Extended Data Fig. 9: 1H NMR spectra of solutions.
From: Ligand-engineered bandgap stability in mixed-halide perovskite LEDs
a, MAPb(IxBr1−x)3 nanocrystals before and after treatment with E+G mixture in d8-toluene. b, Magnification of the circled region of the 1H NMR spectra in a (between 5.4 and 5.6 ppm), showing details of the proton bound to C=C of oleic acid/oleylamine. Fine structure can be seen on top of the broad resonance after ligand treatment, which is indicative of free oleic acid and oleylamine ligands. c, Systematic addition of E+G to PbI2 in d6-DMSO solutions. d, e, EDTA, glutathione and E+G in d6-DMSO (d) and D2O (e). When both ligands are combined in the E+G mixture, the individual peak positions are retained, indicating that there is no chemical interaction between the two ligands. f, Glutathione in d6-DMSO and in a mixture of d6-DMSO with D2O, showing the disappearance of the amide NH peaks (corresponding to exchangeable protons) in the presence of D2O. g, h, Systematic addition of EDTA (g) and glutathione (h) to PbI2 in d6-DMSO solutions.
