Signal communication between molecular switches

[GRAPHICS] Efficient strategies for the communication of signals between molecules mus t be identified for the development of molecule-based nanoprocessors. We ha ve demonstrated that photoinduced proton transfer can be exploited to imple ment intermolecular digital transmission. Light inputs operate a three-stat e molecular switch inducing the transfer of a proton to or from a two-state molecular switch. The signal transduction protocol of the two communicatin g molecular switches is equivalent to that of a sequential logic circuit in corporating three logic gates.