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Chapter 4 69
4.2.1.2 The incorporation amount of DLs as well as the composition of the
materials
The incorporation and quantification of DLs have been initially testified by NMR
spectroscopy of the digested samples after activation and the assessment of porosity
(Table 4.1). Thus, in the 1 H-NMR spectra of the samples 1a-d, appearance of two
additional peaks (compared with the parent Ru-MOF) at 7.51 ppm and 7.89 ppm is clearly
seen (Figure 4.9). These two resonances can be assigned to the aromatic protons of 5-OHip
linkers. Expectedly, upon increasing the feeding amount of the DL (5-OH-ipH2), the
intensities of its characteristic resonances also increases in the digested sample solution.
Figure 4.9. 1 H-NMR spectra of the Ru-DEMOFs (1a-1d) digested in DCl/DMSO-d 6 mixture. DL is
5-OH-ip. H 3 O + comes from H 2 O and HCl contained in DCl. Due to the sensitivity of H 2 O peak to the
solution conditions, the proton resonance of H 3 O + varies here in the range of 4-6 ppm, dependent
on pH value of the total solution.