Fig. 3. Calculated geometries of the most stable structures of the [ArB₃O₄]⁺, [ArB₃O₅]⁺, [ArB₄O₆]⁺ and [ArB₅O₇]⁺ cation complexes and the bare [B₃O₄]⁺, [B₃O₅]⁺, [B₄O₆]⁺ and [B₅O₇]⁺ cations at the CCSD(T)/cc-pVTZ level of theory. The bond lengths are in angstroms and the bond angles are in degrees.