الله 88 CO H₂ H₂ H₂ NO: H₂ 100 MHz COSY of 1,3-dinitrobenzene. At the left-hand edge and at the top is the ID NMR. Deduce the coupling partners and assign the peaks
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can someone help me understand how to assign the peaks and deduce coupling partners of that compound.
- In 1H NMR spectrum one frequency axis and one intensity axis is present.
- But in 2 dimensional spectra 1 H -1 H correlation in which both frequency axes show 1 H chemical shift. This is called as 1 H -1 H shift correlated spectroscopy i. e. COSY ( Correlated spectroscopy)
- Cosy can determine which proton is coupled with which proton.
- In COSY spectrum 1 H NMR is present on both x and y axes and signals are repeated yet again as spots on the diagonal.
- In COSY, off-diagonal peaks are important, they also called as cross peaks.
- The diagonal is drawn from upper right corner to lower left corner.
- If proton couples with another proton then horizontal line drawn from cross peak will intercept a contour on the diagonal and vertical line from the same cross peak will intercept another contour on the diagonal.
- Cross peaks are present on both the side of diagonal but for the interpretation only one side of the diagonal is considered.
- Because the cross peaks on the above the diagonal and below the diagonal gives same information.
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