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A Half Adder Based on a Photochemically Driven [2]Rotaxane

Authors

  • Da-Hui Qu,

    1. Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P.R. China, Fax: (+86) 21-6425-2288
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  • Qiao-Chun Wang Dr.,

    1. Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P.R. China, Fax: (+86) 21-6425-2288
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  • He Tian Prof. Dr.

    1. Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P.R. China, Fax: (+86) 21-6425-2288
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  • H.T. acknowledges the support of the NSFC/China (20273020, 90401026) and the Education Committee of Shanghai. We thank Prof. A. Prasanna de Silva (Queen's University) for his valuable comments and suggestions. A half adder is a logic circuit that performs one-digit addition.

Abstract

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A molecular abacus: In a [2]rotaxane that mimicks a half adder with distinct AND and XOR logic gates, all the inputs (I) and outputs (O) are photochemical (see scheme; F=fluorescence, A=absorbance). Reversible EZ photoisomerization about two double bonds (shown in red and dark blue) in the thread molecule leads to four conformers that have different spectral properties.

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