Fluorescent Molecular Logic Gates Driven by Temperature and by Protons in Solution and on Solid

Abstract Temperature‐driven fluorescent NOT logic is demonstrated by exploiting predissociation in a 1,3,5‐trisubstituted Δ 2 ‐pyrazoline on its own and when grafted onto silica microparticles. Related Δ 2 ‐pyrazolines become proton‐driven YES and NOT logic gates on the basis of fluorescent photoinduced electron transfer (PET) switches. Additional PASS 1 and YES+PASS 1 logic gates on silica are also demonstrated within the same family. Beside these small‐molecule systems, a polymeric molecular thermometer based on a benzofurazan‐derivatized N ‐isopropylacrylamide copolymer is attached to silica to produce temperature‐driven fluorescent YES logic.