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
Date 2006
Volume 568
Issue 1-2
Start page 156
End page 160
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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