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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 E→Z 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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Qu et al. (2005) studied this question.
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