Electronic Spectroscopy NMR Powerpoint Templates Page 1 I

Electronic Spectroscopy NMR Powerpoint Templates Page 1

μ=γI Isotope 1 H 2 H 11 B 13 C 15 N 17 O 19 F 29 Si 31 P Natural % Magnetic Magnetogyric Spin (I) Abundance Moment (μ)* Ratio (γ)† 99. 9844 0. 0156 81. 17 1. 108 0. 37 0. 037 100. 0 4. 700 100. 0 1/2 1 3/2 1/2 5/2 1/2 1/2 2. 7927 0. 8574 2. 6880 0. 7022 -0. 2832 -1. 8930 2. 6273 -0. 5555 1. 1305 26. 753 4, 107 8, 5847 6, 728 -2, 713 -3, 628 25, 179 -5, 319 10, 840 * μ in units of nuclear magnetons = 5. 05078 • 10 -27 JT-1 † γ in units of 107 rad T-1 sec-1 Powerpoint Templates Page 2

E = - μ. B 0 Nuclear Spins in B 0 ΔE = γB 0 h/2π Powerpoint Templates Page 3

Values for H atom Applied field strength of 7. 05 T – 1 H is approximately 0. 120 J/mol, which corresponds to a frequency of 300 MHz – 13 C is approximately 0. 030 J/mol, which corresponds to a frequency of 75 MHz Powerpoint Templates Page 4

ω = γB 0 Larmour frequency Powerpoint Templates Page 5

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For 2. 35 T (= 100 MHz) and 300 K one gets for 1 H a population difference N(α) - N(β) of ca. 8. 10 -6 Powerpoint Templates Page 7

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Spin Lattice Relaxation Powerpoint Templates Page 9

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Chemical shift Powerpoint Templates Page 13

Chemical shift (δ): The shift in ppm of an NMR signal from the signal of TMS Powerpoint Templates Page 14

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Direct Coupling 1 J Powerpoint Templates Page 21

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Geminal Coupling 2 J diastereotopic Powerpoint Templates Page 23

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Vicinal Coupling 3 J Atoms three bonds apart, the coupling is called vicinal coupling Powerpoint Templates Page 25