- Metal Center: Different metals have varying abilities to form Ï complexes. Transition metals like palladium, platinum, and rhodium are particularly effective. - Ligands: The nature of the ligands attached to the metal center can influence the strength and stability of the Ï complex. Electron-donating ligands can enhance Ï complexation. - Substrate: The type of Ï system (e.g., alkene, alkyne, or aromatic ring) and its substituents can impact the interaction. Electron-rich Ï systems generally form stronger complexes.