For example, the chloride ligands of aluminium chloride bridge two aluminium centers, thus the compound with the empirical formula AlCl3 actually has the molecular formula of Al2Cl6 under ordinary conditions.
Foreksempel er klorliganderne fra aluminiumchloride binder til to aluminiumcentre, sådan at stoffet har den emperiske formel AlCl3 faktisk har molekylformlen Al2Cl6 under normale forhold.