Salt formation by milling. TBZ salts were prepared by mixing 1 mmol of TBZ and each co-former into a stainlesssteel milling canister with one 4.0 g stainless steel ball bearing. The mixtures were milled at 30 Hz for 60 minutes. For the liquid-assisted grinding (LAG) experiments and considering η-value=0.2 (µL solvent/mg samples), a suitable amount of solvent (water, ethanol, methanol, dimethyl carbonate, acetonitrile, and ethyl acetate) was added to the canisters before milling. The samples were dried under vacuum using a Schlenk line at 80 °C for 24 h. The procedure was the same for 1:1 binary phase mixtures (TBZ-acid X/TBZ-acid Y).