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Evidence for ligand attachment on the organic pigment nanocrystal surfaces. (a) Homonuclear H–H NOESY reveals correlations between protons of the quinacridone and the oleate ligands as evidence for ligand attachment. (b) HMBC map of quinacridone with oleate ligands and (c) of oleic acid exhibit shifted signatures for the H2–C1 bond. The numeration of the atoms is shown in the inset of (a).
