The following linker molecules were used for quantitative 1 H NMR analysis: 2-methylimidazole (2-MeImH), 2-ethylimidazole (2-EtImH) and terephthalic acid (bdc). Prior to the measurements of the digested MOF samples, a calibration curve was prepared for each linker to determine the accuracy and precision of the concentration determination through NMR. Prior to choosing the appropriate acquisition parameters, we measured the longitudinal relaxation time (T1) to ensure proper relaxation of all nuclei. Additionally, we verified that the excitation profile of the hard pulses was uniform and with error < 1%, which was the chosen minimum for our experiments. Acquisition parameters for all recorded datasets were the following: relaxation delay time = 30 s, pulse angle = 30°, acquisition time = 3.2 s, number of hypercomplex points = 16384, number of scans = 32, dummy scans = 0, total measurement time = 16 min. Processing of the NMR spectra was performed using Bruker's TopSpin (version 4.3.0) and involved zero-filling the free induction decay (FID) signal up to a total of 128k real datapoints (si = 128k), exponential multiplication (LB = 0.3 Hz), Fourier transform (ft), automatic phase correction (apk) and automatic baseline correction (absn). Analysis of the spectra is described in the paragraph below.