Spectroscopic evidence of a bidentate-binding of meso-2,3-dimercaptosuccinic acid on silver nanoclusters

► Synthesized Ag7DMSA4 nanoclusters were studied by TEM/EDS, NMR, IR, Raman, and DFT. ► A model of sulfur bidentate-binding was proposed. ► DFT calculations suggest a deprotonation of DMSA in Ag7DMSA4 nanoclusters.