Triangular cationic belts [Au₃{PPh₂(C ₆H₄)_nPPh₂}₃] ³⁺ enclose bimetallic clusters [Au_wAg_x(C ₂Ph)_yX_z] in molecular aggregates obtained by halide (X)-directed assembly of multicomponent systems. The largest aggregate consists of a central metal alkynyl halide cluster [Au₁₈Ag ₃₀(C₂Ph)₃₆Cl₉]³⁺ inside a [Au₃{PPh₂(C₆H₄)₅PPh ₂}₃]³⁺ belt and comprises 51 metal atoms (see picture; Ag green, Au yellow, Cl violet, P red).