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CH_318N_Lecture5-08_Spring_08

CH_318N_Lecture5-08_Spring_08 - Lecture 5 Still More...

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1 Chemistry 318N Lecture 5 Still More spectroscopy January 31, 2008 2680 2675 2670 2665 2660 2655 2650 2645 2640 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 2643.65 2647.85 2649.93 2654.13 2656.23 2660.43 2662.55 2666.75 Cl O C H 3 H H a b c Chemistry 318N An Unknown C 5 H 10 O 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13
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2 Chemistry 318N Calculate the Unsaturation Number Should be C n H 2n+2 +1 = C 8 H 19 but it is… C 8 H 9 Missing H 10 So number is…. 10/2=5! Add one H for N N H H H C 8 H 9 N Chemistry 318N Origins of Signal Splitting Magnetic field of H b adds to the applied field; H a signal appears at a lower applied field Magnetic field of H b subtracts from the applied field; H b signal appears at a higher applied field H b H b H a B 0 Remember…it is the NET field that counts
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3 Chemistry 318N Origins of signal splitting one spin two spins three spins no neighbors Chemistry 318N Who needs DNA??
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4 Chemistry 318N Relative Intensity of Peaks 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 singlet double triplet quartet quintete sextete Pascal’s triangle The binomial coefficients Chemistry 318N Sample spectra 2.50
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