TY - JOUR A1 - Rurack, Knut A1 - Trieflinger, C. A1 - Kovalchuck, Anton V. A1 - Daub, J. T1 - An ionically driven molecular IMPLICATION gate operating in fluorescence Mode JF - Chemistry - A European journal N2 - An asymmetrically core-extended boron-dipyrromethene (BDP) dye was equipped with two electron-donating macrocyclic binding units with different metal ion preferences to operate as an ionically driven molecular IMPLICATION gate. A Na+-responsive tetraoxa-aza crown ether (R2) was integrated into the extended π system of the BDP chromophore to trigger strong intramolecular charge transfer (ICT2) fluorescence and guarantee cation-induced spectral shifts in absorption. A dithia-oxa-aza crown (R1) that responds to Ag+ was attached to the meso position of BDP in an electronically decoupled fashion to independently control a second ICT1 process of a quenching nature. The bifunctional molecule is designed in such a way that in the absence of both inputs, ICT1 does not compete with ICT2 and a high fluorescence output is obtained (InA=InB=0→Out=1). Accordingly, binding of only Ag+ at R1 (InA=1, InB=0) as well as complexation of both receptors (InA=InB=1) also yields Out=1. Only for the case in which Na+ is bound at R2 and R1 is in its free state does quenching occur, which is the distinguishing characteristic for the InA=0 and InB=1→Out=0 state that is required for a logic IMPLICATION gate and Boolean operations such as IF-THEN or NOT. KW - Charge transfer KW - Dyes/pigments KW - Fluorescence KW - Logic gates KW - Molecular devices PY - 2007 DO - https://doi.org/10.1002/chem.200700858 SN - 0947-6539 SN - 1521-3765 VL - 13 IS - 32 SP - 8998 EP - 9003 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-16085 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -