Previously, we explored the use of ionic liquids (ILs) as precursors for metal complexes including CPs. We synthesized organometallic ILs with the formula [RuCp(arene)]X (Cp = C5H5, X = anion), which formed CPs upon UV photoirradiation. The use of cyanoborate anions in these ILs proved particularly advantageous. Recently, we found that UV photoirradiation of ILs [RuCp(C6H6)]BR(CN)3 (R = alkyl group) produces tetraalkyl cubanetype Ru complexes (Fig. ). In this reaction, UV irradiation triggered arene ligand dissociation, followed by Ru coordination with the BR(CN)3 anion.