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2D COSY NMR Correlation Spectroscopy

Interactive 2D canvas COSY NMR correlation-spectrum simulator: pick a real spin system, watch the diagonal chemical-shift peaks and off-diagonal J-coupling cross-peaks render as a live contour map, and click any peak to see exactly which protons it identifies and how that maps onto the molecule's structure.

Chemistry & Materials2DAdvanced60 FPS📱 Mobile-adapted⇄ 3D version

COSY turns a one-dimensional proton NMR spectrum into a two-dimensional correlation map: peaks sit on the diagonal exactly as in a 1D spectrum, but protons that are scalar-coupled through 2–3 bonds throw off symmetric off-diagonal cross-peaks. This 2D canvas version renders that correlation map the way real acquisition software (TopSpin, MestReNova) actually displays it — a flat contour/heatmap of intensity over the (δ₁, δ₂) plane — for three real spin systems (1-propanol, ethyl acetate, ethylbenzene), each with a different J-coupling network. Adjust the acquisition linewidth and intensity gain, toggle the cross-peaks on and off to isolate the diagonal, and click directly on any peak to see which proton it is, or which two coupled protons a cross-peak connects and where that bond sits in the molecule's structure.

⚙ Under the hood

Pick a real spin system and watch its COSY NMR correlation map render live, then click any diagonal or cross-peak to see exactly which J-coupled protons it identifies.

nmrcosyspectroscopyj-couplingorganic-chemistry2d

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install