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Problem7 - 2 We have a liquid sample With mass spectroscopy...

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Problem Set 7 Chemistry 154A/254A: Quantum Chemistry Professor Song-I Han Teaching Assistant: Wang, Xiqing (Francis) Office: Chemistry 3223 Office: Chem 1126/ Dahlquist Lab (1 th floor) Office hours: Tue, Th 4-5 pm Office hours: Wed 1-2 pm and Fr 4-5pm Email: [email protected] Email: [email protected] 1. You have performed a 90x-180x-echo experiment. You turned on the receiver /detector right after the 180x pulse. However, instead of observing the expected echo signal growing in and showing an maximum amplitude after time τ , you detect a signal that rather looks like an FID as follows. What does this tell you about the sample? What can be the reason for such observation?
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Unformatted text preview: 2. We have a liquid sample. With mass spectroscopy, its molecule formula has been determined to be C 5 H 12 O. To further determine what its structure is, we recorded its 1D proton spectrum and performed selective TOCSY and an INADEQUATE experiment. We found that a. there are 4 groups of proton signal in the 1D proton spectrum. b. when we applied a selective pulse to one proton that we chose in the 1D proton spectrum, no additional signal showed up. c. there were only two peaks in the INADEQUATE spectrum. Based on the information, can you draw conclusions about the molecular structure? Please explain in detail....
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