Multiple logical access with a single fluorophore-spacer-receptor system: Realization of inhibit (INH) logic function

Abstract

A new fluorescent PET sensor (1) has been synthesized, the fluorescence of which switches "On" with a blue-to-green color change in the presence of Zn2+, Cd2+, or Pb2+ (OR logic). X-ray structure analyses of 1 and its Zn2+ complex reveal that the solid-state conformation is in accordance with the results observed in solution. Sensor 1 also acts as an "Off-On-Off" switch stimulated by protons. The H+-driven "Off-On-Off" switch is integrated with a Zn2+-, Cd2+-, or Pb2+-induced OR logic gate to construct a first INH logic gate employing these ionic inputs. © Wiley-VCH Verlag GmbH & Co. KGaA, 2005.