Curve fitting gives the self-diffusion coefficient (D) as the other parameters are known (γ = gyromagnetic ratio = 4.258 × 10³ s^-1 G^-1). DOSY plots are processed in 2D through a Laplace transform. The 2D presentation has diffusion coefficients D along the y-axis and chemical shift along the x-axis (Figure S2 ).

Diffusion of D₂O:H₂O (1:1 v/v) standard with known D (2.1 x 10^-9 m²/s at 25°C was routinely examined to calibrate G and ensure reproducible experimental conditions, Gcal value = 0.00190 G/cm/DAC. DOSY observation time (Δ) was fixed, usually at 140 ms. Plots of echo intensity I (y-axis) versus the gradient area squared (γG_zδ)²(∆-δ/3) in ns/m² (x axis) yielded D, Figure S3.