title: Consolidating molecular AND logic with two chemical inputs.
abstract: A novel molecular AND logic gate 1 is demonstrated based on the competition between fluorescence and photoinduced electron transfer (PET). It is constructed according to a 'receptor2-spacer-fluorophore-spacer-receptor1-spacer-fluorophore-spacer-receptor2' format where receptor1 is a tertiary amine, receptor2 is a benzo-15-crown-5 ether and the fluorophore is an anthracene moiety, which are separated from each other by methylene spacers. The fluorescence response in methanol is significantly enhanced only when both H+ and Na+ are the inputs at high enough concentrations in accordance with AND logic. Cs+ behaves similarly to Na+, but with a lower fluorescence enhancement, whereas the other alkali metal cations are not effective. Electrospray ionization mass spectrometry provides evidence for formation of 1:1 and 1:2 (1:metal) complexes with alkali cations, and formation of a 1:2:1 (1:metal:proton) complex in the additional presence of acid.
authors.affiliation: School of Chemistry and Chemical Engineering, Queen's University, Belfast BT9 5AG, Northern Ireland, UK. d.magri@qub.ac.uk
authors.forename: David C
authors.initials: DC
authors.lastname: Magri
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Coen
authors.forename: Robert L
authors.initials: RL
authors.lastname: Boyd
authors.forename: A Prasanna
authors.initials: AP
authors.lastname: de Silva