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. 2021 Aug 5;4:116. doi: 10.1038/s42004-021-00553-8

Fig. 2. 1H NMR titrations of L1 and L3 with Eu(OTf)3.

Fig. 2

a Variation in 1H NMR spectra of L1SS (1.09 × 10−3 M in 50:5:45, v/v/v of CDCl3/CD3OD/CD3CN) with Eu(OTf)3 (0.108 M in CD3OD) at 298 K. When Eu/L1SS = 0.667 eq., all the ligand signals disappeared which confirmed the metal to ligand ratio is 2–3. b Variation in 1H NMR spectra of L3SS (8.80 × 10−4 M in 50:5:45, v/v/v of CDCl3/CD3OD/CD3CN) with Eu(OTf)3 (0.090 M in CD3OD) at 298 K (bottom). When Eu/L3SS = 0.667 eq., all the ligand signals disappeared which confirmed the metal to ligand ratio is 2–3.