P(Me)3 P(Me)3 Re 0 3. (14 pts) For the rhenium complex A, a change in hapticity of the cyclopentadienyl (Cp) ligand occurs with the addition of P(Me)3. Answer the following questions about this phenomenon. How many resonances do you expect to see in the 1H NMR spectrum of the η 1 a. complex C? Explain. b. The researchers who observed this phenomenon confirmed the structure of complex C by X-ray diffraction analysis. At room temperature, the H NMR spectrum of the compound only displayed one signal for the Cp ligand (at 6.15 ppm). Is that consistent with ηι coordination of the Cp ligand? Provide a brief explanation for this observation. c. The researchers also performed the H NMR experiments of C at low temperature (-87 °C), and still observed the same solitary signal as in the room-temperature spectrum. Briefly explain this observation. P(Me)3 P(Me)3 Re 0 3. (14 pts) For the rhenium complex A, a change in hapticity of the cyclopentadienyl (Cp) ligand occurs with the addition of P(Me)3. Answer the following questions about this phenomenon. How many resonances do you expect to see in the 1H NMR spectrum of the η 1 a. complex C? Explain. b. The researchers who observed this phenomenon confirmed the structure of complex C by X-ray diffraction analysis. At room temperature, the H NMR spectrum of the compound only displayed one signal for the Cp ligand (at 6.15 ppm). Is that consistent with ηι coordination of the Cp ligand? Provide a brief explanation for this observation. c. The researchers also performed the H NMR experiments of C at low temperature (-87 °C), and still observed the same solitary signal as in the room-temperature spectrum. Briefly explain this observation.