Fig. 3: Solvent effect in ULF NMR of 15N-methylpyridinium.
From: Zero- to low-field relaxometry of chemical and biological fluids
ULF NMR spectra of 15N-methylpyridinium (15N-MP) in a H2O and b D2O measured after different storage times. The peak at ≈ 80 Hz corresponds to the Larmor precession frequency of water protons while the satellite peaks correspond to the Larmor precession of 15N-MP protons (coupled to 15N). c Decay of the proton signals shown in a, 15N-MP plus H2O peaks (green triangles) and the proton signals shown in b, the 15N-MP peaks in D2O (red circles), as a function of storage time. The solid lines are the fit overlaying the data points. For the case of 15N-MP dissolved in D2O, the line is a monoexponential decay with T1 time of 2.38(3) s. For the case of 15N-MP dissolved in H2O, the line is a bi-exponential decay with T1 times of 4.8(5) s and 1.24(3), for 15N-MP and water protons, respectively.
