MagneticEquivalencestudent

MagneticEquivalencestudent - Magnetic vs Chemical...

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7/27/2011 1 Magnetic vs. Chemical Equivalence Today: Magnetic equivalence Non first order spectra First order vs. second order spectra Causes of 2 nd order splitting: Strong coupling : If Δν between two signals is near J between two signals, then second order spectra result, Δν /J > 10 On 60 MHz, Δν = 1.5 ppm, J = 7 Hz Δν = 1.5 ppm (60 Hz/ppm) = 90 Hz Δν /J = 90 Hz/7Hz = 13 1 st order spectrum
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7/27/2011 2 First order vs. second order spectra Causes of 2 nd order splitting: Strong coupling : On 60 MHz, Δν = 0.3 ppm, J = 7 Hz Δν = 0.3 ppm (60 Hz/ppm) = 18 Hz Δν /J = 18 Hz/7Hz = 2.6 2 nd order spectrum On 400 MHz, Δν = 0.3 ppm, J = 7 Hz Δν = 0.3 ppm (400 Hz/ppm) = 120Hz Δν /J = 120 Hz/7Hz = 17 1 st order spectrum What are second order spectra? One uses ABX nomenclature to differentiate between the proton signals. AX and all other first order systems (AX 2 , AMX, A 3 X 2 , etc.) AB (line intensities start to lean, J can be measured, δ has to be calculated) AB 2 (extra lines, both J and δ
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