[Au24Pt(TBBT)18] 0 (2). NC 2 was synthesized using a previously reported method with slight modifications. After dissolving 5.0 mg of NC 1 in 3.4 mL of toluene, 500 µL of TBBTH (98%, FUJIFILM) was added to the solution at 60 °C, and the mixture was stirred for 1.5 h to allow the ligand exchange reaction to proceed. The resulting product was washed with ultrapure water and a mixture of ultrapure water and methanol and extracted with dichloromethane. Finally, the products were separated by PTLC (dichloromethane:hexane = 7:13), and the top layer was scraped off and dissolved in dichloromethane to give NC 2 (Scheme S2). The optical absorption spectrum of this product matched that of NC 2, which we reported in an earlier publication, and the ESI spectrum confirmed the presence of NC 2 as the main product, indicating that the same product was synthesized through the present modified method (Figure ).