Intermolecular and intramolecular logic gates

Logic circuits operating on different molecules or on different parts of th e same molecule can be connected. As an example, a circuit known as a full adder is described. It is made up of two circuits, a half adder on a donor (rhodamine 6G) and another half adder on an acceptor (azulene). The signal, (an intermediate sum), is moved from donor to acceptor by electronic energ y transfer. The concatenated logic arrangement is described, and potential applications using other bichromophoric molecules are outlined. Polychromop horic molecules will allow a fanout operation.