw the energy level diagram for an AX spin-spin system for which the spins are uncoupled and then again for when they are coupled. Label all states and energy levels in both diagrams. Label all transitions in the coupled system only.

Answer 1

Yes. The structure of the TMS is The electron density around carbon is more in TMS causes the carbon to involve in shielding. When the carbon involves in shielding, carbon feels low frequency from the external magnetic field and resonates at high filed strength. Thus, the signal appears at low chemical shift values. Thus, the carbon of TMS have large shielding constant which causes them to have some of the lowest Larmor frequencies. 7. Consider two protons labelled as A and X when the protons are decoupled the energy level diagram is Energy levels for proton A when it is not in coupling Energy levels for proton X when it is not in coupling Draw the energy level diagram for the protons A and X involves in coupling Energy level diagram for coupling between A and X protons