May04_2005_2pp

May04_2005_2pp - May 4, 2005 Final Exam Stuff Info Page:...

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1 May 4, 2005 Final Exam Stuff Info Page: Now Online! When? Tuesday, May 10th, 4:00 pm Where? Here (B203 Angell) Review Session: Monday, 1:30 pm (B203 Angell) NMR Prob Set Solutions: Now Online! 2 Quantifying Spin-Spin Splitting ± Spin-spin splitting is quantified by: J: Coupling Constant ± J is reported in absolute units (frequency, Hz) and is typically 1-20 Hz ± J depends only on the electronic and steric relationships between interacting nuclei ± Thus, J is independent of spectrometer B o
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3 Effects of MagField on Spectrum? J: unaffected δ : Resolution: (Hz/ppm) B o 4 Chemical Shift Trends ¾ δ as an indicator of e - density -recall our first example: CH 4 CH 3 Cl CH 2 Cl 2 CHCl 3 δ (ppm) : 0.23 3.05 5.33 7.24 Decreasing e - density •But, chemical shifts do not only follow electron density . . . Examples?
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5 Other Chemical Shift Effects: Magnetic Anisotropy ± Delocalized electrons •“ring current” due to motion of electrons in delocalized
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May04_2005_2pp - May 4, 2005 Final Exam Stuff Info Page:...

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