Consolidating molecular AND logic with two chemical ...
|Title||Consolidating molecular AND logic with two chemical inputs|
|Author(s)||D. C. Magri, G. D. Coen, R. L. Boyd, A. P. de Silva|
|Journal||Analytica Chimica Acta|
|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 'receptor(2)-spacer-fluorophore-spacer-receptor(1)-spacer-fluorophore-sp acer-receptor(2)' format where receptor, is a tertiary amine, receptor(2) 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. (c) 2005 Elsevier B.V. All rights reserved.|
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