Our most successful direct exchange approach involved mixing oleate-capped UCNPs with Sn2S6 4-ligands in NMF. After sonicating the suspension for a few hours, a small fraction of the UCNPs were observed to be dispersed in the NMF solution (with a larger fraction remaining aggregated). The aggregated UCNPs were then removed by centrifugation, leaving a supernatant of colloidally dispersed, Sn2S6 4--capped UCNPs.