Design, Prepare And Realization Of Molecule Logic Devices Simulated By Porphyrin And Fluorescein Derivative

Since the concept of Boolean logic of molecular logic has been depicted, lots ofefforts has been carried out and achieved viarious of developments due to itsadvantagements over traditional electronic device. They appear at that we can firelydesign molecular with special structure to achieve aim logic function, we can alsofunctionally integrate these molecular logic via self-asssembling process et al.Molecular logic device achieves lots of considerable results at different aspects, eg:elementary arithmetic, key-pad lock, and coder-decoder et al.Based on the function of logic device, it can be categorized into two types:combinational logic device and sequential logic device. During processing, the laterone different from the former one needs to take operational history or outputs inconsideration, like the functions of memory. Herein, we design and synthesiscorresponding porphyrin and fluorescein derivatives to mimic these two types oflogic device.1. Here, an asymmetric porphyrin derivative of5-(4-aminophenyl)-10,15,20-triphenyl-porphyrin (H2ATPP) has been successfully covalently connected tophoto-permeable mesoporous silica thin films as a unit to mimic logic function. Thishybrid mesoporous structure is not only advantageous to the interaction between inputs and response materials, but also to separation of the response materials andinputs without information lost. Then several molecular logics with the function ofmemory, based on its characteristic of being sensitive to acid and base, are achieved.With different initial states, it could be handily described as feedback loop andRS-latch for sequential logic.2, Afluorescein derivative named fluorescein hydrizido4-imidophenol (FHP) hasbeen designed to build a molecular logic device. The device is composed of two parts:lock-part and calculate-part. In this derivative, fluorescein is reffered to ascalculate-part owing to it was previously adopted to mimic calculator. And the restportion of this derivative is reffered to as lock-part. The operational principle of thisdevice is that if input combination is optimal, calculate-part fluorescein is releasedand ready for calculating; if not, calculate-part remains locked. It effectively improvesthe security of calculator simulated by molecular logic. In addition, lock-part will betotally destroyed like self-distruction under a special input combination, resulting inthat calculate-part can’t be unlocked at all events. Hence, it’s more sufficient to makebrute-force attack on this device unrealistic.