Dinuclear [M₂L₂]ⁿ⁺ (M = Pd²⁺ or Pt²⁺) metallo-rectangles have a rich history, particularly in molecular recognition, including self-catenation events. These structures are mostly generated via a ligand-directed approach with cis-capped M²⁺ corners. We report here a symmetry interaction approach using 3 : 1 complementary denticity, giving a new route to [M₂L₂]⁴⁺ rectangles and their self-catenation.