Fig. 6. Time-dependent ESI-MS spectra from Ag₂₄ to Ag₇₀ dissolved in the solvent mixture (ⁱPrOH : CH₂Cl₂ = 1 : 1). (a) Time-dependent negative ion mode ESI-MS (collision energy: 2 V) in the range of m/z = 2000–7000 of Ag₂₄ for tracking the transformation process from Ag₂₄ to Ag₇₀. (b) ESI-MS data at different collision voltages (0, 1, 2 V) after Ag₂₄ was dissolved in the solvent mixture (ⁱPrOH : CH₂Cl₂ = 1 : 1) for three hours, and ESI-MS data after adding CF₃COOAg salt as a comparison. (c) Comparison of the transformation process from Ag₂₄ to Ag₇₀ in different solvents. (d) Time-dependent negative ion mode ESI-MS (collision energy: 2 V) in the range of m/z = 2000–4000, highlighting some key intermediates.