The extensive impact of non-coordinating tails lies in the intermolecular ligand-ligand interaction. Conventionally, the interaction strength is derived from calorimetric measurements of ligand exchange reaction or dynamics light scattering measurements of NCs that disperse/precipitate in solution . These bulk measurement methods lack specificity on the target ligands and overlook molecular details. Nuclear magnetic resonance (NMR), with a high resolution of organic functionalities, is a preferred tool to pinpoint the ligands on NCs . For instance, different NMR approaches have been used to study ligand coordination structures , the ligand exchange processes , and even the surface distributions of ligands . However, no existing NMR method provides quantitative information on the ligand-ligand interaction, because weak intermolecular forces leave only minute and intractable impact on NMR energy levels, i.e., the chemical shifts.