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2D COSY NMR Correlation Spectroscopy

Interactive 3D COSY (Correlation Spectroscopy) NMR simulator: build the 2D proton correlation map for real spin systems, watch diagonal peaks and off-diagonal J-coupling cross-peaks rise as a 3D contour surface, and read which protons are scalar-coupled to which.

Chemistry & Materials3DAdvanced60 FPS📱 Mobile-adapted

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 simulator renders that 2D map as a live 3D contour surface — an InstancedMesh column for every (δ₁, δ₂) grid cell, height driven by the sum of Gaussian peak functions — for three real spin systems (1-propanol, ethyl acetate, ethylbenzene), each with a different J-coupling network. Adjust the acquisition linewidth and vertical scale, toggle the cross-peaks on and off to isolate the diagonal, and orbit the surface to see exactly which protons are talking to which.

⚙ Under the hood

Build a live 2D COSY proton NMR correlation map as a 3D contour surface for real spin systems, and see how scalar (J-)coupled protons produce off-diagonal cross-peaks alongside the diagonal chemical-shift peaks.

nmrcosyspectroscopychemistryj-coupling3d

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install