The invention concerns an electrochrome system comprising a mixture of reducible and oxidizable substances RED1 and OX2, at lest one RED1′-OX2′ pair being covalently interlinked via a bridge and, for at least one RED1″ or OX2″ substance, the reciprocal conversion of the oxidized form and the reduced form being brought about by the fracture or formation of a &sgr;-bond. The electrochrome system is characterized by simplified electron transfer and reduced secondary reactions.